I've had to do this a couple of times and always ended up with a working system in the end.

As a fall back option (although I've never had to use it) I have a backup engine VM running completely outside of oVIrt (ESXi host in my case). Then if the hosted_engine deploy fails for any reason you can restore onto the backup vm as a temp solution while you work through the hosted engine deploy issues.

A few things that come to mind: -

* You will need a dedicated gluster volume for hosted_storage and it needs to be replica+arbiter.
* Make sure you put the cluster in global maint mode before performing the engine backup, I recall having issues with the restore when I didn't do that.
* Migrate all other VMs off the host running Engine before doing the backup. This will be the host you will restore onto.


---- On Wed, 27 Nov 2019 09:46:23 +0000 Joseph Goldman <joseph@goldman.id.au> wrote ----

Hi List,

 In one of my installs, I set up the first storage domain (and where
the HostedEngine is) on a bigger NFS NAS - since then I have created a
Gluster volume that spans the 3 hosts and I'm putting a few VM's in
there for higher reliability (as SAN is single point of failure) namely
I'd like to put HostedEngine in there so it stays up no matter what and
can help report if issues occur (network issue to NAS, NAS dies etc etc)

 Looking through other posts and documentation, there's no real way to
move the HostedEngine storage, is this correct? The solution I've seen
is to backup the hosted engine DB, blow it away, and re-deploy it from
the .backup file configuring it to the new storage domain in the deploy
script - is this the only process? How likely is this to fail? Is it
likely that all VM's and settings will be picked straight back up and
continue to operate like normal? I dont have a test setup to play around
with atm so just trying to gauge confidence in such a solution.

Thanks,
Joe
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