On March 11, 2020 9:45:30 AM GMT+02:00, Nardus Geldenhuys <nardusg@gmail.com> wrote:
>Hi Ovirt Mailing-list
>
>Hope you are well. We had an outage over several ovirt clusters. It
>looks
>like we had the same ISO NFS domain shared to all off them, many of the
>VM's had a CD attached to it. The NFS server went down for an hour, all
>hell broke lose when the NFS server went down. Some of the ovirt nodes
>became "red/unresponssive" on the ovirt dashboard. We learned now to
>spilt
>the NFS server for ISO's and/or remove the ISO's when done.
>
>Has anyone seen similar issues with an NFS ISO Domain? Is there special
>options we need to pass to the mount to get around this? Can we put the
>ISO's somewhere else?
>
>Regards
>
>Nardus

Hi Nardus,

The iso domain is deprecated, but there  are some issues  when uploading ISOs to block-based data domains.Using  ISOs uploaded  to gluster-based  data domain is working pretty fine (I'm using it in my LAB),  but you need to properly test prior implementing on Prod.

As far as I know, oVirt is making I/O checks frequently , so even the hard mount option won't help.

Is your NFS  clusterized ? If not ,you may consider clusterizing it.

Actually, did your VMs got  paused  or completely crashed ?

Best Regards,
Strahil Nikolov