On 06/09/2015 02:49 PM, Alexandre DERUMIER wrote:
> Hi,
>
> I was testing qemu 2.3 with librbd, and I notice a warning
>
> WARNING: Image format was not specified for
> 'rbd:pooltest/vm-100-disk-1:mon_host=10.5.0.16:auth_supported=none' and
> probing guessed raw.
> Automatically detecting the format is dangerous for raw images,
> write operations on block 0 will be restricted.
> Specify the 'raw' format explicitly to remove the restrictions.
>
>
>
> It seem that we need to pass format=raw to the drive string, or we are not
> able to write block0.
>
> Don't have tested with other storages, but I think it should apply on
> iscsi,zfs and sheepdog too
>
Hallo Alexandre
Yes I have just seen that with ZFS today:
qm start 103
Running as unit 103.scope.
WARNING: Image format was not specified for
'/dev/zvol/tank/vm-103-disk-1' and probing guessed raw.
Automatically detecting the format is dangerous for raw images,
write operations on block 0 will be restricted.
Specify the 'raw' format explicitly to remove the restrictions
Emmanuel
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