[ovirt-users] HA on Non Responsive

[Yaniv Kaul]

On Tue, Nov 28, 2017 at 2:14 PM, Arthur Melo <arthur at afabrica.net> wrote:

> The oVirt show if the phisical host is unresponsive. Virtual Machines
> appear with a "?" on the status and I cannot start in another machine. I
> have to mark "host has been restarted" and put in management mode.
>
>
You might be missing the architecture here behind 'not responding'. If the
host is not responding, we don't know what the status of the VM is. We
don't know if the host is up or down.
This has two consequences:
1. We can't migrate the VM (as we can't communicate with our host daemon -
VDSM).
2. We can't run the VM elsewhere (as we can't be sure it's down, it might
cause corruption if we run it twice).

I've over-simplified a bit our architecture, as we have capabilities both
for the host and the VM to see if they are still renewing their leases on
the
storage.
In that case, we don't need to fence, but we still need to handle the
situation somehow.
Y.

Atenciosamente,
> Arthur Melo
> Linux User #302250
>
>
> 2017-11-28 10:01 GMT-02:00 Michal Skrivanek <michal.skrivanek at redhat.com>:
>
>>
>> On 28 Nov 2017, at 06:42, Arthur Melo <arthur at afabrica.net> wrote:
>>
>> I had configured, but, I want to migrate before fencing. It's too long to
>> start the machine again when phisical host not start.
>>
>>
>> then how do you know it’s non responsive and how do you want to make sure
>> it’s not still running without fencing?
>>
>>
>> Atenciosamente,
>> Arthur Melo
>> Linux User #302250
>>
>>
>> 2017-11-27 18:44 GMT-02:00 Michal Skrivanek <michal.skrivanek at redhat.com>
>> :
>>
>>>
>>> > On 27 Nov 2017, at 12:58, Arthur Melo <arthur at afabrica.net> wrote:
>>> >
>>> > Hello, there!
>>> >
>>> > Is it possible to reduce time to auto migrate machines when node is
>>> non responsive?
>>>
>>> if you configure power management on hosts so the actual state of VMs by
>>> fencing action it’s going to be faster
>>> do you have that configured?
>>>
>>> Thanks,
>>> michal
>>> >
>>> > Atenciosamente,
>>> > Arthur Melo
>>> > Linux User #302250
>>> >
>>> > _______________________________________________
>>> > Users mailing list
>>> > Users at ovirt.org
>>> > http://lists.ovirt.org/mailman/listinfo/users
>>>
>>>
>>
>>
>
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