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

[Eddie Williams <Eddie.Williams@steeleye.com>]

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
> > > >
> > > > -
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