[ovirt-users] oVirt HA behavior

[Arik Hadas]

On Tue, Sep 19, 2017 at 11:41 AM, Alex K <rightkicktech at gmail.com> wrote:

> Hi again,
>
> I performed a different test by isolating one host (say host A) through
> removing all its network interfaces (thus power management through IPMI was
> also not avaialble).
> The VMs (with VM lease enabled) were successfully restarted to another
> host.
> When connecting back the host A, the cluster performed a power management
> and the host became a member of the cluster.
> The VMs that were running on the host A were found "paused", which is
> normal.
> After 15 minutes I see that the VMs at host A are still in "paused" state
> and I would expect that the cluster should decide at some point to shutdown
> the paused VMs and continue with the VMs that are already running at other
> hosts.
>
> Is this behavior normal?
>

I believe it is not the expected behavior - the VM should not stay in
paused state when its lease expires. But we know about this, see comment 9
in [1].

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1459865


>
> Thanx,
> Alex
>
> On Tue, Sep 19, 2017 at 10:18 AM, Alex K <rightkicktech at gmail.com> wrote:
>
>> Hi All,
>>
>> Just completed the tests and it works great.
>> VM leases is just what I needed.
>>
>> Thanx,
>> Alex
>>
>> On Tue, Sep 19, 2017 at 10:16 AM, Yaniv Kaul <ykaul at redhat.com> wrote:
>>
>>>
>>>
>>> On Tue, Sep 19, 2017 at 1:00 AM, Alex K <rightkicktech at gmail.com> wrote:
>>>
>>>> Enabling VM leases could be an answer to this. Will test tomorrow.
>>>>
>>>>
>>> Indeed. Let us know how it worked for you.
>>>
>>>
>>>> Thanx,
>>>> Alex
>>>>
>>>> On Sep 18, 2017 7:50 PM, "Alex K" <rightkicktech at gmail.com> wrote:
>>>>
>>>> Hi All,
>>>>
>>>> I have the following issue with the HA behavior of oVirt 4.1 and need
>>>> to check with you if there is any work around from your experience.
>>>>
>>>> I have 3 servers (A, B, C) with hosted engine in self hosted setup on
>>>> top gluster with replica 3 + 1 arbiter. All good except one point:
>>>>
>>>> The hosts have been configured with power management using IPMI (server
>>>> iLO).
>>>> If I disconnect power from one host (say C) (or disconnect all network
>>>> cables of the host) the two other hosts go to a loop where they try to
>>>> verify the status of the host C by issuing power management commands to the
>>>> host C. Since power of host is off the server iLO does not respond on the
>>>> network and the power management of host C fails, leaving the VMs that were
>>>> running on the host C in an unknown state and they are never restarted to
>>>> the other hosts.
>>>>
>>>> Is there any fencing option to change this behavior so as if both
>>>> available hosts fail to do power management of the unresponsive host to
>>>> decide that the host is down and to restart the VMs of that host to the
>>>> other available hosts.
>>>>
>>>>
>>> No, this is a bad assumption. Perhaps they are the ones isolated form it?
>>> Y.
>>>
>>>
>>>>
>>>> I could also add additional power management through UPS to avoid this
>>>> issue but this is not currently an option and I am interested to see if
>>>> this behavior can be tweaked.
>>>>
>>>> Thanx,
>>>> Alex
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Users mailing list
>>>> Users at ovirt.org
>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>
>>>>
>>>
>>
>
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