SR volume group corrupted with simultaneous snapshots

Hi,

The backup (consisting of snapshots with xapi) is corrupting a volume group sometimes. It seems that there is a race condition happening while snapshotting multiple vm at the same time.

The backup is calling xapi to snapshot multiple vm at the same time (2 concurrent snapshots by default).

Sometimes, everything is running smoothly, but most of the times, we loose a volume group after the backup : 

FAILED in util.pread: (rc 5) stdout: '', stderr: '  /dev/disk/by-scsid/23133613436326131/mapper: Checksum error

After analyzing logs, it seems that the master of the pool is corrupting itself the volume group (no slave has written to the volume group according to /etc/lvm/backup).

We have logs of the issue from all servers of the pool if necessary.

Best regards,

Nicolas Michaux