Hi, Didi. Thanks for your answer. Unfortunately the suggested command shows the same storage domains as I listed above. The node is in Maintenance (as it would be when Installing an update from the GUI). None of these storage domains are mounted on the node ( at least not visible when running command "mount"), thus I am not able to unmount them. I guess they are visible to the node's OS due to the fact that they are iSCSI domains, even if the node itself makes no use of them. That said, looking at the files listed by the find command you gave me, the storage domains all have links to non-existent /dev/ locations, like the following: /rhev/data-center/mnt/blockSD/0d57fcd3-4622-41cc-ab23-744b93d175a0/dom_md/: total 0 lrwxrwxrwx. 1 vdsm kvm 45 Oct 6 09:36 ids -> /dev/0d57fcd3-4622-41cc-ab23-744b93d175a0/ids lrwxrwxrwx. 1 vdsm kvm 47 Oct 6 09:36 inbox -> /dev/0d57fcd3-4622-41cc-ab23-744b93d175a0/inbox lrwxrwxrwx. 1 vdsm kvm 48 Oct 6 09:36 leases -> /dev/0d57fcd3-4622-41cc-ab23-744b93d175a0/leases lrwxrwxrwx. 1 vdsm kvm 48 Oct 6 09:36 master -> /dev/0d57fcd3-4622-41cc-ab23-744b93d175a0/master lrwxrwxrwx. 1 vdsm kvm 50 Oct 6 09:36 metadata -> /dev/0d57fcd3-4622-41cc-ab23-744b93d175a0/metadata lrwxrwxrwx. 1 vdsm kvm 48 Oct 6 09:36 outbox -> /dev/0d57fcd3-4622-41cc-ab23-744b93d175a0/outbox lrwxrwxrwx. 1 vdsm kvm 49 Oct 6 09:36 xleases -> /dev/0d57fcd3-4622-41cc-ab23-744b93d175a0/xleases ls -l /dev/0d57fcd3-4622-41cc-ab23-744b93d175a0/ids ls: cannot access '/dev/0d57fcd3-4622-41cc-ab23-744b93d175a0/ids': No such file or directory I guess I can remove the export from the iSCSI SAN towards the node, reboot the node and then try to upgrade the node via "dnf update". However, the node will then not be able to serve the storage domains to it's VMs when taken out of Maintenance.