how to connect 2 nodes to a SCSI disk (cabinet)

how to connect 2 nodes to a SCSI disk (cabinet)

[Ranade, Prakash]

we have 2 servers running redhat linux and a external SCSI disk (cabinet). we want to connect this scsi disk to 2 servers we have for oracle parallel server installation
i tried connecting both of them simultaneously to the scsi but it fails ....I can connect only one at a time .....anyone used it like this for Oracle Parallel Server ....

Let me know if you need anymore info

Prakash S. Ranade
OCP - Oracle Certified DBA 8i, 9i
205 776 2320

"Lets document it and call it a feature"

Re: how to connect 2 nodes to a SCSI disk (cabinet)

[Mike Dresser]

On Fri, 20 Jun 2003, Ranade, Prakash wrote:

> we have 2 servers running redhat linux and a external SCSI disk
> (cabinet). we want to connect this scsi disk to 2 servers we have for
> oracle parallel server installation i tried connecting both of them
> simultaneously to the scsi but it fails ....I can connect only one at
> a time .....anyone used it like this for Oracle Parallel Server ....
>
> Let me know if you need anymore info

I assume you're handing filesystem contention somehow.

But anyways, check that you've changed the SCSI ID on a controller to
something besides 7.  The default SCSI ID on a controller is 7, and if
you have the two of them on that, they will conflict.

Mike

RE: how to connect 2 nodes to a SCSI disk (cabinet)

[Ranade, Prakash]

well i did change it to 14 and 15...but it seems that there is a conflict between 2 nodes on using same scsi drive. The interfaces are fighting over the bus.. They both kept resetting the drive.
any idea......
Prakash S. Ranade
OCP - Oracle Certified DBA 8i, 9i
205 776 2320

"Lets document it and call it a feature"


-----Original Message-----
From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
Sent: Friday, June 20, 2003 11:04 AM
To: Ranade, Prakash
Cc: linux-scsi@vger.kernel.org
Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)


On Fri, 20 Jun 2003, Ranade, Prakash wrote:

> we have 2 servers running redhat linux and a external SCSI disk
> (cabinet). we want to connect this scsi disk to 2 servers we have for
> oracle parallel server installation i tried connecting both of them
> simultaneously to the scsi but it fails ....I can connect only one at
> a time .....anyone used it like this for Oracle Parallel Server ....
>
> Let me know if you need anymore info

I assume you're handing filesystem contention somehow.

But anyways, check that you've changed the SCSI ID on a controller to
something besides 7.  The default SCSI ID on a controller is 7, and if
you have the two of them on that, they will conflict.

Mike

RE: how to connect 2 nodes to a SCSI disk (cabinet)

[Mike Dresser]

On Fri, 20 Jun 2003, Ranade, Prakash wrote:

> well i did change it to 14 and 15...but it seems that there is a
> conflict between 2 nodes on using same scsi drive. The interfaces are
> fighting over the bus.. They both kept resetting the drive. any
> idea......

Ok, lay out how you've got the systems cabled, both internally and
external.

Disk type and controller type would be good too.

Mike

RE: how to connect 2 nodes to a SCSI disk (cabinet)

[Mike Dresser]

On Fri, 20 Jun 2003, Ranade, Prakash wrote:

> node1 and node2 both running redhat linux 7.2...both have Adaptec scsi card in it...scsi disk is  DataSilo DS-100 (see attached manual) using Seagate HD.
> node1:scsi id = 14 - scsi termination is disabled
> node1:scsi id = 15 - scsi termination is automatic (i tried all enabled/disabled/automatic nothing works)
> external scsi disk id = 0
>
> node 1 							node 2
> 	|							|
> 	|							|
> 	---------external SCSI drive---------------
>

Any internal connections on either SCSI card?

If not, set both node's to enabled scsi termination.

Mike

RE: how to connect 2 nodes to a SCSI disk (cabinet)

[Ranade, Prakash]

but how does it work then ...coz there is no termination ....

Prakash S. Ranade
OCP - Oracle Certified DBA 8i, 9i
205 776 2320

"Lets document it and call it a feature"


-----Original Message-----
From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
Sent: Friday, June 20, 2003 11:57 AM
To: Ranade, Prakash
Cc: linux-scsi@vger.kernel.org
Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)




On Fri, 20 Jun 2003, Ranade, Prakash wrote:

> node1 and node2 both running redhat linux 7.2...both have Adaptec scsi card in it...scsi disk is  DataSilo DS-100 (see attached manual) using Seagate HD.
> node1:scsi id = 14 - scsi termination is disabled
> node1:scsi id = 15 - scsi termination is automatic (i tried all enabled/disabled/automatic nothing works)
> external scsi disk id = 0
>
> node 1 							node 2
> 	|							|
> 	|							|
> 	---------external SCSI drive---------------
>

Any internal connections on either SCSI card?

If not, set both node's to enabled scsi termination.

Mike

RE: how to connect 2 nodes to a SCSI disk (cabinet)

[Ranade, Prakash]

isent it true that...
you cannot have two seperate SCSI controllers trying to maintain the same bus.They will fight..for same bus?

Prakash S. Ranade
OCP - Oracle Certified DBA 8i, 9i
205 776 2320

"Lets document it and call it a feature"


-----Original Message-----
From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
Sent: Friday, June 20, 2003 11:57 AM
To: Ranade, Prakash
Cc: linux-scsi@vger.kernel.org
Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)




On Fri, 20 Jun 2003, Ranade, Prakash wrote:

> node1 and node2 both running redhat linux 7.2...both have Adaptec scsi card in it...scsi disk is  DataSilo DS-100 (see attached manual) using Seagate HD.
> node1:scsi id = 14 - scsi termination is disabled
> node1:scsi id = 15 - scsi termination is automatic (i tried all enabled/disabled/automatic nothing works)
> external scsi disk id = 0
>
> node 1 							node 2
> 	|							|
> 	|							|
> 	---------external SCSI drive---------------
>

Any internal connections on either SCSI card?

If not, set both node's to enabled scsi termination.

Mike

RE: how to connect 2 nodes to a SCSI disk (cabinet)

[Mike Dresser]

On Fri, 20 Jun 2003, Ranade, Prakash wrote:

> isent it true that...
> you cannot have two seperate SCSI controllers trying to maintain the same bus.They will fight..for same bus?

You can have multiple controllers on the same bus.

As for the termination question, you only terminate at the ends.  So if
you have  Card - Storage - Card, you need to set the termination to
enabled on both cards.

If you had InternalDrive - Card - Storage - Card, you'd set the
termination on the internaldrive(which would normally be done with the
cableing there), and then on the Card on the other end, but the first card
would not have termination set at all.

Mike

RE: how to connect 2 nodes to a SCSI disk (cabinet)

[jansen, frank]

This is fairly old technology, so I'll have to go back in my memory banks,
but here are my recollections on setting this up:

- Change the topology so that there is no termination on either HBA and use
Y-cables with external termination, so that you can unplug either host from
the bus without taking down access for the other host.  The topology will
look as follows:

    T   _______external SCSI driver______________   T
     \ /                                         \ /
      Y                                           Y
   node 1 							node 2

The other option is to leave termination on both HBAs, inwhich case you
should never unplug anything.  Note that the bus must be arbitrated on both
ends.  Also be sure not to violate any length limits on your SCSI bus.
- ID settings: set one HBA to 7 and the other to 6.  The reason for these
numbers is that the arbitration scheme for SCSI runs 7 down to 0 to 15 down
to 8.  In your current configuration the disk has a higher arbitration
priority than the HBAs.
- Disable bus erset on power up on both HBAs; this will ensure that you can
power either host without clearing all outstanding requests on the bus.

If none of your pins are bent anywhere, this should work for sharing a
device.  Now you'll get to the fun part of 2 hosts coordinating access to a
single device.

Good luck,

Frank

-----Original Message-----
From: Ranade, Prakash [mailto:prakashr@intgroup.com]
Sent: Friday, June 20, 2003 1:01 PM
To: Mike Dresser
Cc: linux-scsi@vger.kernel.org
Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)


isent it true that...
you cannot have two seperate SCSI controllers trying to maintain the same
bus.They will fight..for same bus?

Prakash S. Ranade
OCP - Oracle Certified DBA 8i, 9i
205 776 2320

"Lets document it and call it a feature"


-----Original Message-----
From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
Sent: Friday, June 20, 2003 11:57 AM
To: Ranade, Prakash
Cc: linux-scsi@vger.kernel.org
Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)




On Fri, 20 Jun 2003, Ranade, Prakash wrote:

> node1 and node2 both running redhat linux 7.2...both have Adaptec scsi
card in it...scsi disk is  DataSilo DS-100 (see attached manual) using
Seagate HD.
> node1:scsi id = 14 - scsi termination is disabled
> node1:scsi id = 15 - scsi termination is automatic (i tried all
enabled/disabled/automatic nothing works)
> external scsi disk id = 0
>
> node 1 							node 2
> 	|							|
> 	|							|
> 	---------external SCSI drive---------------
>

Any internal connections on either SCSI card?

If not, set both node's to enabled scsi termination.

Mike

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To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
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Re: how to connect 2 nodes to a SCSI disk (cabinet)

[Eddie Williams]

Depending on which adaptec card you are using you may need to set a jumper to 
force termination.  Some of the older Adaptec cards have "soft" termination.  
Meaning, when power is applied it will drive termination but when power is 
dropped termination is dropped.  For those cards setting a jumper will force 
termination even when the power is removed.  This is pretty important if you 
power off one server.

It is probably safe to assume other wise but just to be sure, this is not a 
dual ported SCSI drive is it?  If so then it is not really a shared bus and 
in that case the drive would need to terminate both busses.

I agree with Frank here, you want the hosts at 7 and 6.

If you power the servers up one at a time can they see the drive OK?  Start 
simple.

Eddie
On Friday 20 June 2003 01:49 pm, jansen, frank wrote:
> This is fairly old technology, so I'll have to go back in my memory banks,
> but here are my recollections on setting this up:
>
> - Change the topology so that there is no termination on either HBA and use
> Y-cables with external termination, so that you can unplug either host from
> the bus without taking down access for the other host.  The topology will
> look as follows:
>
>     T   _______external SCSI driver______________   T
>      \ /                                         \ /
>       Y                                           Y
>    node 1 							node 2
>
> The other option is to leave termination on both HBAs, inwhich case you
> should never unplug anything.  Note that the bus must be arbitrated on both
> ends.  Also be sure not to violate any length limits on your SCSI bus.
> - ID settings: set one HBA to 7 and the other to 6.  The reason for these
> numbers is that the arbitration scheme for SCSI runs 7 down to 0 to 15 down
> to 8.  In your current configuration the disk has a higher arbitration
> priority than the HBAs.
> - Disable bus erset on power up on both HBAs; this will ensure that you can
> power either host without clearing all outstanding requests on the bus.
>
> If none of your pins are bent anywhere, this should work for sharing a
> device.  Now you'll get to the fun part of 2 hosts coordinating access to a
> single device.
>
> Good luck,
>
> Frank
>
> -----Original Message-----
> From: Ranade, Prakash [mailto:prakashr@intgroup.com]
> Sent: Friday, June 20, 2003 1:01 PM
> To: Mike Dresser
> Cc: linux-scsi@vger.kernel.org
> Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
>
>
> isent it true that...
> you cannot have two seperate SCSI controllers trying to maintain the same
> bus.They will fight..for same bus?
>
> Prakash S. Ranade
> OCP - Oracle Certified DBA 8i, 9i
> 205 776 2320
>
> "Lets document it and call it a feature"
>
>
> -----Original Message-----
> From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
> Sent: Friday, June 20, 2003 11:57 AM
> To: Ranade, Prakash
> Cc: linux-scsi@vger.kernel.org
> Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
>
> On Fri, 20 Jun 2003, Ranade, Prakash wrote:
> > node1 and node2 both running redhat linux 7.2...both have Adaptec scsi
>
> card in it...scsi disk is  DataSilo DS-100 (see attached manual) using
> Seagate HD.
>
> > node1:scsi id = 14 - scsi termination is disabled
> > node1:scsi id = 15 - scsi termination is automatic (i tried all
>
> enabled/disabled/automatic nothing works)
>
> > external scsi disk id = 0
> >
> > node 1 							node 2
> >
> >
> > 	---------external SCSI drive---------------
>
> Any internal connections on either SCSI card?
>
> If not, set both node's to enabled scsi termination.
>
> Mike
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> -
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

RE: how to connect 2 nodes to a SCSI disk (cabinet)

[Ranade, Prakash]

The linux driver is going to send a bus reset when it initializes the interfaces. Still will not solve all of our problems.....am i right?

Prakash S. Ranade
OCP - Oracle Certified DBA 8i, 9i
205 776 2320

"Lets document it and call it a feature"


-----Original Message-----
From: jansen, frank [mailto:jansen_frank@emc.com]
Sent: Friday, June 20, 2003 12:49 PM
To: Ranade, Prakash; Mike Dresser
Cc: linux-scsi@vger.kernel.org
Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)


This is fairly old technology, so I'll have to go back in my memory banks,
but here are my recollections on setting this up:

- Change the topology so that there is no termination on either HBA and use
Y-cables with external termination, so that you can unplug either host from
the bus without taking down access for the other host.  The topology will
look as follows:

    T   _______external SCSI driver______________   T
     \ /                                         \ /
      Y                                           Y
   node 1 							node 2

The other option is to leave termination on both HBAs, inwhich case you
should never unplug anything.  Note that the bus must be arbitrated on both
ends.  Also be sure not to violate any length limits on your SCSI bus.
- ID settings: set one HBA to 7 and the other to 6.  The reason for these
numbers is that the arbitration scheme for SCSI runs 7 down to 0 to 15 down
to 8.  In your current configuration the disk has a higher arbitration
priority than the HBAs.
- Disable bus erset on power up on both HBAs; this will ensure that you can
power either host without clearing all outstanding requests on the bus.

If none of your pins are bent anywhere, this should work for sharing a
device.  Now you'll get to the fun part of 2 hosts coordinating access to a
single device.

Good luck,

Frank

-----Original Message-----
From: Ranade, Prakash [mailto:prakashr@intgroup.com]
Sent: Friday, June 20, 2003 1:01 PM
To: Mike Dresser
Cc: linux-scsi@vger.kernel.org
Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)


isent it true that...
you cannot have two seperate SCSI controllers trying to maintain the same
bus.They will fight..for same bus?

Prakash S. Ranade
OCP - Oracle Certified DBA 8i, 9i
205 776 2320

"Lets document it and call it a feature"


-----Original Message-----
From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
Sent: Friday, June 20, 2003 11:57 AM
To: Ranade, Prakash
Cc: linux-scsi@vger.kernel.org
Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)




On Fri, 20 Jun 2003, Ranade, Prakash wrote:

> node1 and node2 both running redhat linux 7.2...both have Adaptec scsi
card in it...scsi disk is  DataSilo DS-100 (see attached manual) using
Seagate HD.
> node1:scsi id = 14 - scsi termination is disabled
> node1:scsi id = 15 - scsi termination is automatic (i tried all
enabled/disabled/automatic nothing works)
> external scsi disk id = 0
>
> node 1 							node 2
> 	|							|
> 	|							|
> 	---------external SCSI drive---------------
>

Any internal connections on either SCSI card?

If not, set both node's to enabled scsi termination.

Mike

-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

RE: how to connect 2 nodes to a SCSI disk (cabinet)

[Ranade, Prakash]

yes they can see the drive but there is a conflict when they try to initialize the bus...

Prakash S. Ranade
OCP - Oracle Certified DBA 8i, 9i
205 776 2320

"Lets document it and call it a feature"


-----Original Message-----
From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
Sent: Friday, June 20, 2003 1:26 PM
To: jansen, frank; Ranade, Prakash; Mike Dresser
Cc: linux-scsi@vger.kernel.org
Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)



Depending on which adaptec card you are using you may need to set a jumper to 
force termination.  Some of the older Adaptec cards have "soft" termination.  
Meaning, when power is applied it will drive termination but when power is 
dropped termination is dropped.  For those cards setting a jumper will force 
termination even when the power is removed.  This is pretty important if you 
power off one server.

It is probably safe to assume other wise but just to be sure, this is not a 
dual ported SCSI drive is it?  If so then it is not really a shared bus and 
in that case the drive would need to terminate both busses.

I agree with Frank here, you want the hosts at 7 and 6.

If you power the servers up one at a time can they see the drive OK?  Start 
simple.

Eddie
On Friday 20 June 2003 01:49 pm, jansen, frank wrote:
> This is fairly old technology, so I'll have to go back in my memory banks,
> but here are my recollections on setting this up:
>
> - Change the topology so that there is no termination on either HBA and use
> Y-cables with external termination, so that you can unplug either host from
> the bus without taking down access for the other host.  The topology will
> look as follows:
>
>     T   _______external SCSI driver______________   T
>      \ /                                         \ /
>       Y                                           Y
>    node 1 							node 2
>
> The other option is to leave termination on both HBAs, inwhich case you
> should never unplug anything.  Note that the bus must be arbitrated on both
> ends.  Also be sure not to violate any length limits on your SCSI bus.
> - ID settings: set one HBA to 7 and the other to 6.  The reason for these
> numbers is that the arbitration scheme for SCSI runs 7 down to 0 to 15 down
> to 8.  In your current configuration the disk has a higher arbitration
> priority than the HBAs.
> - Disable bus erset on power up on both HBAs; this will ensure that you can
> power either host without clearing all outstanding requests on the bus.
>
> If none of your pins are bent anywhere, this should work for sharing a
> device.  Now you'll get to the fun part of 2 hosts coordinating access to a
> single device.
>
> Good luck,
>
> Frank
>
> -----Original Message-----
> From: Ranade, Prakash [mailto:prakashr@intgroup.com]
> Sent: Friday, June 20, 2003 1:01 PM
> To: Mike Dresser
> Cc: linux-scsi@vger.kernel.org
> Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
>
>
> isent it true that...
> you cannot have two seperate SCSI controllers trying to maintain the same
> bus.They will fight..for same bus?
>
> Prakash S. Ranade
> OCP - Oracle Certified DBA 8i, 9i
> 205 776 2320
>
> "Lets document it and call it a feature"
>
>
> -----Original Message-----
> From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
> Sent: Friday, June 20, 2003 11:57 AM
> To: Ranade, Prakash
> Cc: linux-scsi@vger.kernel.org
> Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
>
> On Fri, 20 Jun 2003, Ranade, Prakash wrote:
> > node1 and node2 both running redhat linux 7.2...both have Adaptec scsi
>
> card in it...scsi disk is  DataSilo DS-100 (see attached manual) using
> Seagate HD.
>
> > node1:scsi id = 14 - scsi termination is disabled
> > node1:scsi id = 15 - scsi termination is automatic (i tried all
>
> enabled/disabled/automatic nothing works)
>
> > external scsi disk id = 0
> >
> > node 1 							node 2
> >
> >
> > 	---------external SCSI drive---------------
>
> Any internal connections on either SCSI card?
>
> If not, set both node's to enabled scsi termination.
>
> Mike
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> -
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: how to connect 2 nodes to a SCSI disk (cabinet)

[Eddie Williams]

Please define "there is a conflict when they try to initialize the bus."

Do you have a SCSI analyzer seeing some conflict?
When you boot them both up, one or both hang?
One or the other can not read the fdisk when they boot?


Eddie

On Friday 20 June 2003 02:55 pm, Ranade, Prakash wrote:
> yes they can see the drive but there is a conflict when they try to
> initialize the bus...
>
> Prakash S. Ranade
> OCP - Oracle Certified DBA 8i, 9i
> 205 776 2320
>
> "Lets document it and call it a feature"
>
>
> -----Original Message-----
> From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
> Sent: Friday, June 20, 2003 1:26 PM
> To: jansen, frank; Ranade, Prakash; Mike Dresser
> Cc: linux-scsi@vger.kernel.org
> Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
>
>
>
> Depending on which adaptec card you are using you may need to set a jumper
> to force termination.  Some of the older Adaptec cards have "soft"
> termination. Meaning, when power is applied it will drive termination but
> when power is dropped termination is dropped.  For those cards setting a
> jumper will force termination even when the power is removed.  This is
> pretty important if you power off one server.
>
> It is probably safe to assume other wise but just to be sure, this is not a
> dual ported SCSI drive is it?  If so then it is not really a shared bus and
> in that case the drive would need to terminate both busses.
>
> I agree with Frank here, you want the hosts at 7 and 6.
>
> If you power the servers up one at a time can they see the drive OK?  Start
> simple.
>
> Eddie
>
> On Friday 20 June 2003 01:49 pm, jansen, frank wrote:
> > This is fairly old technology, so I'll have to go back in my memory
> > banks, but here are my recollections on setting this up:
> >
> > - Change the topology so that there is no termination on either HBA and
> > use Y-cables with external termination, so that you can unplug either
> > host from the bus without taking down access for the other host.  The
> > topology will look as follows:
> >
> >     T   _______external SCSI driver______________   T
> >      \ /                                         \ /
> >       Y                                           Y
> >    node 1 							node 2
> >
> > The other option is to leave termination on both HBAs, inwhich case you
> > should never unplug anything.  Note that the bus must be arbitrated on
> > both ends.  Also be sure not to violate any length limits on your SCSI
> > bus. - ID settings: set one HBA to 7 and the other to 6.  The reason for
> > these numbers is that the arbitration scheme for SCSI runs 7 down to 0 to
> > 15 down to 8.  In your current configuration the disk has a higher
> > arbitration priority than the HBAs.
> > - Disable bus erset on power up on both HBAs; this will ensure that you
> > can power either host without clearing all outstanding requests on the
> > bus.
> >
> > If none of your pins are bent anywhere, this should work for sharing a
> > device.  Now you'll get to the fun part of 2 hosts coordinating access to
> > a single device.
> >
> > Good luck,
> >
> > Frank
> >
> > -----Original Message-----
> > From: Ranade, Prakash [mailto:prakashr@intgroup.com]
> > Sent: Friday, June 20, 2003 1:01 PM
> > To: Mike Dresser
> > Cc: linux-scsi@vger.kernel.org
> > Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
> >
> >
> > isent it true that...
> > you cannot have two seperate SCSI controllers trying to maintain the same
> > bus.They will fight..for same bus?
> >
> > Prakash S. Ranade
> > OCP - Oracle Certified DBA 8i, 9i
> > 205 776 2320
> >
> > "Lets document it and call it a feature"
> >
> >
> > -----Original Message-----
> > From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
> > Sent: Friday, June 20, 2003 11:57 AM
> > To: Ranade, Prakash
> > Cc: linux-scsi@vger.kernel.org
> > Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
> >
> > On Fri, 20 Jun 2003, Ranade, Prakash wrote:
> > > node1 and node2 both running redhat linux 7.2...both have Adaptec scsi
> >
> > card in it...scsi disk is  DataSilo DS-100 (see attached manual) using
> > Seagate HD.
> >
> > > node1:scsi id = 14 - scsi termination is disabled
> > > node1:scsi id = 15 - scsi termination is automatic (i tried all
> >
> > enabled/disabled/automatic nothing works)
> >
> > > external scsi disk id = 0
> > >
> > > node 1 							node 2
> > >
> > >
> > > 	---------external SCSI drive---------------
> >
> > Any internal connections on either SCSI card?
> >
> > If not, set both node's to enabled scsi termination.
> >
> > Mike
> >
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html

RE: how to connect 2 nodes to a SCSI disk (cabinet)

[Ranade, Prakash]

both hang at boot time...they both try to initialize the device and hang.....
if i boot node1 without starting node2 then node1 boots up but then when i try to boot node2 then it keeps saying "someone initialized channel A"....

Prakash S. Ranade
OCP - Oracle Certified DBA 8i, 9i
205 776 2320

"Lets document it and call it a feature"


-----Original Message-----
From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
Sent: Friday, June 20, 2003 2:24 PM
To: Ranade, Prakash
Cc: linux-scsi@vger.kernel.org
Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)



Please define "there is a conflict when they try to initialize the bus."

Do you have a SCSI analyzer seeing some conflict?
When you boot them both up, one or both hang?
One or the other can not read the fdisk when they boot?


Eddie

On Friday 20 June 2003 02:55 pm, Ranade, Prakash wrote:
> yes they can see the drive but there is a conflict when they try to
> initialize the bus...
>
> Prakash S. Ranade
> OCP - Oracle Certified DBA 8i, 9i
> 205 776 2320
>
> "Lets document it and call it a feature"
>
>
> -----Original Message-----
> From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
> Sent: Friday, June 20, 2003 1:26 PM
> To: jansen, frank; Ranade, Prakash; Mike Dresser
> Cc: linux-scsi@vger.kernel.org
> Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
>
>
>
> Depending on which adaptec card you are using you may need to set a jumper
> to force termination.  Some of the older Adaptec cards have "soft"
> termination. Meaning, when power is applied it will drive termination but
> when power is dropped termination is dropped.  For those cards setting a
> jumper will force termination even when the power is removed.  This is
> pretty important if you power off one server.
>
> It is probably safe to assume other wise but just to be sure, this is not a
> dual ported SCSI drive is it?  If so then it is not really a shared bus and
> in that case the drive would need to terminate both busses.
>
> I agree with Frank here, you want the hosts at 7 and 6.
>
> If you power the servers up one at a time can they see the drive OK?  Start
> simple.
>
> Eddie
>
> On Friday 20 June 2003 01:49 pm, jansen, frank wrote:
> > This is fairly old technology, so I'll have to go back in my memory
> > banks, but here are my recollections on setting this up:
> >
> > - Change the topology so that there is no termination on either HBA and
> > use Y-cables with external termination, so that you can unplug either
> > host from the bus without taking down access for the other host.  The
> > topology will look as follows:
> >
> >     T   _______external SCSI driver______________   T
> >      \ /                                         \ /
> >       Y                                           Y
> >    node 1 							node 2
> >
> > The other option is to leave termination on both HBAs, inwhich case you
> > should never unplug anything.  Note that the bus must be arbitrated on
> > both ends.  Also be sure not to violate any length limits on your SCSI
> > bus. - ID settings: set one HBA to 7 and the other to 6.  The reason for
> > these numbers is that the arbitration scheme for SCSI runs 7 down to 0 to
> > 15 down to 8.  In your current configuration the disk has a higher
> > arbitration priority than the HBAs.
> > - Disable bus erset on power up on both HBAs; this will ensure that you
> > can power either host without clearing all outstanding requests on the
> > bus.
> >
> > If none of your pins are bent anywhere, this should work for sharing a
> > device.  Now you'll get to the fun part of 2 hosts coordinating access to
> > a single device.
> >
> > Good luck,
> >
> > Frank
> >
> > -----Original Message-----
> > From: Ranade, Prakash [mailto:prakashr@intgroup.com]
> > Sent: Friday, June 20, 2003 1:01 PM
> > To: Mike Dresser
> > Cc: linux-scsi@vger.kernel.org
> > Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
> >
> >
> > isent it true that...
> > you cannot have two seperate SCSI controllers trying to maintain the same
> > bus.They will fight..for same bus?
> >
> > Prakash S. Ranade
> > OCP - Oracle Certified DBA 8i, 9i
> > 205 776 2320
> >
> > "Lets document it and call it a feature"
> >
> >
> > -----Original Message-----
> > From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
> > Sent: Friday, June 20, 2003 11:57 AM
> > To: Ranade, Prakash
> > Cc: linux-scsi@vger.kernel.org
> > Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
> >
> > On Fri, 20 Jun 2003, Ranade, Prakash wrote:
> > > node1 and node2 both running redhat linux 7.2...both have Adaptec scsi
> >
> > card in it...scsi disk is  DataSilo DS-100 (see attached manual) using
> > Seagate HD.
> >
> > > node1:scsi id = 14 - scsi termination is disabled
> > > node1:scsi id = 15 - scsi termination is automatic (i tried all
> >
> > enabled/disabled/automatic nothing works)
> >
> > > external scsi disk id = 0
> > >
> > > node 1 							node 2
> > >
> > >
> > > 	---------external SCSI drive---------------
> >
> > Any internal connections on either SCSI card?
> >
> > If not, set both node's to enabled scsi termination.
> >
> > Mike
> >
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: how to connect 2 nodes to a SCSI disk (cabinet)

[Eddie Williams]

I take it this "someone initialized ..." message is coming from the BIOS?  I 
don't see anything like this in the SCSI driver source directory.

I have used both the aic7xxx new and old doing clustering so with those 
drivers and the cards they support I know it works.  If you are not using the 
aic7xxx driver then it may be that the driver is not honoring the initiator 
ID set in BIOS and so you have a conflict.

I don't see below where you say what specific adapter you are using?  

Eddie
On Friday 20 June 2003 03:32 pm, Ranade, Prakash wrote:
> both hang at boot time...they both try to initialize the device and
> hang..... if i boot node1 without starting node2 then node1 boots up but
> then when i try to boot node2 then it keeps saying "someone initialized
> channel A"....
>
> Prakash S. Ranade
> OCP - Oracle Certified DBA 8i, 9i
> 205 776 2320
>
> "Lets document it and call it a feature"
>
>
> -----Original Message-----
> From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
> Sent: Friday, June 20, 2003 2:24 PM
> To: Ranade, Prakash
> Cc: linux-scsi@vger.kernel.org
> Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
>
>
>
> Please define "there is a conflict when they try to initialize the bus."
>
> Do you have a SCSI analyzer seeing some conflict?
> When you boot them both up, one or both hang?
> One or the other can not read the fdisk when they boot?
>
>
> Eddie
>
> On Friday 20 June 2003 02:55 pm, Ranade, Prakash wrote:
> > yes they can see the drive but there is a conflict when they try to
> > initialize the bus...
> >
> > Prakash S. Ranade
> > OCP - Oracle Certified DBA 8i, 9i
> > 205 776 2320
> >
> > "Lets document it and call it a feature"
> >
> >
> > -----Original Message-----
> > From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
> > Sent: Friday, June 20, 2003 1:26 PM
> > To: jansen, frank; Ranade, Prakash; Mike Dresser
> > Cc: linux-scsi@vger.kernel.org
> > Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
> >
> >
> >
> > Depending on which adaptec card you are using you may need to set a
> > jumper to force termination.  Some of the older Adaptec cards have "soft"
> > termination. Meaning, when power is applied it will drive termination but
> > when power is dropped termination is dropped.  For those cards setting a
> > jumper will force termination even when the power is removed.  This is
> > pretty important if you power off one server.
> >
> > It is probably safe to assume other wise but just to be sure, this is not
> > a dual ported SCSI drive is it?  If so then it is not really a shared bus
> > and in that case the drive would need to terminate both busses.
> >
> > I agree with Frank here, you want the hosts at 7 and 6.
> >
> > If you power the servers up one at a time can they see the drive OK? 
> > Start simple.
> >
> > Eddie
> >
> > On Friday 20 June 2003 01:49 pm, jansen, frank wrote:
> > > This is fairly old technology, so I'll have to go back in my memory
> > > banks, but here are my recollections on setting this up:
> > >
> > > - Change the topology so that there is no termination on either HBA and
> > > use Y-cables with external termination, so that you can unplug either
> > > host from the bus without taking down access for the other host.  The
> > > topology will look as follows:
> > >
> > >     T   _______external SCSI driver______________   T
> > >      \ /                                         \ /
> > >       Y                                           Y
> > >    node 1 							node 2
> > >
> > > The other option is to leave termination on both HBAs, inwhich case you
> > > should never unplug anything.  Note that the bus must be arbitrated on
> > > both ends.  Also be sure not to violate any length limits on your SCSI
> > > bus. - ID settings: set one HBA to 7 and the other to 6.  The reason
> > > for these numbers is that the arbitration scheme for SCSI runs 7 down
> > > to 0 to 15 down to 8.  In your current configuration the disk has a
> > > higher arbitration priority than the HBAs.
> > > - Disable bus erset on power up on both HBAs; this will ensure that you
> > > can power either host without clearing all outstanding requests on the
> > > bus.
> > >
> > > If none of your pins are bent anywhere, this should work for sharing a
> > > device.  Now you'll get to the fun part of 2 hosts coordinating access
> > > to a single device.
> > >
> > > Good luck,
> > >
> > > Frank
> > >
> > > -----Original Message-----
> > > From: Ranade, Prakash [mailto:prakashr@intgroup.com]
> > > Sent: Friday, June 20, 2003 1:01 PM
> > > To: Mike Dresser
> > > Cc: linux-scsi@vger.kernel.org
> > > Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
> > >
> > >
> > > isent it true that...
> > > you cannot have two seperate SCSI controllers trying to maintain the
> > > same bus.They will fight..for same bus?
> > >
> > > Prakash S. Ranade
> > > OCP - Oracle Certified DBA 8i, 9i
> > > 205 776 2320
> > >
> > > "Lets document it and call it a feature"
> > >
> > >
> > > -----Original Message-----
> > > From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
> > > Sent: Friday, June 20, 2003 11:57 AM
> > > To: Ranade, Prakash
> > > Cc: linux-scsi@vger.kernel.org
> > > Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
> > >
> > > On Fri, 20 Jun 2003, Ranade, Prakash wrote:
> > > > node1 and node2 both running redhat linux 7.2...both have Adaptec
> > > > scsi
> > >
> > > card in it...scsi disk is  DataSilo DS-100 (see attached manual) using
> > > Seagate HD.
> > >
> > > > node1:scsi id = 14 - scsi termination is disabled
> > > > node1:scsi id = 15 - scsi termination is automatic (i tried all
> > >
> > > enabled/disabled/automatic nothing works)
> > >
> > > > external scsi disk id = 0
> > > >
> > > > node 1 							node 2
> > > >
> > > >
> > > > 	---------external SCSI drive---------------
> > >
> > > Any internal connections on either SCSI card?
> > >
> > > If not, set both node's to enabled scsi termination.
> > >
> > > Mike
> > >
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe linux-scsi"
> > > in the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe linux-scsi"
> > > in the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html

RE: how to connect 2 nodes to a SCSI disk (cabinet)

[Ranade, Prakash]

yes its the bios and i am using 

Adaptec AIC7xxx driver version: 6.2.8
aic7892: Ultra160 Wide Channel A, SCSI Id=14, 32/253 SCBs

Prakash S. Ranade
OCP - Oracle Certified DBA 8i, 9i
205 776 2320

"Lets document it and call it a feature"


-----Original Message-----
From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
Sent: Friday, June 20, 2003 3:00 PM
To: Ranade, Prakash
Cc: linux-scsi@vger.kernel.org
Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)



I take it this "someone initialized ..." message is coming from the BIOS?  I 
don't see anything like this in the SCSI driver source directory.

I have used both the aic7xxx new and old doing clustering so with those 
drivers and the cards they support I know it works.  If you are not using the 
aic7xxx driver then it may be that the driver is not honoring the initiator 
ID set in BIOS and so you have a conflict.

I don't see below where you say what specific adapter you are using?  

Eddie
On Friday 20 June 2003 03:32 pm, Ranade, Prakash wrote:
> both hang at boot time...they both try to initialize the device and
> hang..... if i boot node1 without starting node2 then node1 boots up but
> then when i try to boot node2 then it keeps saying "someone initialized
> channel A"....
>
> Prakash S. Ranade
> OCP - Oracle Certified DBA 8i, 9i
> 205 776 2320
>
> "Lets document it and call it a feature"
>
>
> -----Original Message-----
> From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
> Sent: Friday, June 20, 2003 2:24 PM
> To: Ranade, Prakash
> Cc: linux-scsi@vger.kernel.org
> Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
>
>
>
> Please define "there is a conflict when they try to initialize the bus."
>
> Do you have a SCSI analyzer seeing some conflict?
> When you boot them both up, one or both hang?
> One or the other can not read the fdisk when they boot?
>
>
> Eddie
>
> On Friday 20 June 2003 02:55 pm, Ranade, Prakash wrote:
> > yes they can see the drive but there is a conflict when they try to
> > initialize the bus...
> >
> > Prakash S. Ranade
> > OCP - Oracle Certified DBA 8i, 9i
> > 205 776 2320
> >
> > "Lets document it and call it a feature"
> >
> >
> > -----Original Message-----
> > From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
> > Sent: Friday, June 20, 2003 1:26 PM
> > To: jansen, frank; Ranade, Prakash; Mike Dresser
> > Cc: linux-scsi@vger.kernel.org
> > Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
> >
> >
> >
> > Depending on which adaptec card you are using you may need to set a
> > jumper to force termination.  Some of the older Adaptec cards have "soft"
> > termination. Meaning, when power is applied it will drive termination but
> > when power is dropped termination is dropped.  For those cards setting a
> > jumper will force termination even when the power is removed.  This is
> > pretty important if you power off one server.
> >
> > It is probably safe to assume other wise but just to be sure, this is not
> > a dual ported SCSI drive is it?  If so then it is not really a shared bus
> > and in that case the drive would need to terminate both busses.
> >
> > I agree with Frank here, you want the hosts at 7 and 6.
> >
> > If you power the servers up one at a time can they see the drive OK? 
> > Start simple.
> >
> > Eddie
> >
> > On Friday 20 June 2003 01:49 pm, jansen, frank wrote:
> > > This is fairly old technology, so I'll have to go back in my memory
> > > banks, but here are my recollections on setting this up:
> > >
> > > - Change the topology so that there is no termination on either HBA and
> > > use Y-cables with external termination, so that you can unplug either
> > > host from the bus without taking down access for the other host.  The
> > > topology will look as follows:
> > >
> > >     T   _______external SCSI driver______________   T
> > >      \ /                                         \ /
> > >       Y                                           Y
> > >    node 1 							node 2
> > >
> > > The other option is to leave termination on both HBAs, inwhich case you
> > > should never unplug anything.  Note that the bus must be arbitrated on
> > > both ends.  Also be sure not to violate any length limits on your SCSI
> > > bus. - ID settings: set one HBA to 7 and the other to 6.  The reason
> > > for these numbers is that the arbitration scheme for SCSI runs 7 down
> > > to 0 to 15 down to 8.  In your current configuration the disk has a
> > > higher arbitration priority than the HBAs.
> > > - Disable bus erset on power up on both HBAs; this will ensure that you
> > > can power either host without clearing all outstanding requests on the
> > > bus.
> > >
> > > If none of your pins are bent anywhere, this should work for sharing a
> > > device.  Now you'll get to the fun part of 2 hosts coordinating access
> > > to a single device.
> > >
> > > Good luck,
> > >
> > > Frank
> > >
> > > -----Original Message-----
> > > From: Ranade, Prakash [mailto:prakashr@intgroup.com]
> > > Sent: Friday, June 20, 2003 1:01 PM
> > > To: Mike Dresser
> > > Cc: linux-scsi@vger.kernel.org
> > > Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
> > >
> > >
> > > isent it true that...
> > > you cannot have two seperate SCSI controllers trying to maintain the
> > > same bus.They will fight..for same bus?
> > >
> > > Prakash S. Ranade
> > > OCP - Oracle Certified DBA 8i, 9i
> > > 205 776 2320
> > >
> > > "Lets document it and call it a feature"
> > >
> > >
> > > -----Original Message-----
> > > From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
> > > Sent: Friday, June 20, 2003 11:57 AM
> > > To: Ranade, Prakash
> > > Cc: linux-scsi@vger.kernel.org
> > > Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
> > >
> > > On Fri, 20 Jun 2003, Ranade, Prakash wrote:
> > > > node1 and node2 both running redhat linux 7.2...both have Adaptec
> > > > scsi
> > >
> > > card in it...scsi disk is  DataSilo DS-100 (see attached manual) using
> > > Seagate HD.
> > >
> > > > node1:scsi id = 14 - scsi termination is disabled
> > > > node1:scsi id = 15 - scsi termination is automatic (i tried all
> > >
> > > enabled/disabled/automatic nothing works)
> > >
> > > > external scsi disk id = 0
> > > >
> > > > node 1 							node 2
> > > >
> > > >
> > > > 	---------external SCSI drive---------------
> > >
> > > Any internal connections on either SCSI card?
> > >
> > > If not, set both node's to enabled scsi termination.
> > >
> > > Mike
> > >
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe linux-scsi"
> > > in the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe linux-scsi"
> > > in the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: how to connect 2 nodes to a SCSI disk (cabinet)

[Eddie Williams]

I am pretty sure we have tested with a 29160 card, which uses the 7892, in a 
cluster so the chip will work.  I am guessing from your reply that you are 
using the onboard aic7892 in a system?  

You list here SCSI id 14 still, have you tried changing one system to 7 and 
the other to 6.  It sure sounds like you are running into a clash of SCSI 
ID's.

Eddie
On Friday 20 June 2003 04:10 pm, Ranade, Prakash wrote:
> yes its the bios and i am using
>
> Adaptec AIC7xxx driver version: 6.2.8
> aic7892: Ultra160 Wide Channel A, SCSI Id=14, 32/253 SCBs
>
> Prakash S. Ranade
> OCP - Oracle Certified DBA 8i, 9i
> 205 776 2320
>
> "Lets document it and call it a feature"
>
>
> -----Original Message-----
> From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
> Sent: Friday, June 20, 2003 3:00 PM
> To: Ranade, Prakash
> Cc: linux-scsi@vger.kernel.org
> Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
>
>
>
> I take it this "someone initialized ..." message is coming from the BIOS? 
> I don't see anything like this in the SCSI driver source directory.
>
> I have used both the aic7xxx new and old doing clustering so with those
> drivers and the cards they support I know it works.  If you are not using
> the aic7xxx driver then it may be that the driver is not honoring the
> initiator ID set in BIOS and so you have a conflict.
>
> I don't see below where you say what specific adapter you are using?
>
> Eddie
>
> On Friday 20 June 2003 03:32 pm, Ranade, Prakash wrote:
> > both hang at boot time...they both try to initialize the device and
> > hang..... if i boot node1 without starting node2 then node1 boots up but
> > then when i try to boot node2 then it keeps saying "someone initialized
> > channel A"....
> >
> > Prakash S. Ranade
> > OCP - Oracle Certified DBA 8i, 9i
> > 205 776 2320
> >
> > "Lets document it and call it a feature"
> >
> >
> > -----Original Message-----
> > From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
> > Sent: Friday, June 20, 2003 2:24 PM
> > To: Ranade, Prakash
> > Cc: linux-scsi@vger.kernel.org
> > Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
> >
> >
> >
> > Please define "there is a conflict when they try to initialize the bus."
> >
> > Do you have a SCSI analyzer seeing some conflict?
> > When you boot them both up, one or both hang?
> > One or the other can not read the fdisk when they boot?
> >
> >
> > Eddie
> >
> > On Friday 20 June 2003 02:55 pm, Ranade, Prakash wrote:
> > > yes they can see the drive but there is a conflict when they try to
> > > initialize the bus...
> > >
> > > Prakash S. Ranade
> > > OCP - Oracle Certified DBA 8i, 9i
> > > 205 776 2320
> > >
> > > "Lets document it and call it a feature"
> > >
> > >
> > > -----Original Message-----
> > > From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
> > > Sent: Friday, June 20, 2003 1:26 PM
> > > To: jansen, frank; Ranade, Prakash; Mike Dresser
> > > Cc: linux-scsi@vger.kernel.org
> > > Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
> > >
> > >
> > >
> > > Depending on which adaptec card you are using you may need to set a
> > > jumper to force termination.  Some of the older Adaptec cards have
> > > "soft" termination. Meaning, when power is applied it will drive
> > > termination but when power is dropped termination is dropped.  For
> > > those cards setting a jumper will force termination even when the power
> > > is removed.  This is pretty important if you power off one server.
> > >
> > > It is probably safe to assume other wise but just to be sure, this is
> > > not a dual ported SCSI drive is it?  If so then it is not really a
> > > shared bus and in that case the drive would need to terminate both
> > > busses.
> > >
> > > I agree with Frank here, you want the hosts at 7 and 6.
> > >
> > > If you power the servers up one at a time can they see the drive OK?
> > > Start simple.
> > >
> > > Eddie
> > >
> > > On Friday 20 June 2003 01:49 pm, jansen, frank wrote:
> > > > This is fairly old technology, so I'll have to go back in my memory
> > > > banks, but here are my recollections on setting this up:
> > > >
> > > > - Change the topology so that there is no termination on either HBA
> > > > and use Y-cables with external termination, so that you can unplug
> > > > either host from the bus without taking down access for the other
> > > > host.  The topology will look as follows:
> > > >
> > > >     T   _______external SCSI driver______________   T
> > > >      \ /                                         \ /
> > > >       Y                                           Y
> > > >    node 1 							node 2
> > > >
> > > > The other option is to leave termination on both HBAs, inwhich case
> > > > you should never unplug anything.  Note that the bus must be
> > > > arbitrated on both ends.  Also be sure not to violate any length
> > > > limits on your SCSI bus. - ID settings: set one HBA to 7 and the
> > > > other to 6.  The reason for these numbers is that the arbitration
> > > > scheme for SCSI runs 7 down to 0 to 15 down to 8.  In your current
> > > > configuration the disk has a higher arbitration priority than the
> > > > HBAs.
> > > > - Disable bus erset on power up on both HBAs; this will ensure that
> > > > you can power either host without clearing all outstanding requests
> > > > on the bus.
> > > >
> > > > If none of your pins are bent anywhere, this should work for sharing
> > > > a device.  Now you'll get to the fun part of 2 hosts coordinating
> > > > access to a single device.
> > > >
> > > > Good luck,
> > > >
> > > > Frank
> > > >
> > > > -----Original Message-----
> > > > From: Ranade, Prakash [mailto:prakashr@intgroup.com]
> > > > Sent: Friday, June 20, 2003 1:01 PM
> > > > To: Mike Dresser
> > > > Cc: linux-scsi@vger.kernel.org
> > > > Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
> > > >
> > > >
> > > > isent it true that...
> > > > you cannot have two seperate SCSI controllers trying to maintain the
> > > > same bus.They will fight..for same bus?
> > > >
> > > > Prakash S. Ranade
> > > > OCP - Oracle Certified DBA 8i, 9i
> > > > 205 776 2320
> > > >
> > > > "Lets document it and call it a feature"
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
> > > > Sent: Friday, June 20, 2003 11:57 AM
> > > > To: Ranade, Prakash
> > > > Cc: linux-scsi@vger.kernel.org
> > > > Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
> > > >
> > > > On Fri, 20 Jun 2003, Ranade, Prakash wrote:
> > > > > node1 and node2 both running redhat linux 7.2...both have Adaptec
> > > > > scsi
> > > >
> > > > card in it...scsi disk is  DataSilo DS-100 (see attached manual)
> > > > using Seagate HD.
> > > >
> > > > > node1:scsi id = 14 - scsi termination is disabled
> > > > > node1:scsi id = 15 - scsi termination is automatic (i tried all
> > > >
> > > > enabled/disabled/automatic nothing works)
> > > >
> > > > > external scsi disk id = 0
> > > > >
> > > > > node 1 							node 2
> > > > >
> > > > >
> > > > > 	---------external SCSI drive---------------
> > > >
> > > > Any internal connections on either SCSI card?
> > > >
> > > > If not, set both node's to enabled scsi termination.
> > > >
> > > > Mike
> > > >
> > > > -
> > > > To unsubscribe from this list: send the line "unsubscribe linux-scsi"
> > > > in the body of a message to majordomo@vger.kernel.org
> > > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > > > -
> > > > To unsubscribe from this list: send the line "unsubscribe linux-scsi"
> > > > in the body of a message to majordomo@vger.kernel.org
> > > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@vger.kernel.org
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Re: how to connect 2 nodes to a SCSI disk (cabinet)

[Steven Dake]

Prakash,

I have seen using the AIC 39160 that the BIOS will lock up on one node 
if it receives a reset during BIOS device scan with two hosts.  There is 
really nothing you can do, but get Adaptec to fix their buggy BIOS.  I 
don't know if other brands have this similiar problem.  If you really 
want multi-host storage access, you should consider using FibreChannel 
which doesn't have these sorts of issues.

Thanks
-steve

Ranade, Prakash wrote:

>yes its the bios and i am using 
>
>Adaptec AIC7xxx driver version: 6.2.8
>aic7892: Ultra160 Wide Channel A, SCSI Id=14, 32/253 SCBs
>
>Prakash S. Ranade
>OCP - Oracle Certified DBA 8i, 9i
>205 776 2320
>
>"Lets document it and call it a feature"
>
>
>-----Original Message-----
>From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
>Sent: Friday, June 20, 2003 3:00 PM
>To: Ranade, Prakash
>Cc: linux-scsi@vger.kernel.org
>Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
>
>
>
>I take it this "someone initialized ..." message is coming from the BIOS?  I 
>don't see anything like this in the SCSI driver source directory.
>
>I have used both the aic7xxx new and old doing clustering so with those 
>drivers and the cards they support I know it works.  If you are not using the 
>aic7xxx driver then it may be that the driver is not honoring the initiator 
>ID set in BIOS and so you have a conflict.
>
>I don't see below where you say what specific adapter you are using?  
>
>Eddie
>On Friday 20 June 2003 03:32 pm, Ranade, Prakash wrote:
>  
>
>>both hang at boot time...they both try to initialize the device and
>>hang..... if i boot node1 without starting node2 then node1 boots up but
>>then when i try to boot node2 then it keeps saying "someone initialized
>>channel A"....
>>
>>Prakash S. Ranade
>>OCP - Oracle Certified DBA 8i, 9i
>>205 776 2320
>>
>>"Lets document it and call it a feature"
>>
>>
>>-----Original Message-----
>>From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
>>Sent: Friday, June 20, 2003 2:24 PM
>>To: Ranade, Prakash
>>Cc: linux-scsi@vger.kernel.org
>>Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
>>
>>
>>
>>Please define "there is a conflict when they try to initialize the bus."
>>
>>Do you have a SCSI analyzer seeing some conflict?
>>When you boot them both up, one or both hang?
>>One or the other can not read the fdisk when they boot?
>>
>>
>>Eddie
>>
>>On Friday 20 June 2003 02:55 pm, Ranade, Prakash wrote:
>>    
>>
>>>yes they can see the drive but there is a conflict when they try to
>>>initialize the bus...
>>>
>>>Prakash S. Ranade
>>>OCP - Oracle Certified DBA 8i, 9i
>>>205 776 2320
>>>
>>>"Lets document it and call it a feature"
>>>
>>>
>>>-----Original Message-----
>>>From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
>>>Sent: Friday, June 20, 2003 1:26 PM
>>>To: jansen, frank; Ranade, Prakash; Mike Dresser
>>>Cc: linux-scsi@vger.kernel.org
>>>Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
>>>
>>>
>>>
>>>Depending on which adaptec card you are using you may need to set a
>>>jumper to force termination.  Some of the older Adaptec cards have "soft"
>>>termination. Meaning, when power is applied it will drive termination but
>>>when power is dropped termination is dropped.  For those cards setting a
>>>jumper will force termination even when the power is removed.  This is
>>>pretty important if you power off one server.
>>>
>>>It is probably safe to assume other wise but just to be sure, this is not
>>>a dual ported SCSI drive is it?  If so then it is not really a shared bus
>>>and in that case the drive would need to terminate both busses.
>>>
>>>I agree with Frank here, you want the hosts at 7 and 6.
>>>
>>>If you power the servers up one at a time can they see the drive OK? 
>>>Start simple.
>>>
>>>Eddie
>>>
>>>On Friday 20 June 2003 01:49 pm, jansen, frank wrote:
>>>      
>>>
>>>>This is fairly old technology, so I'll have to go back in my memory
>>>>banks, but here are my recollections on setting this up:
>>>>
>>>>- Change the topology so that there is no termination on either HBA and
>>>>use Y-cables with external termination, so that you can unplug either
>>>>host from the bus without taking down access for the other host.  The
>>>>topology will look as follows:
>>>>
>>>>    T   _______external SCSI driver______________   T
>>>>     \ /                                         \ /
>>>>      Y                                           Y
>>>>   node 1 							node 2
>>>>
>>>>The other option is to leave termination on both HBAs, inwhich case you
>>>>should never unplug anything.  Note that the bus must be arbitrated on
>>>>both ends.  Also be sure not to violate any length limits on your SCSI
>>>>bus. - ID settings: set one HBA to 7 and the other to 6.  The reason
>>>>for these numbers is that the arbitration scheme for SCSI runs 7 down
>>>>to 0 to 15 down to 8.  In your current configuration the disk has a
>>>>higher arbitration priority than the HBAs.
>>>>- Disable bus erset on power up on both HBAs; this will ensure that you
>>>>can power either host without clearing all outstanding requests on the
>>>>bus.
>>>>
>>>>If none of your pins are bent anywhere, this should work for sharing a
>>>>device.  Now you'll get to the fun part of 2 hosts coordinating access
>>>>to a single device.
>>>>
>>>>Good luck,
>>>>
>>>>Frank
>>>>
>>>>-----Original Message-----
>>>>From: Ranade, Prakash [mailto:prakashr@intgroup.com]
>>>>Sent: Friday, June 20, 2003 1:01 PM
>>>>To: Mike Dresser
>>>>Cc: linux-scsi@vger.kernel.org
>>>>Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
>>>>
>>>>
>>>>isent it true that...
>>>>you cannot have two seperate SCSI controllers trying to maintain the
>>>>same bus.They will fight..for same bus?
>>>>
>>>>Prakash S. Ranade
>>>>OCP - Oracle Certified DBA 8i, 9i
>>>>205 776 2320
>>>>
>>>>"Lets document it and call it a feature"
>>>>
>>>>
>>>>-----Original Message-----
>>>>From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
>>>>Sent: Friday, June 20, 2003 11:57 AM
>>>>To: Ranade, Prakash
>>>>Cc: linux-scsi@vger.kernel.org
>>>>Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
>>>>
>>>>On Fri, 20 Jun 2003, Ranade, Prakash wrote:
>>>>        
>>>>
>>>>>node1 and node2 both running redhat linux 7.2...both have Adaptec
>>>>>scsi
>>>>>          
>>>>>
>>>>card in it...scsi disk is  DataSilo DS-100 (see attached manual) using
>>>>Seagate HD.
>>>>
>>>>        
>>>>
>>>>>node1:scsi id = 14 - scsi termination is disabled
>>>>>node1:scsi id = 15 - scsi termination is automatic (i tried all
>>>>>          
>>>>>
>>>>enabled/disabled/automatic nothing works)
>>>>
>>>>        
>>>>
>>>>>external scsi disk id = 0
>>>>>
>>>>>node 1 							node 2
>>>>>
>>>>>
>>>>>	---------external SCSI drive---------------
>>>>>          
>>>>>
>>>>Any internal connections on either SCSI card?
>>>>
>>>>If not, set both node's to enabled scsi termination.
>>>>
>>>>Mike
>>>>
>>>>-
>>>>To unsubscribe from this list: send the line "unsubscribe linux-scsi"
>>>>in the body of a message to majordomo@vger.kernel.org
>>>>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>>>-
>>>>To unsubscribe from this list: send the line "unsubscribe linux-scsi"
>>>>in the body of a message to majordomo@vger.kernel.org
>>>>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>>>        
>>>>
>
>-
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>
>  
>