[ovirt-users] virtio-scsi drive order?

[Michal Skrivanek]

> On 16 Mar 2017, at 11:12, Yaniv Kaul <ykaul at redhat.com> wrote:
> 
> 
> 
> On Thu, Mar 16, 2017 at 11:56 AM, Martin Polednik <mpolednik at redhat.com <mailto: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-…

well, it may in case we are actually doing something wrong with controllers or iothreads due to recent changes in that area.

> 
> Y.
>  
> 
> Thanks,
> mpolednik
> 
> 
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