-----Original Message-----
From: Derek Atkins [mailto:warlord@MIT.EDU]
Sent: Monday, May 21, 2018 8:33 AM
To: Simone Tiraboschi <stirabos@redhat.com>
Cc: users <users@ovirt.org>; ovirt@fateknollogee.com
Subject: [ovirt-users] Re: oVirt: single host install

Hi,

Simone Tiraboschi <stirabos@redhat.com> writes:

> On Mon, May 21, 2018 at 7:49 AM, <ovirt@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?

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? 


>     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?


>     What kind of storage?
>
> NFS in loopback could be problematic, I'd suggest gluster in replica 1
> or iSCSI.

I'm running loopback NFS and I've not encountered any issues.  I've been running this way since 2016-10-22.  I did not understand Gluster enough and wasn't sure how I could make a "replica 1" -- everything seemed to imply you *NEEDED* 3 gluster hosts.  So I went with what I knew -- NFS.

This might be problematic if I move forward to a multi-host platform as I'll have to "migrate" my storage -- specifically for hosted-engine -- which IIRC requires a re-install (or some other drastic measure).

-derek

--
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: https://urldefense.proofpoint.com/v2/url?u=http-3A__web.mit.edu_warlord_&d=DwIGaQ&c=Vxt5e0Osvvt2gflwSlsJ5DmPGcPvTRKLJyp031rXjhg&r=FiPhL0Cl1ymZlnTyAIIL75tE4L0reHcDdD-7wUtUGHA&m=aceiPp0tdZww5F1VjIbEi55JnMpkWzYlKSpsa56bcG8&s=Sxh76egRoJB5MNDdFRR9NubIiPK1tqZlSyW9tt4XzRQ&e=    PP-ASEL-IA     N1NWH

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