[ovirt-users] Manually starting VMs via vdsClient (HE offline)

[Doug Ingham]

On 9 February 2017 at 12:03, Dan Yasny <dyasny at gmail.com> wrote:

>
> On Thu, Feb 9, 2017 at 9:55 AM, Doug Ingham <dougti at gmail.com> wrote:
>
>> Hi Dan,
>>
>> On 8 February 2017 at 18:26, Dan Yasny <dyasny at gmail.com> wrote:
>>>
>>>
>>> But seriously, above all, I'd recommend you backup the engine (it comes
>>> with a utility) often and well. I do it via cron every hour in production,
>>> keeping a rotation of hourly and daily backups, just in case. It doesn't
>>> take much space or resources, but it's more than just best practice - that
>>> database is the summary of the entire setup.
>>>
>>>
>> If you don't mind, may I ask what process you use for backing up your
>> engine? If you use HE, do you keep one server dedicated to just that VM?
>> I've not had that particular issue in the restore process yet, however I
>> read that it's recommended the HE host is free of virtual load before the
>> backup takes place. And as they need to be done frequently, I'm reading
>> that as a dedicated host...
>>
>>
> If you use a dedicated host, you might as well abandon self hosted. HE is
> nice for small setups with the HA built in for extra fun, but once you
> scale, it might not be able to cope and you'll need real hardware. You're
> running a heavy-ish java engine plus two databases after all.
>
> So as I said, all I do is add the engine-backup command to cron on the
> engine, and then my backup server comes in and pulls out the files via scp,
> also through cron. Nothing fancy really, but it lets me sleep at night
>

This particular project has 10 new maxed out servers to back it, and I
don't see it outgrowing that for at least a year or so. It's hardly a full
DC.
I presume the DB will become the heaviest part of the load, and I'm already
planning a separate high I/O environment for dedicated HA DB hosts.

See the top section of this page:
http://www.ovirt.org/documentation/self-hosted/chap-Backing_up_and_Restoring_an_EL-Based_Self-Hosted_Environment

It seems that I'll always have to keep at least one host free to be able to
avoid restore problems. If not, and I were to keep hourly backups, then
migrating VMs off the host every hour would just be a pain.

-- 
Doug
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