Re: [Xen-devel] [PATCH 0/3] domUloader

["Philip R. Auld" <pauld@xxxxxxxxxxx>]

Rumor has it that on Thu, Jan 26, 2006 at 02:01:38PM +0000 Ian Campbell said:
> On Thu, 2006-01-26 at 08:37 -0500, Philip R. Auld wrote:
> > It should be possible to use udev to assign a specific unique name
> > to each disk based
> 
> It already does this to some degree. From a handy Debian box:
> 
>         $ tree /dev/disk/
>         /dev/disk/
>         |-- by-id
>         |   |-- scsi-0ATA_ST3200826AS_Linux_ATA-SCSI_simulator -> ../../sda
>         |   |-- scsi-0ATA_ST3200826AS_Linux_ATA-SCSI_simulator-part1 -> 
> ../../sda1
>         |   |-- scsi-0ATA_ST3200826AS_Linux_ATA-SCSI_simulator-part2 -> 
> ../../sda2
>         |   `-- scsi-0ATA_ST3200826AS_Linux_ATA-SCSI_simulator-part3 -> 
> ../../sda3
>         |-- by-label
>         |   `-- boot -> ../../sda1
>         |-- by-path
>         |   |-- pci-0000:00:1f.1-ide-0:0 -> ../../hda
>         |   |-- pci-0000:00:1f.2-scsi-0:0:0:0 -> ../../sda
>         |   |-- pci-0000:00:1f.2-scsi-0:0:0:0-part1 -> ../../sda1
>         |   |-- pci-0000:00:1f.2-scsi-0:0:0:0-part2 -> ../../sda2
>         |   `-- pci-0000:00:1f.2-scsi-0:0:0:0-part3 -> ../../sda3
>         `-- by-uuid
>             `-- 8312472d-e311-4e0d-837c-6c4eb646a5e3 -> ../../sda1
> 
> The logic is in /etc/udev/persistent.rules. It might need updating with
> some iSCSI knowledge I suppose.

Right, but this is just showing which UID it mapped to sda. My point
was you can configure it to give a specific name to a specific UID: 

scsi-0ATA_ST3200826AS_Linux_ATA-SCSI_simulator -> ../../my_domU_disk

Then you use my_domU_disk in the xen domain configuration.
You can do this manually as well by looking up which sdX name the
deivce got and making a link it or device node with the same
major/minor. But I think udev can be configured to to it for you.
I don't know the details of how to make it do that, but that's part
of what it's for.

Cheers,

Phil

> 
> Ian.
> 

-- 
Philip R. Auld, Ph.D.                          Egenera, Inc.    
Software Architect                            165 Forest St.
(508) 858-2628                            Marlboro, MA 01752

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