[ovirt-users] Help with Power Management network

[Eli Mesika]

On Sat, Sep 30, 2017 at 2:51 PM, Dan Yasny <dyasny at gmail.com> wrote:

> The power management command is sent by the engine via a proxy host. That
> means you need at least one more host to act as proxy. The engine itself
> doesn't need to access the bmc network directly. Just like the engine needs
> no access to the atorage network to perform storage manipulations.
>
> I think in some recent versions fencing by the engine was introduced, but
> I don't have a setup in front of me to verify.
>

​No, this is an open RFE which we didn't apply yet and as far as I know
there is no plan for that in the near future.
So, currently there is a need for an additional host that will serve as a
proxy to the fencing operation.​
The main reason for the existence of the proxy host  is when a host that
has power management configure becomes non-responsive
In that case we might restart the host via its power management card
But, since this host may have some HA VMs that will be migrated to another
host before the problematic host is rebooted, we have to implement a
shutdown->wait for OFF status from PM card->migrate HA VMs->start->wait for
ON status from PM card
This is done in order to prevent running a VM on two hosts which will cause
corruption (brain split)




>
> On Sep 29, 2017 11:13 PM, "~Stack~" <i.am.stack at gmail.com> wrote:
>
>> On 09/29/2017 05:31 PM, Dan Yasny wrote:
>> > You need more than one host for power management
>> >
>>
>> Seriously?? I didn't see anything like that in the docs...Maybe I just
>> missed it.
>>
>> Also, why wouldn't it still validate? It should still be able to talk to
>> the interface over the BMC/IPMI network. The fact that I can run the
>> equivalent test on the command line makes it seem like it should at
>> least be able to check via the test. Obviously, it would be silly for it
>> to try to manage itself, but it could at least verify that the
>> configuration is valid, right?
>>
>> I have more hosts that I'm going to add, I was just hoping to do those
>> via the Foreman integration instead of manually building them. Since I'm
>> not quite ready for that, I will just build a second host on Monday and
>> report back.
>>
>> Thanks for the feedback. I would have never guess that as a possibility.
>> :-)
>>
>> ~Stack~
>>
>>
> _______________________________________________
> Users mailing list
> Users at ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ovirt.org/pipermail/users/attachments/20171001/a3fe8dc3/attachment.html>