Persistent naming for iSCSI devices

Persistent naming for iSCSI devices

[Surekha.PC]

Hi,

   The persistent naming for iscsi disks cannot not achieved with the
following rule in udev.config.

NUMBER, BUS="scsi", ID=C:B:T:L, NAME="c0b0t6l0"

The controller number is not unique for a particular HBA. Hence
persistency is not retained. To overcome this problem for iSCSI devices,
I would like to introduce another field in the following rule for udev.

NUMBER, BUS="scsi", id=C:B:T:L, device_type="iscsi", NAME="iscsi-b0t6l0"

With this approach the naming for iSCSI devices will be persistent
regardless of controller id.

Please let me know your comments.
 
thanks,
surekha 



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RE: Persistent naming for iSCSI devices

[Surekha.PC]

Hi,

Just a slight correction for my earlier mail.

The example should have been

NUMBER, BUS="scsi", ID=C:B:T:L, NAME="cCbBtTlL"

And with the new field to be used for iSCSI devices,

NUMBER, BUS="scsi", id=C:B:T:L, device_type="iscsi", NAME="iscsi-bBtTlL"

Thanks,
surekha

-----Original Message-----
From: linux-hotplug-devel-admin@lists.sourceforge.net
[mailto:linux-hotplug-devel-admin@lists.sourceforge.net] On Behalf Of
Surekha.PC
Sent: Friday, November 14, 2003 3:00 PM
To: linux-hotplug-devel@lists.sourceforge.net
Subject: Persistent naming for iSCSI devices 



Hi,

   The persistent naming for iscsi disks cannot not achieved with the
following rule in udev.config.

NUMBER, BUS="scsi", ID=C:B:T:L, NAME="c0b0t6l0"

The controller number is not unique for a particular HBA. Hence
persistency is not retained. To overcome this problem for iSCSI devices,
I would like to introduce another field in the following rule for udev.

NUMBER, BUS="scsi", id=C:B:T:L, device_type="iscsi", NAME="iscsi-b0t6l0"

With this approach the naming for iSCSI devices will be persistent
regardless of controller id.

Please let me know your comments.
 
thanks,
surekha 



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Re: Persistent naming for iSCSI devices

[Ihno Krumreich]

hi,

How does the name reflect the source where the disks
come from. Target, Lun and what does B stand for?

Ihno

On Fri, Nov 14, 2003 at 04:05:04PM +0530, Surekha.PC wrote:
> 
> Hi,
> 
> Just a slight correction for my earlier mail.
> 
> The example should have been
> 
> NUMBER, BUS="scsi", ID=C:B:T:L, NAME="cCbBtTlL"
> 
> And with the new field to be used for iSCSI devices,
> 
> NUMBER, BUS="scsi", id=C:B:T:L, device_type="iscsi", NAME="iscsi-bBtTlL"
> 
> Thanks,
> surekha
> 
> -----Original Message-----
> From: linux-hotplug-devel-admin@lists.sourceforge.net
> [mailto:linux-hotplug-devel-admin@lists.sourceforge.net] On Behalf Of
> Surekha.PC
> Sent: Friday, November 14, 2003 3:00 PM
> To: linux-hotplug-devel@lists.sourceforge.net
> Subject: Persistent naming for iSCSI devices 
> 
> 
> 
> Hi,
> 
>    The persistent naming for iscsi disks cannot not achieved with the
> following rule in udev.config.
> 
> NUMBER, BUS="scsi", ID=C:B:T:L, NAME="c0b0t6l0"
> 
> The controller number is not unique for a particular HBA. Hence
> persistency is not retained. To overcome this problem for iSCSI devices,
> I would like to introduce another field in the following rule for udev.
> 
> NUMBER, BUS="scsi", id=C:B:T:L, device_type="iscsi", NAME="iscsi-b0t6l0"
> 
> With this approach the naming for iSCSI devices will be persistent
> regardless of controller id.
> 

-- 
Best regards/Mit freundlichen Grüßen

Ihno Krumreich

"Never trust a computer you can lift."
--
Ihno Krumreich            ihno@suse.de
SuSE Linux AG             Projectmanager S390 & zSeries
Deutschherrnstr. 15-19    +49-911-74053-439
90429 Nürnberg            http://www.suse.de


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RE: Persistent naming for iSCSI devices

[Surekha.PC]

Hi,

I have the device type listed in the iSCSI device attributes under sysfs
just like vendor information. This will ensure the device is a iSCSI
device.

B stands for bus id. This is part of the quadruplet in the sysfs
hierarchy as shown below.

#ls -l /sys/class/scsi_device/
0:0:0:0   0:0:1:0   0:0:8:0   7:0:68:0  7:0:69:0  

Thanks,
surekha

-----Original Message-----
From: Ihno Krumreich [mailto:ihno@suse.de] 
Sent: Friday, November 14, 2003 7:51 PM
To: Surekha.PC
Cc: linux-hotplug-devel@lists.sourceforge.net
Subject: Re: Persistent naming for iSCSI devices


hi,

How does the name reflect the source where the disks
come from. Target, Lun and what does B stand for?

Ihno

On Fri, Nov 14, 2003 at 04:05:04PM +0530, Surekha.PC wrote:
> 
> Hi,
> 
> Just a slight correction for my earlier mail.
> 
> The example should have been
> 
> NUMBER, BUS="scsi", ID=C:B:T:L, NAME="cCbBtTlL"
> 
> And with the new field to be used for iSCSI devices,
> 
> NUMBER, BUS="scsi", id=C:B:T:L, device_type="iscsi", 
> NAME="iscsi-bBtTlL"
> 
> Thanks,
> surekha
> 
> -----Original Message-----
> From: linux-hotplug-devel-admin@lists.sourceforge.net
> [mailto:linux-hotplug-devel-admin@lists.sourceforge.net] On Behalf Of 
> Surekha.PC
> Sent: Friday, November 14, 2003 3:00 PM
> To: linux-hotplug-devel@lists.sourceforge.net
> Subject: Persistent naming for iSCSI devices
> 
> 
> 
> Hi,
> 
>    The persistent naming for iscsi disks cannot not achieved with the 
> following rule in udev.config.
> 
> NUMBER, BUS="scsi", ID=C:B:T:L, NAME="c0b0t6l0"
> 
> The controller number is not unique for a particular HBA. Hence 
> persistency is not retained. To overcome this problem for iSCSI 
> devices, I would like to introduce another field in the following rule

> for udev.
> 
> NUMBER, BUS="scsi", id=C:B:T:L, device_type="iscsi", 
> NAME="iscsi-b0t6l0"
> 
> With this approach the naming for iSCSI devices will be persistent 
> regardless of controller id.
> 

-- 
Best regards/Mit freundlichen Grüßen

Ihno Krumreich

"Never trust a computer you can lift."
--
Ihno Krumreich            ihno@suse.de
SuSE Linux AG             Projectmanager S390 & zSeries
Deutschherrnstr. 15-19    +49-911-74053-439
90429 Nürnberg            http://www.suse.de



-------------------------------------------------------
This SF.Net email sponsored by: ApacheCon 2003,
16-19 November in Las Vegas. Learn firsthand the latest
developments in Apache, PHP, Perl, XML, Java, MySQL,
WebDAV, and more! http://www.apachecon.com/
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Linux-hotplug-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel

RE: Persistent naming for iSCSI devices

[Surekha.PC]

Hi all,

 Can I submit a patch with the change I have proposed below for iSCSI
device naming ?

Thanks,
surekha

-----Original Message-----
From: Surekha.PC [mailto:surekhap@cisco.com] 
Sent: Friday, November 14, 2003 8:01 PM
To: 'Ihno Krumreich'
Cc: 'linux-hotplug-devel@lists.sourceforge.net'
Subject: RE: Persistent naming for iSCSI devices



Hi,

I have the device type listed in the iSCSI device attributes under sysfs
just like vendor information. This will ensure the device is a iSCSI
device.

B stands for bus id. This is part of the quadruplet in the sysfs
hierarchy as shown below.

#ls -l /sys/class/scsi_device/
0:0:0:0   0:0:1:0   0:0:8:0   7:0:68:0  7:0:69:0  

Thanks,
surekha

-----Original Message-----
From: Ihno Krumreich [mailto:ihno@suse.de] 
Sent: Friday, November 14, 2003 7:51 PM
To: Surekha.PC
Cc: linux-hotplug-devel@lists.sourceforge.net
Subject: Re: Persistent naming for iSCSI devices


hi,

How does the name reflect the source where the disks
come from. Target, Lun and what does B stand for?

Ihno

On Fri, Nov 14, 2003 at 04:05:04PM +0530, Surekha.PC wrote:
> 
> Hi,
> 
> Just a slight correction for my earlier mail.
> 
> The example should have been
> 
> NUMBER, BUS="scsi", ID=C:B:T:L, NAME="cCbBtTlL"
> 
> And with the new field to be used for iSCSI devices,
> 
> NUMBER, BUS="scsi", id=C:B:T:L, device_type="iscsi",
> NAME="iscsi-bBtTlL"
> 
> Thanks,
> surekha
> 
> -----Original Message-----
> From: linux-hotplug-devel-admin@lists.sourceforge.net
> [mailto:linux-hotplug-devel-admin@lists.sourceforge.net] On Behalf Of
> Surekha.PC
> Sent: Friday, November 14, 2003 3:00 PM
> To: linux-hotplug-devel@lists.sourceforge.net
> Subject: Persistent naming for iSCSI devices
> 
> 
> 
> Hi,
> 
>    The persistent naming for iscsi disks cannot not achieved with the
> following rule in udev.config.
> 
> NUMBER, BUS="scsi", ID=C:B:T:L, NAME="c0b0t6l0"
> 
> The controller number is not unique for a particular HBA. Hence
> persistency is not retained. To overcome this problem for iSCSI 
> devices, I would like to introduce another field in the following rule

> for udev.
> 
> NUMBER, BUS="scsi", id=C:B:T:L, device_type="iscsi",
> NAME="iscsi-b0t6l0"
> 
> With this approach the naming for iSCSI devices will be persistent
> regardless of controller id.
> 

-- 
Best regards/Mit freundlichen Grüßen

Ihno Krumreich

"Never trust a computer you can lift."
--
Ihno Krumreich            ihno@suse.de
SuSE Linux AG             Projectmanager S390 & zSeries
Deutschherrnstr. 15-19    +49-911-74053-439
90429 Nürnberg            http://www.suse.de



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Re: Persistent naming for iSCSI devices

[Greg KH]

On Wed, Nov 19, 2003 at 07:07:45PM +0530, Surekha.PC wrote:
> 
> Hi all,
> 
>  Can I submit a patch with the change I have proposed below for iSCSI
> device naming ?

Sure, patches are always good.

But have you looked at the %b modifier in the 006 release?  That might
work for you.

thanks,

greg k-h


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