[pve-devel] drive-mirror to rbd don't do thin provisioning .

[Alexandre DERUMIER]

Hi,

I was testing drive-mirror to rbd storage, and it's seem that zero block are written to rbd storage,
so thin provisioning don't work.

It's working fine with backup-restore.

I have check the code of rbd block driver,

and it's seem to miss the bdrv_co_write_zeroes feature.

(Which is not use by backup-restore).


Dietmar, could you confirm that bdrv_co_write_zeroes could be the problem ?
(I think you have a better understanding of this code ?)

I'll ask to the ceph and qemu mailing, but I would like to have confirmation before ask.

Alexandre