[ovirt-users] Maximum time node can be offline.

[Martin Sivak]

Hi,

the hosts are almost stateless and we set up most of what is needed
during activation. Hosted engine has some configuration stored
locally, but that is just the path to the storage domain.

I think you should be fine unless you change the network topology
significantly. I would also install security updates once in while.

We can even shut down the hosts for you when you configure two cluster
scheduling properties: EnableAutomaticPM and HostsInReserve.
HostsInReserve should be at least 1 though. It behaves like this, as
long as the reserve host is empty, we shut down all the other empty
hosts. And we boot another host once a VM does not fit on other used
hosts and is places on the running reserve host. That would save you
the power of just one host, but it would still be highly available (if
hosted engine and storage allows that too).

Bear in mind that single host cluster is not highly available at all.

Best regards

Martin Sivak

On Fri, Feb 9, 2018 at 8:25 AM, Gianluca Cecchi
<gianluca.cecchi at gmail.com> wrote:
> On Fri, Feb 9, 2018 at 2:30 AM, Thomas Letherby <xrs444 at xrs444.net> wrote:
>>
>> Thanks, that answers my follow up question! :)
>>
>> My concern is that I could have a host off-line for a month say, is that
>> going to cause any issues?
>>
>> Thanks,
>>
>> Thomas
>>
>
> I think that if in the mean time you don't make any configuration changes
> and you don't update anything, there is no reason to have problems.
> In case of changes done, it could depend on what they are: are you thinking
> about any particular scenario?
>
>
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