[Users] HA

[Koen Vanoppen]

So... It is possible for a fully automatic migration of the VM to another
hypervisor in case Storage connection fails?
How can we make this happen? Because for the moment, when we tested the
situation they stayed in pause state.
(Test situation:

   - Unplug the 2 fibre cables from the hypervisor
   - VM's go in pause state
   - VM's stayed in pause state until the failure was solved

)


They only returned when we restored the fiber connection to the
Hypervisor...

Kind Regards,

Koen



2014-04-04 13:52 GMT+02:00 Koen Vanoppen <vanoppen.koen at gmail.com>:

> So... It is possible for a fully automatic migration of the VM to another
> hypervisor in case Storage connection fails?
> How can we make this happen? Because for the moment, when we tested the
> situation they stayed in pause state.
> (Test situation:
>
>    - Unplug the 2 fibre cables from the hypervisor
>    - VM's go in pause state
>    - VM's stayed in pause state until the failure was solved
>
> )
>
>
> They only returned when we restored the fiber connection to the
> Hypervisor...
>
> Kind Regards,
>
> Koen
>
>
> 2014-04-03 16:53 GMT+02:00 Koen Vanoppen <vanoppen.koen at gmail.com>:
>
> ---------- Forwarded message ----------
>> From: "Doron Fediuck" <dfediuck at redhat.com>
>> Date: Apr 3, 2014 4:51 PM
>> Subject: Re: [Users] HA
>> To: "Koen Vanoppen" <vanoppen.koen at gmail.com>
>> Cc: "Omer Frenkel" <ofrenkel at redhat.com>, <users at ovirt.org>, "Federico
>> Simoncelli" <fsimonce at redhat.com>, "Allon Mureinik" <amureini at redhat.com>
>>
>>
>>
>> ----- Original Message -----
>> > From: "Koen Vanoppen" <vanoppen.koen at gmail.com>
>> > To: "Omer Frenkel" <ofrenkel at redhat.com>, users at ovirt.org
>> > Sent: Wednesday, April 2, 2014 4:17:36 PM
>> > Subject: Re: [Users] HA
>> >
>> > Yes, indeed. I meant not-operational. Sorry.
>> > So, if I understand this correctly. When we ever come in a situation
>> that we
>> > loose both storage connections on our hypervisor, we will have to
>> manually
>> > restore the connections first?
>> >
>> > And thanx for the tip for speeding up thins :-).
>> >
>> > Kind regards,
>> >
>> > Koen
>> >
>> >
>> > 2014-04-02 15:14 GMT+02:00 Omer Frenkel < ofrenkel at redhat.com > :
>> >
>> >
>> >
>> >
>> >
>> > ----- Original Message -----
>> > > From: "Koen Vanoppen" < vanoppen.koen at gmail.com >
>> > > To: users at ovirt.org
>> > > Sent: Wednesday, April 2, 2014 4:07:19 PM
>> > > Subject: [Users] HA
>> > >
>> > > Dear All,
>> > >
>> > > Due our acceptance testing, we discovered something. (Document will
>> > > follow).
>> > > When we disable one fiber path, no problem multipath finds it way no
>> pings
>> > > are lost.
>> > > BUT when we disabled both the fiber paths (so one of the storage
>> domain is
>> > > gone on this host, but still available on the other host), vms go in
>> paused
>> > > mode... He chooses a new SPM (can we speed this up?), put's the host
>> in
>> > > non-responsive (can we speed this up, more important) and the VM's
>> stay on
>> > > Paused mode... I would expect that they would be migrated (yes, HA is
>> >
>> > i guess you mean the host moves to not-operational (in contrast to
>> > non-responsive)?
>> > if so, the engine will not migrate vms that are paused to do io error,
>> > because of data corruption risk.
>> >
>> > to speed up you can look at the storage domain monitoring timeout:
>> > engine-config --get StorageDomainFalureTimeoutInMinutes
>> >
>> >
>> > > enabled) to the other host and reboot there... Any solution? We are
>> still
>> > > using oVirt 3.3.1 , but we are planning a upgrade to 3.4 after the
>> easter
>> > > holiday.
>> > >
>> > > Kind Regards,
>> > >
>> > > Koen
>> > >
>>
>> Hi Koen,
>> Resuming from paused due to io issues is supported (adding relevant
>> folks).
>> Regardless, if you did not define power management, you should manually
>> approve
>> source host was rebooted in order for migration to proceed. Otherwise we
>> risk
>> split-brain scenario.
>>
>> Doron
>>
>
>
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