[ovirt-users] virtio-scsi drive order?

[Yaniv Kaul]

On Thu, Mar 16, 2017 at 11:56 AM, Martin Polednik <mpolednik at redhat.com>
wrote:

> On 16/03/17 08:23 +0100, gflwqs gflwqs wrote:
>
>> Hi list!
>> When we upgraded our ovirt environment to 4.1 we get the virtio-scsi
>> interface as default for virtual disks.
>> We have seen a difference in drive order from when we used the virtio
>> interface.
>>
>> Before when we added disks the order of the drives were set by which order
>> the disks was created.
>> So if i had 1 disk as os disk it became vda and added a 50 GB disk that
>> disk became vdb and then added another 8GB disk that became vdc.
>>
>> But now when i add two additional disks with the virtio-scsi interface
>> like
>> the above when i reboot the vm the 50GB disk become sdc and the 8GB disk
>> become sdb even that i created the 50GB disk first?
>> How is the order decided in the virtio-scsi interface?
>> What can i do to ensure that the disks come in the order that i create
>> them?
>>
>> Regards
>> Christian
>>
>
> Could you post the XML (virsh -r list, note the domain
> number and virsh -r dumpxml $domainnumber) before and after adding the
> disks? Need to see whether there are also any iothreads or anything
> else.
>

It doesn't matter - the order of disk discovery on the SCSI bus (by udev?)
is quite random.
You must use /dev/disk/by-id/scsi-...

Y.


>
> Thanks,
> mpolednik
>
>
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