Had a similiar problem only on a 3575 library with 35750 drives.  Problem 
worked out to be with robot.  Needed to be recalibrated ...

Larry Way
SL09/100D
408-743-4242  voice
408-743-4201  fax

>>> bth AT CLARKSON DOT EDU 02/22/00 01:12PM >>>
Hi everyone...
I and my IBM CE have been pulling our hair out on this one for almost a
week...

Whenever my 3494lib w/ 2x 3590 B1A drives mounts a tape (to do a
migration, for example), it shortly produces a WRITE error (errorno=78),
and marks the tape 'read-only'.  I'm running ADSM 3.1.2.40 on an H70
running AIX 4.3.2 The atape, atldd, and 3590 microcode are to current
levels.

This problem started as intermittent on one drive, and now has progressed
to the point where I can't write anything to tape anymore on either drive.

We have tried replacing the 18m SCSI cables, re-routing the SCSI cables,
replacing both SCSI adapters, both terminators, and both 3590 card packs,
all with no change in results.

IBM hardware support says it's a software problem, ADSM support says it's
a hardware problem... Anyone have any ideas?  I'm sweating big time
because I'll run out of disk space upon which to do my backups soon
if I can't move the data off to tape! :-(

Thanks in advance!


-
Best regards,
Best regards,
Brian

+-----------------------------------------------------------------------+
| Brian T. Huntley                         Systems and Network Engineer |
| Campus Information Services, Clarkson University                      |
| Ph/FAX: 315.268-2292/6570                                             |
| bth AT clarkson DOT edu                                 www.clarkson.edu/cis |
+-----------------------------------------------------------------------+
 UNIX *is* user friendly. It's just selective about who its friends are.
        PGP Public Key available. finger bth AT clarkson DOT edu