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 -- Pete Wright p...@nomadlogic.org twitter => @nomadlogicLA _______________________________________________ firstname.lastname@example.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"