[ovirt-users] upgrade path from Ovirt 3.5x to 3.6x

[Andrea Ghelardi]

Thanks Michal,

Your reply somehow answer to my question, but I still have some bits of
fuzziness

Hosted engine VM upgrade itself is almost clear (maintenance, db backup,
reformat, reinstall, db import).

However:

1.       Inter-cluster migration is somehow unsupported. Should we worried
about moving VM from EL6 cluster to EL7? You know... different vdsm etc....
is ovirt migration feature atomic and reversible (if something goes wrong
during the process)?

2.       More important: the only Ovirt version that supports both EL6.6
and EL7.1 is 3.53. my real question is: what happen as soon as I finish
upgrade of my ovirt to version 3.54 (or 3.55) *while running HOSTS on EL6.6*
?



I mean, there will be a point in time when a version mismatch/overlap will
be unavoidable.

For example: how people should correctly jump from version 3.53 (EL6.6) to
3.54 (EL6.7)?



Ovirt team should support at least one or two previous version to support
overlaps...



Thanks

AG



*From:* Michal Skrivanek [mailto:michal.skrivanek at redhat.com]
*Sent:* Friday, October 09, 2015 1:33 PM
*To:* Andrea Ghelardi
*Cc:* users (users at ovirt.org); Simone Tiraboschi
*Subject:* Re: [ovirt-users] upgrade path from Ovirt 3.5x to 3.6x





nono, the upgrade is live and all your VMs can keep humming. But there are
manual steps involved:



Simone can probably update about Hosted Engine which would be somewhat
special, but at least for regular VMs you can currently use:

1) create a new cluster with same settings as your existing cluster

2) remove one host from the old cluster (the one to be upgraded/reinstalled
to EL7). While moving the host to maintenance your VMs will be migrated to
other EL6 hosts in that cluster (make sure you have enough capacity to do
that beforehand, of course:)

3) upgrade/reinstall the host with EL7. If youdon't have anything custom on
the host reinstallation might be the best option

4) add it to the new cluster, installing/deploying it via UI, then it
should come up - this is your EL7-based cluster now

5) manually migrate (Migrate To button) some of your VMs from the old
cluster to the new one (there's an advanced section in the dialog, allowing
you cross-cluster migrations

6) repeat until all your hosts and VMs are on EL7-based cluster, then you
can decommission it, and perhaps rename the cluster back to its original
name



Thanks,

michal
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