On March 11, 2020 11:35:52 AM GMT+02:00, Nardus Geldenhuys <nard...@gmail.com> 
wrote:
>Hi
>
>Thanks for the response. Seems that they got paused, all came right
>after
>the NFS server came backup.
>
>Regards
>
>Nardus
>
>On Wed, 11 Mar 2020 at 11:34, Strahil Nikolov <hunter86...@yahoo.com>
>wrote:
>
>> On March 11, 2020 9:45:30 AM GMT+02:00, Nardus Geldenhuys <
>> nard...@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
>>

In such case , you can consider  clusterization of the NFS Server if it is 
Linux-based one.

Best Regards,
Strahil Nikolov
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