Re: [Users] HA

From: "Koen Vanoppen" <vanoppen.koen(a)gmail.com&gt; To: users(a)ovirt.org Sent: Tuesday, April 8, 2014 3:41:02 PM Subject: Re: [Users] HA Or with other words, the SPM and the VM should move almost immediate after the storage connections on the hypervisor are gone. I know, I'm asking to much maybe, but we would be very happy :-) :-). So sketch: Mercury1 SPM Mercury 2 Mercury1 loses both fibre connections --> goes in non-operational and the VM goes in paused state and stays this way, until I manually reboot the host so it fences. What I would like is that when mercury 1 loses both fibre connections. He fences immediate so the VM's are moved also almost instantly... If this is possible... :-) Kind regards and thanks for all the help!

2014-04-08 14:26 GMT+02:00 Koen Vanoppen < vanoppen.koen(a)gmail.com > : 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 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. 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? Kind regards, Koen 2014-04-04 16:28 GMT+02:00 Koen Vanoppen < vanoppen.koen(a)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(a)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(a)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 T +32 (0)2 753 66 24 M +32 (0)497 02 17 31 david.van.zeebroeck(a)brusselsairport.be www.brusselsairport.be FOLLOW US ON: Company Info ---------- Forwarded message ---------- From: "Michal Skrivanek" < michal.skrivanek(a)redhat.com > Date: Apr 4, 2014 3:39 PM Subject: Re: [Users] HA To: "Koen Vanoppen" < vanoppen.koen(a)gmail.com > Cc: "ovirt-users Users" < users(a)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(a)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(a)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(a)gmail.com >: ---------- Forwarded message ---------- From: "Doron Fediuck" < dfediuck(a)redhat.com > Date: Apr 3, 2014 4:51 PM Subject: Re: [Users] HA To: "Koen Vanoppen" < vanoppen.koen(a)gmail.com > Cc: "Omer Frenkel" < ofrenkel(a)redhat.com >, < users(a)ovirt.org >, "Federico Simoncelli" < fsimonce(a)redhat.com >, "Allon Mureinik" < amureini(a)redhat.com > ----- Original Message ----- > From: "Koen Vanoppen" < vanoppen.koen(a)gmail.com > > To: "Omer Frenkel" < ofrenkel(a)redhat.com >, users(a)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(a)redhat.com > : > > > > > > ----- Original Message ----- > > From: "Koen Vanoppen" < vanoppen.koen(a)gmail.com > > > To: users(a)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 _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users