Re: [Users] ITA-2967 URGENT: ovirt Node turns status to "non operational" STORAGE_DOMAIN_UNREACHABLE

From: "Omer Frenkel" <ofrenkel(a)redhat.com&gt; To: "Itamar Heim" <iheim(a)redhat.com&gt;, "Sven Knohsalla" <s.knohsalla(a)netbiscuits.com&gt; Cc: users(a)ovirt.org Sent: Tuesday, October 16, 2012 2:02:50 PM Subject: Re: [Users] ITA-2967 URGENT: ovirt Node turns status to "non operational" STORAGE_DOMAIN_UNREACHABLE ----- Original Message ----- > From: "Itamar Heim" <iheim(a)redhat.com&gt; > To: "Sven Knohsalla" <s.knohsalla(a)netbiscuits.com&gt; > Cc: users(a)ovirt.org > Sent: Monday, October 15, 2012 8:36:07 PM > Subject: Re: [Users] ITA-2967 URGENT: ovirt Node turns status to > "non operational" STORAGE_DOMAIN_UNREACHABLE > > On 10/15/2012 03:56 PM, Sven Knohsalla wrote: > > Hi, > > > > sometimes one hypervisors status turns to „Non-operational“ with > > error > > “STORAGE_DOMAIN_UNREACHABLE” and the live-migration (activated > > for > > all > > VMs) is starting. > > > > I don’t currently know why the ovirt-node turns to this status, > > because > > the connected iSCSI SAN is available all the time(checked via > > iscsi > > session and lsblk), I’m also able to r/w on the SAN during that > > time. > > > > We can simply activate this ovirt-node and it turns up again. The > > migration process is running from scratch and hitting the some > > error > > àReboot of ovirt-node necessary! > > > > When a hypervisor turns to “non-operational” status, the live > > migration > > is starting and tries to migrate ~25 VMs (~ 100 GB RAM to > > migrate). > > > > During that process the network workload goes 100%, some VMs will > > be > > migrated, then the destination host also turns to > > “non-operational” > > status with error “STORAGE_DOMAIN_UNREACHABLE”. > > > > Many VMs are still running on their origin host, some are > > paused, > > some > > are showing “migration from” status. > > > > After a reboot of the origin host, the VMs turns of course into > > unknown > > state. > > > > So the whole cluster is down :/ > > > > For this problem I have some questions: > > > > -Does ovirt engine just use the ovirt-mgmt network for > > migration/HA? > > yes. > > > > > -If so, is there any possibility to *add*/switch a network for > > migration/HA? > > you can bond, not yet add another one. > > > > > -Is the kind of way we are using the live-migration not > > recommended? > > > > -Which engine module checks the availability of the storage > > domain > > for > > the ovirt-nodes? > > the engine. > > > > > -Is there any timeout/cache option we can set/increase to avoid > > this > > problem? > > well, not clear what the problem is. > also, vdsm is supposed to throttle live migration to 3 vm's in > parallel > iirc. > also, you can at cluster level configure to not live migrate VMs on > non-operational status. > > > > > -Is there any known problem with the versions we are using? > > (Migration > > to ovirt-engine 3.1 is not possible atm) > > oh, the cluster level migration policy on non operational may be a > 3.1 > feature, not sure. > AFAIR, it's in 3.0 > > > > -Is it possible to modify the migration queue to just migrate a > > max. of > > 4 VMs at the same time for example? > > yes, there is a vdsm config for that. i am pretty sure 3 is the > default > though? > > > > > _ovirt-engine: _ > > > > FC 16: 3.3.6-3.fc16.x86_64 > > > > Engine: 3.0.0_0001-1.6.fc16 > > > > KVM based VM: 2 vCPU, 4 GB RAM > > > > 1 NIC for ssh/https access > > 1 NIC for ovirtmgmt network access > > engine source: dreyou repo > > > > _ovirt-node:_ > > Node: 2.3.0 > > 2 bonded NICs -> Frontend Network > > 4 Multipath NICs -> SAN connection > > > > Attached some relevant logfiles. > > > > Thanks in advance, I really appreciate your help! > > > > Best, > > > > Sven Knohsalla |System Administration > > > > Office +49 631 68036 433 | Fax +49 631 68036 111 > > |E-Mails.knohsalla(a)netbiscuits.com > > |<mailto:s.knohsalla@netbiscuits.com>| > > Skype: Netbiscuits.admin > > > > Netbiscuits GmbH | Europaallee 10 | 67657 | GERMANY > > > > > > > > _______________________________________________ > > 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