Hi,
On 2013-02-25 20:46, Wolfgang Hennerbichler wrote:
maybe some of you are interested in this - I'm using a dedicated VM to
backup important VMs which have their storage in RBD. This is nothing
fancy and not implemented perfectly, but it works. The VM's don't notice
that they're backed up, the only requirement is that the filesystem of
the VM is directly on the RBD, the script doesn't calculate offsets of
partition tables.
Looking at how you're doing that, if you trust the script to be able to
create new snapshots; couldn't you do that with less machinery involved
by installing the ceph binaries on the backup host, creating the
snapshot and attaching it with rbd, rather than attaching it to the VM?
Also; where's the fsck call? You're snapshotting a running system; it's
almost guaranteed that you've done the snapshot in the middle of a batch
of writes; then again, it would be cool to be able to ask the VM to
sync, to capture a consistent filesystem, though.
I don't know about recent kernels, but older ones could be made to crash
by boldly mounting a filesystem that hadn't been fscked.
--
Martin Rudat
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