Yes, if you configure the cluster with networks /storage/etc you can put off the second node to save power:) and loose HA, but every time when you change some thing in a main node you should turn on second one and reinstall it. Healthy node means that ovirt-engine can see that host has a access to storage and all networks are available in order to start the failed VM. The HA function can be configured per VM, and the action what engine should trigger on failure: reboot, pause or poweroff you can choose in the vm settings. On Thu, Nov 2, 2017 at 9:07 PM, Jonathan Baecker <jonbae77@gmail.com> wrote:
Thank you for clarification! Am 02.11.2017 um 20:55 schrieb Arman Khalatyan:
Ovirt HA means that if you have virtual machine running on the ovirts environment(let us say 2 nodes) then if the bare metal gets troubles, VM will be restarted on the second one, the failed host must be fenced: poweroff/reboot, but the HA model assumes that the both bare metal machines are always on and healthy. if second host is off, then simply you dont have HA, you should ask someone to turn on the second host in order to rerun your VMs.:) Usually if you turn off the "healthy host" it does not have any information to sync, the ovirt-engine manages all things.
Ok, then HA is not the right choice.
(Maybe question belongs to the wrong forum?) The ovirt does not contain any sync / HA functionality in the data side. Maybe you are looking for some ha/failover-file systems like a glusterfs(geo-replication) or drbd(real-time replication) or zfs: send receive(smart backups+snapshots) or some thing similar.
When I understand your right, then there is no necessary data on the nodes, all information have the ovirt engine? My VM images are on a nfs share, at the moment. When one node crashes I can just migrate the VM to the second node? That would be wonderful!
On Thu, Nov 2, 2017 at 8:20 PM, Jonathan Baecker <jonbae77@gmail.com> wrote:
Hello everybody,
I would like to sync two nodes, but I want that only one node runs permanently. Only once a week or a month I want to start the second node and sync them again, if this is necessary.
What you would recommend for this scenario? oVirt have a HA functions, what I could use, but I thought oVirt brings then maybe errors when one node is always off. I'm wrong here? Or is there other options what works better?
Have a nice day!
Jonathan
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