[ovirt-users] Affinity/HA for a set of VMs

[Doron Fediuck]

On Wed, Dec 14, 2016 at 12:10 PM, TranceWorldLogic . <
tranceworldlogic at gmail.com> wrote:

> Hi,
>
> After looking into some more document, I think storage level fencing is
> supported in ovirt via gluster.
> Can some one correct me on this ?
>
> Thanks,
> ~Rohit
>
> Hi,
hosted engine is using SanLock to protect the engine VM disks, which allows
only this VM storage
based fencing. There's work[1] being done to allow this to more VMs, but it
still reuiqres more work.
So for now you should be using host fencing only.

Doron

[1]
http://www.ovirt.org/develop/release-management/features/storage/sanlock-fencing/


> On Wed, Dec 14, 2016 at 2:32 PM, TranceWorldLogic . <
> tranceworldlogic at gmail.com> wrote:
>
>> Hi Doron,
>>
>> Yes, I am referring to storage level fencing like drbd/pacemaker tool.
>>
>> Thanks,
>> ~Rohit
>>
>>
>> On Wed, Dec 14, 2016 at 1:42 PM, Doron Fediuck <dfediuck at redhat.com>
>> wrote:
>>
>>>
>>>
>>> On Wed, Dec 14, 2016 at 9:23 AM, Yedidyah Bar David <didi at redhat.com>
>>> wrote:
>>>
>>>> On Wed, Dec 14, 2016 at 9:02 AM, TranceWorldLogic .
>>>> <tranceworldlogic at gmail.com> wrote:
>>>> > Hi,
>>>> >
>>>> > I was trying to explore more about fencing option supported in ovirt.
>>>> > But getting lost in documents.
>>>> >
>>>> > My requirement is to fence at VM level rather than host level.
>>>>
>>>> I am pretty certain that this is not called fencing. Fencing is for
>>>> hosts.
>>>> And it's meant for _stopping_ them, not starting.
>>>>
>>>> > e.g let assume VM1.1, VM1.2,VM1.3 are running on host1 and
>>>> VM2.1,VM2.2 VM2.3
>>>> > running on host2. Suppose due to some error only VM1.1 goes down
>>>> [Note:
>>>> > VM1.2 and VM1.3 in running state] then VM2.1 must come up.
>>>> >
>>>> > Can I get to know whether such functionality is supported by ovirt ?
>>>> > If yes, would you please explain also how it work
>>>> >           or would you share refernece for me to refer and understand
>>>> it ?
>>>> > if yes, is it configurable by python sdk ?
>>>>
>>>> No idea, but it might be possible using affinity rules and/or HA.
>>>> Changing the subject, to try to attract more relevant responses,
>>>> and adding Tomer.
>>>>
>>>> Best,
>>>> --
>>>> Didi
>>>>
>>>>
>>>>
>>> Hi,
>>> are you referring to storage based fencing?
>>>
>>
>>
>
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