i've used zfs for this, but i have to shut the guest down to do it. i'm
using zvols for my guest system disks, so it's
shut the guest down (maybe just to single-user mode)
make a zfs checkpoint
start the guest back up
zfs send the checkpoint
this also assumes that the sync-destination is a cold spare, sitting in
its shutdown state until needed.
for live sync you'll have to run software inside the guest that knows
how to properly freeze state. for example if there's a live database of
any kind you'll want it to be in its quiet state before you sync from
it. in those situations, i do use rsync.
bhyve could conceivably offer a feature to export the guest RAM, and
with a little page-stealing, this could be made into an incremental sync
feed. but i predict it would be enormous in size for any non-trivial guest.
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