On 12/10/14 11:40 AM, Pete Wright wrote:
On 12/10/14 11:29, John-Mark Gurney wrote:
Pete Wright wrote this message on Mon, Dec 08, 2014 at 15:44 -0800:
On 12/08/14 15:30, Craig Rodrigues wrote:
(3) When you want to backup the VM, do a "zfs snapshot" take take a
snapshot of the ZFS zvol.
will this ensure that your zvol is consistent, or rather will the
filesystem overlaid on the zvol device be ensured it is consistent when
the hypervisor issues a snapshot command?
That's the beauty of FreeBSD... UFS provides this w/ soft updates, and
ZFS does this through COW... In both cases, as far as I understand it,
it is safe to snapshot the FS...
hrm not sure I think that is a reliable methodology. You'll be forced
to recover you VM's filesystem at best, and potentially have corrupt
data if blocks were still sitting in cache and had not returned a
filehande. My guess is that this method will work with out issues
%80-%90 of the time - but you still expose yourself to possible data
loss or corruption.
I think you and others have mentioned the proper way to do this -
snapshot the guess filesystem from with-in the guest VM itself.
cheers,
-pete
Hence why in the original email I wrote:
*option 3 is the least safe imo as you can wind up with filesystem "angry".*
in case 1 and 2 you'll have UFS snapshots that should be "OK" to restore from.
in case 4 you are also doing snapshot, but you switch to ZFS.
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