robert@computing-maths.cardiff.ac.uk (Robert Evans) (03/07/89)
We run Ultrix 2.3 on a VAX 8200. Since upgrading to 2.3 before Christmas,
we've been getting the following type of error on different lines on a dhu11
on our UNIBUS:
----- EVENT INFORMATION SEGMENT -----
EVENT CLASS OPERATIONAL EVENT
OS EVENT TYPE 250. ASCII MSG
SEQUENCE NUMBER 12.
OPERATING SYSTEM ULTRIX 32
OCCURRED/LOGGED ON Sat Mar 4 12:58:57 1989 WET
SYSTEM ID x05282B14
OCCURRED ON SYSTEM v1
MESSAGE dhu0,line9 DHU HARDWARE ERROR.
TX.DMA.START failed
These occur 2 or 3 times a week and cause the line to hang up for an
indeterminate period. Field service have replaced the board twice to
no effect. During these hang-ups, the program "sps" on Ultrix shows
a process trying to write to the terminal line but stuck inside the driver.
(Consequently the process won't kill). As far as I've seen, the process
has been either a terminating login shell or the getty program.
DEC suspect (without evidence so far) a hardware error further up, eg in the
UNIBUS. Anyone know of another explanation?
The list of hardware on the UNIBUS is: Camtec DEXPAND x25 board, controller
for EXABYTE tape, DEUNA, TU80 controller, DHU11, DMF32.
--
Robert Evans, Dept of Computing Maths, University of Wales College of Cardiff,
PO Box 916, Cardiff, Wales, UK, CF2 4YN. Tel: +44 (0)222 874000 x 5518
E-mail: R.Evans@computing-maths.cardiff.ac.uk UUCP: R.Evans@cf-cm.UUCP