Hi, We have a dev cluster running 4.2. It had to be powered down as the building was going to loose power. Since we've brought it back up it has been massively un-stable (Hosts constantly switching state, VMs migrating all the time). I now have one host running (with HE) and all others in maintenance mode. When I try activate another host i see storage errors in vdsm.log 2019-05-07 09:41:00,114+0000 ERROR (monitor/a98c0b4) [storage.Monitor] Error checking domain a98c0b42-47b9-4632-8b54-0ff3bd80d4c2 (monitor:424) Traceback (most recent call last): File "/usr/lib/python2.7/site-packages/vdsm/storage/monitor.py", line 416, in _checkDomainStatus masterStats = self.domain.validateMaster() File "/usr/lib/python2.7/site-packages/vdsm/storage/sd.py", line 941, in validateMaster if not self.validateMasterMount(): File "/usr/lib/python2.7/site-packages/vdsm/storage/blockSD.py", line 1377, in validateMasterMount return mount.isMounted(self.getMasterDir()) File "/usr/lib/python2.7/site-packages/vdsm/storage/mount.py", line 161, in isMounted getMountFromTarget(target) File "/usr/lib/python2.7/site-packages/vdsm/storage/mount.py", line 173, in getMountFromTarget for rec in _iterMountRecords(): File "/usr/lib/python2.7/site-packages/vdsm/storage/mount.py", line 143, in _iterMountRecords for rec in _iterKnownMounts(): File "/usr/lib/python2.7/site-packages/vdsm/storage/mount.py", line 139, in _iterKnownMounts yield _parseFstabLine(line) File "/usr/lib/python2.7/site-packages/vdsm/storage/mount.py", line 81, in _parseFstabLine fs_spec = fileUtils.normalize_path(_unescape_spaces(fs_spec)) File "/usr/lib/python2.7/site-packages/vdsm/storage/fileUtils.py", line 94, in normalize_path host, tail = address.hosttail_split(path) File "/usr/lib/python2.7/site-packages/vdsm/common/network/address.py", line 43, in hosttail_split raise HosttailError('%s is not a valid hosttail address:' % hosttail) HosttailError: :/ is not a valid hosttail address: Not sure if it's related but since the restart the hosted_storage domain has been elected the master domain. I'm a bit stuck at the moment. My only idea is to remove HE and switch to a standalone Engine VM running outside the cluster. Thanks, Alan