Comment # 15 on bug 1230345 from Thomas Blume

(In reply to Ruediger Oertel from comment #13)
> not sure if this helps:
> 
> s390zl21:~ # l /dev/mapper/
> total 0

Ah, it seems it had wrong assumptions about your disk layout.
It seems that your zipl config (normally mounted at /boot/zipl) resides on a
separate device and not as usual on a partition on the system root device.
Therefore zipl assumes the ipl device is 3600507630bffd2160000000000002000

> 3600507630bffd2160000000000002000 -> ../dm-1
> lrwxrwxrwx  1 root root       7 Sep  9 16:26

It looks like system root rather resides on:

> 3600507630bffd2160000000000002100 -> ../dm-2
> lrwxrwxrwx  1 root root       7 Sep  9 16:26

because there are the partitions:

> 3600507630bffd2160000000000002100-part1 -> ../dm-5
> lrwxrwxrwx  1 root root       7 Sep  9 16:26
> 3600507630bffd2160000000000002100-part2 -> ../dm-6
> lrwxrwxrwx  1 root root       7 Sep  9 16:26
> 3600507630bffd2160000000000002100-part3 -> ../dm-7

Rudi can you confirm that?

I never did an installation with /boot/zipl on a separate disk.
Maybe doing so can reproduce the issue.