Hi Gert,

are those mounts depending on some network connection (NFS, iSCSI device) or truly local devices? And are you mounting by /etc/fstab (plus systemd generator for the according *.mount units), then please give us a glimpse of the according entry. If those mount units where created explicitly, what's in there? If that mount point is depending on network, please add "_netdev" to the mount options.

Have you followed the logged recommendation to check the journal entries? ("systemctl status db2acc04_zdb2lu12_1B.mount")

A few more details might help...