Justin Zygmont <jzygmont(a)proofpoint.com> writes:
From: Derek Atkins [mailto:warlord@MIT.EDU]
Sent: Monday, May 21, 2018 8:33 AM
To: Simone Tiraboschi <stirabos(a)redhat.com>
Cc: users <users(a)ovirt.org>; ovirt(a)fateknollogee.com
Subject: [ovirt-users] Re: oVirt: single host install
Simone Tiraboschi <stirabos(a)redhat.com> writes:
> On Mon, May 21, 2018 at 7:49 AM, <ovirt(a)fateknollogee.com> wrote:
> Use case: small sites with a minimum number of vm's.
> Is there such a thing as a single host install?
> In the past we had the all-in-one mode but we deprecated it.
> Now the suggested mode is hosted-engine since you could expand it
> adding other hosts in the future.
Sounds like "local storage" is useless then?
IMHO, yes. When I installed (4.0) you could not use it for
hosted-engine storage. Don't know if that changed, but what's the point
of using different storage methods? I already had to set up a local NFS
(pr theoretically Gluster) for HE -- so might as well re-use that for my
main storage too!
I am running in this configuration and have had little problem. I
migrated from an old vmware-server platform, and, modulo a few hiccups along the way and a
few false starts as I was installing ovirt, it's been pretty stable for me!
Did you use NFS for all storage domains?
Both HE and Main Data storage domains are backed by SSD.
My ISO domain is backed by spinning rust.
> Is it valid for production use?
> With a single host the upgrades will become more intrusive: without
> the capability to migrate your VMs on other hosts at upgrade time, you
> will be required to bring down everything.
This is true -- I have to bring everything down when I want to upgrade the system,
especially the host itself. So I don't upgrade as often as I might if I had multiple
hosts where I could migrate.
How can you do it without a second host and importing with a temporary storage domain?
I just shut everything down. So long as it's planned my users can
handle a 30-60 minute outage. And this is only when I update the host.
I can update the Engine on its own, and often will update my VMs
simultaneously to minimize downtime. But I'm okay with some downtime.
PS: I don't know what mailer you used, but I had a very hard time
differentiating your responses from mine. Hopefully I did not miss one
of your questions.
Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
Member, MIT Student Information Processing Board (SIPB)
warlord(a)MIT.EDU PGP key available