> Came in this morning and put a tape in the tape drive. 10 minutes
later
> all hell breaks loose. Turns out tlz06 on scsi0 was issuing bus
resets
> caused by cam errors, loads of errors for all devices on scsi0 in the
> uerf.
>
> The question is what is DEC SIM? and should I be concerned about the
> other errors on the bus (I am assuming they were caused by the
resets).
>
> ----- EVENT INFORMATION -----
>
> EVENT CLASS ERROR EVENT
> OS EVENT TYPE 199. CAM SCSI
> SEQUENCE NUMBER 836.
> OPERATING SYSTEM DEC OSF/1
> OCCURRED/LOGGED ON Fri Feb 19 07:59:17 1999
> OCCURRED ON SYSTEM bourn1
> SYSTEM ID x00050009 CPU TYPE: DEC 2100
> SYSTYPE x00000000
> PROCESSOR COUNT 3.
> PROCESSOR WHO LOGGED x00000000
>
> ----- UNIT INFORMATION -----
>
> CLASS x0022 DEC SIM
> SUBSYSTEM x0000 DISK
> BUS # x0000
> x0028 LUN x0
> TARGET x5
Thanks to Dr. Tom Blinn and Bryan Lavelle of DEC,
Bryan mysteriously hit the nail on the head, the problem was indeed
caused by a dirty tape drive during peak demand on the same bus as the
system disk.
Both pointed me in the direction of DECevent, I have to upgrade very
soon and hence will be using it in the future.
Responses follow:
You aren't going to get anything really useful from the uerf output.
The
executable is out of date and will remain that way. You can download
DECevent (dia) from:
ftp://ftp.service.digital.com/private/DECevent/current_ot/unix/diau290.t
ar
This may lead you in a more useful direction than uerf. Bus reset are
generally a bad thing and can regularly be seen where your backup tape
device is on the same bus as your system device, during periods of high
activitiy (like a backup of the system disk). Could easily be a bad
device
or dirty tape drive.
Bryan
I would have to double check, but I believe "DEC SIM" in that context
means
"Digital Equipment Corporation SCSI Interface Module". We build our
SCSI to
work using the CAM (Common Access Method) interfaces. Some of the terms
you
see in the "uerf" output are really not clear, because it was designed
as a
tool for trained service personnel, who usually know the answers to
questions
like the one you are asking.
The DEC SIM interfaces to disk, tape, and other SCSI devices. In this
case,
the error was on a DISK at bus 0 , unit 5, so it would have been
recorded on
your disk rz5. It's probably also caused by the tape problems. Bad
devices
on a SCSI bus can cause other devices to log errors. A bus reset while
the
disk is in operation would certainly do that.
Tom
Received on Fri Feb 19 1999 - 15:05:35 NZDT