Kind regards,But when we tried it, when the vm is running on the SPM, it get's in paused mode (for safety reasons, I know ;-) ). And stays there until the host gets MANUALLY fenced by rebooting it. So now my question is... How can I make the hypervisor fence (so reboots, so vm is moved) quicker?Now the result of this is that when the VM is not running on the SPM that it will migrate before going in pause mode.Ok,Thanx already for all the help. I adapted some things for quicker respons:
engine-config --get FenceQuietTimeBetweenOperationsInSec-->180
engine-config --set FenceQuietTimeBetweenOperationsInSec=60
engine-config --get StorageDomainFalureTimeoutInMinutes-->180
engine-config --set StorageDomainFalureTimeoutInMinutes=1
engine-config --get SpmCommandFailOverRetries-->5
engine-config --set SpmCommandFailOverRetries
engine-config --get SPMFailOverAttempts-->3
engine-config --set SPMFailOverAttempts=1
engine-config --get NumberOfFailedRunsOnVds-->3
engine-config --set NumberOfFailedRunsOnVds=1
engine-config --get vdsTimeout-->180
engine-config --set vdsTimeout=30
engine-config --get VDSAttemptsToResetCount-->2
engine-config --set VDSAttemptsToResetCount=1
engine-config --get TimeoutToResetVdsInSeconds-->60
engine-config --set TimeoutToResetVdsInSeconds=30
Koen2014-04-04 16:28 GMT+02:00 Koen Vanoppen <vanoppen.koen@gmail.com>:
Ja das waar. Maar was aan't rijden... Dus ik stuur maar door dan :-). Ik heb reeds de time out aangepast. Die stond op 5 min voor hij den time out ging geven. Staat nu op 2 min
On Apr 4, 2014 4:14 PM, "David Van Zeebroeck" <david.van.zeebroeck@brusselsairport.be> wrote:
Ik heb ze ook he
Maar normaal had de fencing moeten werken als ik het zo lees
Dus daar is ergens iets verkeerd gelopen zo te lezen
From: Koen Vanoppen [mailto:vanoppen.koen@gmail.com]
Sent: vrijdag 4 april 2014 16:07
To: David Van Zeebroeck
Subject: Fwd: Re: [Users] HA
David Van Zeebroeck
Product Manager Unix Infrastructure
Information & Communication Technology
Brussels Airport Company
david.van.zeebroeck@brusselsairport.be
FOLLOW US ON:
---------- Forwarded message ----------
From: "Michal Skrivanek" <michal.skrivanek@redhat.com>
Date: Apr 4, 2014 3:39 PM
Subject: Re: [Users] HA
To: "Koen Vanoppen" <vanoppen.koen@gmail.com>
Cc: "ovirt-users Users" <users@ovirt.org>
On 4 Apr 2014, at 15:14, Sander Grendelman wrote:
Do you have power management configured?
Was the "failed" host fenced/rebooted?
On Fri, Apr 4, 2014 at 2:21 PM, Koen Vanoppen <vanoppen.koen@gmail.com> wrote:
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
as said before, it's not safe hence we (try to) not migrate them.
They only get paused when they actually access the storage which may not be always the case. I.e. the storage connection is severed, host deemed NonOperational and VMs are getting migrated from it, then some of them will succeed if they didn't access that "bad" storage … the paused VMs will remain (mostly, it can still happen that they appear paused migrated on other host when the disk access occurs only at the last stage of migration)
so in other words, if you want to migrate the VMs without interruption it's not sometimes possible
if you are fine with the VMs restarted in short time on other host then power management/fencing will help here
Thanks,
michal
)
They only returned when we restored the fiber connection to the Hypervisor…
yes, since 3.3 we have the autoresume feature
Thanks,
michal
Kind Regards,
Koen
2014-04-04 13:52 GMT+02:00 Koen Vanoppen <vanoppen.koen@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@gmail.com>:
---------- Forwarded message ----------
From: "Doron Fediuck" <dfediuck@redhat.com>
Date: Apr 3, 2014 4:51 PM
Subject: Re: [Users] HATo: "Koen Vanoppen" <vanoppen.koen@gmail.com>
Cc: "Omer Frenkel" <ofrenkel@redhat.com>, <users@ovirt.org>, "Federico Simoncelli" <fsimonce@redhat.com>, "Allon Mureinik" <amureini@redhat.com>
----- Original Message -----
> From: "Koen Vanoppen" <vanoppen.koen@gmail.com>
> To: "Omer Frenkel" <ofrenkel@redhat.com>, users@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@redhat.com > :
>
>
>
>
>
> ----- Original Message -----
> > From: "Koen Vanoppen" < vanoppen.koen@gmail.com >
> > To: users@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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