[ovirt-users] Restoring Hosted-Engine from a stale backup

[Doug Ingham]

Hi all,
 One of our engines has had a DB failure* & it seems there was an unnoticed
problem in its backup routine, meaning the last backup I've got is a couple
of weeks old.
Luckily, VDSM has kept the underlying VMs running without any
interruptions, so my objective is to get the HE back online & get the hosts
& VMs back under its control with minimal downtime.

So, my questions are the following...

   1. What problems can I expect to have with VMs added/modified since the
   last backup?
   2. As it's only the DB that's been affected, can I skip redeploying the
   Engine & jump straight to restoring the DB & rerunning engine-setup?
   3. The original docs I read didn't mention that it's best to leave a
   host in maintenance mode before running the engine backup, so my plan is to
   install a new temporary host on a separate server, re-add the old hosts &
   then once everything's back up, remove the temporary host. Are there any
   faults in this plan?
   4. When it comes to deleting the old HE VM, the docs point to a
   paywalled guide on redhat.com...?

CentOS 7
oVirt 4.0.4
Gluster 3.8

* Apparently a write somehow cleared fsync, despite not actually having
been written to disk?! No idea how that happened...

Many thanks,
-- 
Doug
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