Login over ssh to the SPM, then trigger the Activate button and then copy the vdsm log (last one) from the host.
Also check with 'multipath -ll  36005076300808894600000000000000a' if all hosts have the multipath device  and it's status is good.
oVirt refuses to activate if it can't mount a file-based storage (NFS, Gluster) or access the LV on the block-based storage domains (FC, iSCSI,etc).

Also in the vdsm logs of the SPM should have a clue why it fails to activate.

I'm not sure if oVirt uses SCSI reservations or not, but it's worth checking).

Best Regards,
Strahil Nikolov

On Thu, May 5, 2022 at 16:36, Nyika Csaba
<csabany@freemail.hu> wrote:
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