On 08/01/2015 07:52 PM, pixelfairy wrote:
Id like to look at a read-only copy of running virtual machines for
compliance and potentially malware checks that the VMs are unaware of.
the first note on http://ceph.com/docs/master/rbd/rbd-snapshot/ warns
that the filesystem has to be in a consistent state. does that just mean
you might get a "crashed" filesystem or will some other bad thing happen
if you snapshot a running filesystem that hasned synced? would telling
the os to sync just before help?
Ideally you would do xfs_freeze -f, snap, xfs_freeze -u to get a
consistent fs for your snapshot. Despite the name this works on all
linux filesystems.
If you don't do this, like you said you get a crash-consistent snapshot,
which might require fs jounal replay (writing to the image). This is
doable using a clone of the snapshot, but it's a bit more complicated
to manage.
Josh
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