[libvirt-users] Different SAS controller IDs

[Daniel P. Berrange]

On Thu, Jul 12, 2012 at 02:09:12PM +0400, Anton Nikiforov wrote:
> Dear All,
> 
> I have problem with setting up migration on Intel Multi-Flex server.
> The problem is that SAS controller IDs (and volume ids in
> /dev/disk/by-path directory) are different between nodes.
> 
> For example on node0 i have:
> lrwxrwxrwx 1 root root  9 Jun 29 07:20
> pci-0000:04:00.0-sas-0x500015500002040a-lun-0 -> ../../sda
> lrwxrwxrwx 1 root root 10 May 27 09:17
> pci-0000:04:00.0-sas-0x500015500002040a-lun-0-part1 -> ../../sda1
> .......
> 
> On node1 i have:
> lrwxrwxrwx 1 root root  9 Jul 12 21:19
> /dev/disk/by-path/pci-0000:04:00.0-sas-0x5000155000020409-lun-0 ->
> ../../sda
> lrwxrwxrwx 1 root root 10 Jul 12 21:19
> /dev/disk/by-path/pci-0000:04:00.0-sas-0x5000155000020409-lun-0-part1
> -> ../../sda1
> ........
> 
> Difference is in 0x500015500002040a and 0x5000155000020409
> But this is the matter of migration falure because migration script
> cannot find needed volume.
> 
> Is there any chance to fix it somehow?

Have you tried using /dev/disk/by-id/ aliases instead ?  IIRC, those are
based on the SCSI volume WWID which should be stable across any host
seeing the LUN

Daniel
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