Hi I have removed the iso domain of an existing data center, and now I am unable to create a new iso domain /var/log/ovirt-engine/engine.log shows: 2022-07-14 08:04:40,684+02 INFO [org.ovirt.engine.core.bll.storage.connection.AddStorageServerConnectionCommand] (default task-34) [8db814e3-43ab-4921-ad35-2b3acd51c385] Lock Acquired to object 'EngineLock:{exclusiveLocks='[ovirt.storage.inf.ethz.ch:/export/ovirt/iso=STORAGE_CONNECTION]', sharedLocks=''}' 2022-07-14 08:04:40,689+02 WARN [org.ovirt.engine.core.bll.storage.connection.AddStorageServerConnectionCommand] (default task-34) [8db814e3-43ab-4921-ad35-2b3acd51c385] Validation of action 'AddStorageServerConnection' failed for user xxx@ethz.ch@ethz.ch-authz. Reasons: VAR__ACTION__ADD,VAR__TYPE__STORAGE__CONNECTION,$connectionId c39c64ef-fb8b-4e87-9803-420c7fb2dd4a,$storageDomainName ,ACTION_TYPE_FAILED_STORAGE_CONNECTION_ALREADY_EXISTS 2022-07-14 08:04:40,690+02 INFO [org.ovirt.engine.core.bll.storage.connection.AddStorageServerConnectionCommand] (default task-34) [8db814e3-43ab-4921-ad35-2b3acd51c385] Lock freed to object 'EngineLock:{exclusiveLocks='[ovirt.scratch.inf.ethz.ch:/export/ovirt/iso=STORAGE_CONNECTION]', sharedLocks=''}' 2022-07-14 08:04:40,756+02 INFO [org.ovirt.engine.core.bll.storage.connection.DisconnectStorageServerConnectionCommand] (default task-34) [4148e0fd-58ae-4375-8dc8-a08f47402ed6] Running command: DisconnectStorageServerConnectionCommand internal: false. Entities affected : ID: aaa00000-0000-0000-0000-123456789aaa Type: SystemAction group CREATE_STORAGE_DOMAIN with role type ADMIN 2022-07-14 08:04:40,756+02 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.DisconnectStorageServerVDSCommand] (default task-34) [4148e0fd-58ae-4375-8dc8-a08f47402ed6] START, DisconnectStorageServerVDSCommand(HostName = ovirt-node01, StorageServerConnectionManagementVDSParameters:{hostId='d942c8fe-9a0c-4761-9be2-2f88b622070b', storagePoolId='00000000-0000-0000-0000-000000000000', storageType='NFS', connectionList='[StorageServerConnections:{id='null', connection='ovirt.storage.inf.ethz.ch:/export/ovirt/iso', iqn='null', vfsType='null', mountOptions='null', nfsVersion='null', nfsRetrans='null', nfsTimeo='null', iface='null', netIfaceName='null'}]', sendNetworkEventOnFailure='true'}), log id: 3043bbfd 2022-07-14 08:04:43,017+02 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.DisconnectStorageServerVDSCommand] (default task-34) [4148e0fd-58ae-4375-8dc8-a08f47402ed6] FINISH, DisconnectStorageServerVDSCommand, return: {00000000-0000-0000-0000-000000000000=100}, log id: 3043bbfd [root@ovirt-engine ovirt-engine]# showmount -e ovirt.storage.inf.ethz.ch | grep ovirt Export list for ovirt.scratch.inf.ethz.ch: /export/ovirt/export @ovirt-storage /export/ovirt/data @ovirt-storage /export/ovirt/iso @ovirt-storage the other two domains still work just fine and the netgroup contains all ovirt-nodes. storage-node1[0]:/export/ovirt/iso# ls -la total 2 drwx------. 2 vdsm kvm 2 Jul 14 07:58 . drwxr-xr-x. 5 root root 5 Aug 19 2020 .. storage-node1[0]:/export/ovirt/iso# df . Filesystem 1K-blocks Used Available Use% Mounted on fs1/ovirt/iso 524288000 256 524287744 1% /export/ovirt/iso storage-node1[0]:/export/ovirt/iso# storage-node1[0]:/export/ovirt/iso# exportfs -v | grep ovirt/ -A1 /export/ovirt/iso @ovirt-storage(sync,wdelay,hide,no_subtree_check,fsid=215812,sec=sys:krb5:krb5i:krb5p,rw,secure,root_squash,no_all_squash) /export/ovirt/data @ovirt-storage(sync,wdelay,hide,no_subtree_check,fsid=215811,sec=sys:krb5:krb5i:krb5p,rw,secure,root_squash,no_all_squash) -- /export/ovirt/export @ovirt-storage(sync,wdelay,hide,no_subtree_check,fsid=215813,sec=sys:krb5:krb5i:krb5p,rw,secure,root_squash,no_all_squash) It appears that there is stille some reference to an iso domain (c39c64ef-fb8b-4e87-9803-420c7fb2dd4a ??) in the database. How can I get rid of it ? Best Moritz