We migrated cluster pools from an old iSCSI storage to a new one, and of course we forgot to migrate the SBD partition.
At boot time, the nodes were complaining they found no SBD partition, and naturally we got no NCS.
After boot, no way of creating a new SBD partition or access partitions list thru yast. sbdutil or yast get stuck
I start here a blog on the tribulation of an OES admin, including nice and bad things that happen on the servers.
And it'll start with a nice error "adminfs daemon: Adminusd proc: zero length read."