I got very fast a lot of hints, thanks to
<alan_at_nabeth.cxo.dec.com>
Davis <Davis_at_Tessco.Com>
Brian Benson <brian_at_kepler.lsmsa.edu>
Brian Parkhurst <brianp_at_u.washington.edu>
Paul Scowen <PAUL.SCOWEN_at_asu.edu>
All agree to a hardware problem and advice me to look for the old CDROM 
and gave several hints what to do.
- have an Ultrix cd floating around you can boot to  (have to look)
- refreshing disk label (chpt)		(don't know original layout)
- rebuild the disk (or a replacement) from backups  (have some)
- having hardware service check the disk	(don't have service)
- t sounds like you lost the first N blocks of your disk where all 
  the partition map information is kept
- if part of / has been lost too then you will need to newfs /
  and restore / from your last backup.
Its now late here, so I will look into it tomorrow in detail.
Thanks and regards
Otto
My original question was:
>On on of my old Ultrix system(V4.2) I get immediately after boot
>
>"bad partion table"	and somewhat later
>"no root file system"
>
>I fear that the system disk is bad. With
>cnfg 3
>on console level I see all disks. But the error stays on also
>with
>boot 3/rz2/genvmunix od vmunix. So I can't do a rzdisk.
>
>What to do best in this situation? 
 -------------------------------------------------------------------------
| Dr. Otto Titze, Kernphysik TU, Schlossgartenstr. 9, D-64289 Darmstadt   |
| titze_at_ikp.tu-darmstadt.de              Tel: +49(6151)16-2916,FAX:16-4321|
 -------------------------------------------------------------------------
Received on Thu Feb 04 1999 - 20:53:47 NZDT