Hi, all:
I have planned to add the support to create qcow2 format file in NFS
driver ([1]). From the comment of Eric Harney, I know that cinder-backup
service currently assumes the volume is raw-formatted, and enable creating
qcow2 in NFS driver will break backups of NFS volumes .
After reading the code of backup service, I find we can first mount the
qcow2 volume as a NBD device and then pass the NBD device as the "source
volume_file" to backup service. Similar method of mounting qcow2 as NBD device
has already used in Nova now. I think we can add it to NFS driver for backup,
and it can be used for GlusterFS too.
Any advice? Is there something I have not expected?
[1] https://review.openstack.org/#/c/92011/
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zhangleiqiang (Trump)
Best Regards
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