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. 
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