Re: [ovirt-users] Ovirt resilience policy / HA
Hi Darell, Sorry for my late reply. I've been able to test the 2 different scenarios : - Host not responding => Host fenced => HA VMs restarted on another Host. - Host not operational => Host not fenced, resilience policy configured to "Migrate Virtual Machines" => All VMs migrated to another Host. Thank you very much for your answer. Kind regards, Le 2015-03-17 14:59, Darrell Budic a écrit : Resilience policy refers to migration behavior only. if VDSM on a host node detects a storage or network problem, for instance, it will migrate All, HA, or no VMs to a new node. Sounds like you’re thinking in terms of “I want Ovirt to restart these VMs if the host dies”, for that, set HA on the VMs you want it to restart if the VM dies for whatever reason. On Mar 16, 2015, at 3:34 PM, Guillaume Penin wrote: Hi all, I'm building a test ovirt (3.5.1) infrastructure, based on 3 ovirt nodes and 1 ovirt engine. Everything runs (almost) fine, but i don't exactly understand the interaction between resilience policy (Cluster) and HA (VM). => What I understand, in case of host failure : - Setting resilience policy to : - Migrate Virtual Machines => All VMs (HA and non HA) will be started on another host. - Migrate only Highly Available Virtual Machines => HA VMs only will be started on another host. - Do Not Migrate Virtual Machines => HA and non HA VMs won't be started on another host. => In practice : - No matter what parameter i use in resilience policy, HA VMs only will be started on another host in case of a host failure. Is this the expected behaviour ? Am I misunderstanding the way it works ? Kind regards, ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Ovirt resilience policy / HA
Le 2015-03-18 11:18, Omer Frenkel a écrit : - Original Message - From: "Guillaume Penin" To: users@ovirt.org Sent: Monday, March 16, 2015 10:34:54 PM Subject: [ovirt-users] Ovirt resilience policy / HA Hi all, I'm building a test ovirt (3.5.1) infrastructure, based on 3 ovirt nodes and 1 ovirt engine. Everything runs (almost) fine, but i don't exactly understand the interaction between resilience policy (Cluster) and HA (VM). => What I understand, in case of host failure : - Setting resilience policy to : - Migrate Virtual Machines => All VMs (HA and non HA) will be started on another host. - Migrate only Highly Available Virtual Machines => HA VMs only will be started on another host. - Do Not Migrate Virtual Machines => HA and non HA VMs won't be started on another host. => In practice : - No matter what parameter i use in resilience policy, HA VMs only will be started on another host in case of a host failure. Is this the expected behaviour ? Am I misunderstanding the way it works ? there are 2 types of host failure: 1 - power/network/vdsm service.. - these leads to a state where engine and host cannot communicate, host will move to 'non-responsive' and will be fenced (power mgmt action) in this case, only HA vms will be restarted, once the engine is sure it is safe. 2 - software issues like storage connectivity - in this case, engine can communicate with the host, and decide it is not fulfilling the cluster/dc requirements the host will move to 'not operational' then the engine will live-migrate (not restart) vms according to your choice of resilience policy so what did you do when you tested 'host failure'? according to your question i assume number 1, and this is what you got let me know if it helps Omer. Hi Omer, Indeed, I only tested the "Non responsive" scenario with a power failure. The host was fenced and only HA VMs were restarted which was, as you said, the correct behaviour in this case. I've just tested the "Not operational" scenario by "ifdowning" a network interface. Resilience policy was configured to "Migrate Virtual Machines" and as expected, all VMs have been migrated to another host. Thank you very much for that clarification. Kind regards, ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Ovirt resilience policy / HA
- Original Message - > From: "Guillaume Penin" > To: users@ovirt.org > Sent: Monday, March 16, 2015 10:34:54 PM > Subject: [ovirt-users] Ovirt resilience policy / HA > > Hi all, > > I'm building a test ovirt (3.5.1) infrastructure, based on 3 ovirt nodes > and 1 ovirt engine. > > Everything runs (almost) fine, but i don't exactly understand the > interaction between resilience policy (Cluster) and HA (VM). > > => What I understand, in case of host failure : > > - Setting resilience policy to : > > - Migrate Virtual Machines => All VMs (HA and non HA) will be > started on another host. > - Migrate only Highly Available Virtual Machines => HA VMs only will > be started on another host. > - Do Not Migrate Virtual Machines => HA and non HA VMs won't be > started on another host. > > => In practice : > > - No matter what parameter i use in resilience policy, HA VMs only > will be started on another host in case of a host failure. > > Is this the expected behaviour ? Am I misunderstanding the way it works > ? > there are 2 types of host failure: 1 - power/network/vdsm service.. - these leads to a state where engine and host cannot communicate, host will move to 'non-responsive' and will be fenced (power mgmt action) in this case, only HA vms will be restarted, once the engine is sure it is safe. 2 - software issues like storage connectivity - in this case, engine can communicate with the host, and decide it is not fulfilling the cluster/dc requirements the host will move to 'not operational' then the engine will live-migrate (not restart) vms according to your choice of resilience policy so what did you do when you tested 'host failure'? according to your question i assume number 1, and this is what you got let me know if it helps Omer. > Kind regards, > ___ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
[ovirt-users] Ovirt resilience policy / HA
Hi all, I'm building a test ovirt (3.5.1) infrastructure, based on 3 ovirt nodes and 1 ovirt engine. Everything runs (almost) fine, but i don't exactly understand the interaction between resilience policy (Cluster) and HA (VM). => What I understand, in case of host failure : - Setting resilience policy to : - Migrate Virtual Machines => All VMs (HA and non HA) will be started on another host. - Migrate only Highly Available Virtual Machines => HA VMs only will be started on another host. - Do Not Migrate Virtual Machines => HA and non HA VMs won't be started on another host. => In practice : - No matter what parameter i use in resilience policy, HA VMs only will be started on another host in case of a host failure. Is this the expected behaviour ? Am I misunderstanding the way it works ? Kind regards, ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
