Problems with Exabyte on a DECsystem 5400
Mart Mennen
rcmart at rwc.urc.tue.nl
Fri Jun 7 23:17:32 AEST 1991
A few months ago we installed a SI59-Exabyte unit of the manufacturer
System Industries on our DEcsystem 5400.
The SI59-Exabyte is connected to the Q-bus via their QS1000 controller,
which emulates a TK50. The Exabyte unit is driven by the standard DEC
tmscp driversoftware. We are running Ultrix 4.0 and in addition to the
SI59 we have 3 RA-disks, 1 TU81+ tape unit and 1 TK70 cartridge unit on
the DECsystem 5400.
These devices are configured in the Ultrix kernel as follows:
adapter uba0 at nexus?
adapter msi0 at nexus?
adapter ibus0 at nexus?
controller uda0 at uba0
controller uq0 at uda0 csr 0172150 vector uqintr
disk ra0 at uq0 drive 0
disk ra1 at uq0 drive 1
disk ra2 at uq0 drive 2
controller klesiu0 at uba0
controller uq16 at klesiu0 csr 0174500 vector uqintr
tape tms0 at uq16 drive 0 # TK70
device ln0 at ibus? vector lnintr
controller klesiu1 at uba0
controller uq17 at klesiu1 csr 0160404 vector uqintr
tape tms1 at uq17 drive 0 # TU81
controller klesiu2 at uba0
controller uq18 at klesiu2 csr 0160444 vector uqintr
tape tms2 at uq18 drive 0 # Exabyte
Until now we did not succeed to use the SI59-Exabyte without causing the
system to panic once in a while!
We use the "dump|dd"- and "dd|restore"-pipecommand and the tar command
for writing and reading to/from the SI59-Exabyte.
The problem does not show up immediately, but often occurs after
successfully writing for 1-2 hours.
The most occuring system panic was:
cpu 0 panic: mscp_dealloc_rspid: sequence number mismatch
Before this system panic a lot of mscp messages are reported in the
errorlog, which all look like:
mscp_message: dropping msg: mp c3d2d440, op a1, RSPID 4f60044
getpeername: Bad file number
mscp - resynching controller uq18
mscp_dealloc_rsid: error rtp->rspid 50f0044, rp->rspid 4f60044
The remainder of the panics consisted of:
cpu 0 panic: trap
cpu 0 panic: unaligned access
cpu 0 panic: m_free has bad m_cltype
In the meantime the firmware of the QS1000 controller was upgraded, but
didn't solve any of the above problems!
At the moment we don't dare to use this Exabyte unit anymore....
So, we are interested to know if there are any users who have succeeded
to get the SI59 to work on a DECsystem 5400 or similar DEC system.
Perhaps someone has a clou why it doesn't work on our system.
Secondly, are there users of DECsystem 5400's, which successfully use
Exabyte units of other vendors?
If this is the case, could you give me some information about these
vendors and their Exabyte product(s)?
Thanks in advance for your time and help.
--
Mart Mennen, Eindhoven University of Technology
Computing Centre 1.99, +31 40 472164
P.O.Box 513, 5600 MB Eindhoven, The Netherlands
E-Mail: rcmart at urc.tue.nl
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