Mr Aharon, Thank you for an expedient reply. Your suggestions pointed me in the right direction. I was concentrating on the Hosts when it was the storage I should have paid more attention to. It seems that if any one of the Storage Domains is not connecting properly, the system refuses to restore. It turns out that after the power failure, an inconspicuous server had not come up properly. It had the ISO Domain and an unused Data Domain which was still attached. These caused the failure. BZ to you sir and good day. Thank you On 06/25/2017 06:54 PM, Elad Ben Aharon wrote: Hi, Which types of storage do you have in the data center? In case it's a block based storage (iSCSI/FC), check that the devices (LUNs) where you domains reside are accessible though multipath and LVM: # multipath -ll # pvs # vgs In case it's a file based storage (NFS/GlusterFS), check that the storage domain file system is mounted under /rhev/data-center/mnt # mount | grep '/rhev/data-center' On Sun, Jun 25, 2017 at 11:29 AM, JC Clark <jc(a)mcsaipan.net&gt; wrote: > Dear All, > > Is there a reason that a perfectly well working Ovirt 4.1 Engine after a > power failure, would not allow the hosts to activate because of "VDSM > ConnectStorageServerVDS failed". All firewalls are down, I have > reinstalled the host, upgraded everything (host and engine), deleted and > reinstalled hosts, I can ssh to all from all. Any clues?? > > Thanks ahead of time.. > > -- > Warm Regards, > JC Clark > IT Director > Mount Carmel School > Saipan, CNMI > > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > -- Warm Regards, JC Clark IT Director Mount Carmel School Saipan, CNMI (670) 235-6272 office(670) 483-8684 cell