Subject: Archive 4586NP woes
To: None <current-users@NetBSD.ORG, firstname.lastname@example.org>
From: VaX#n8 <email@example.com>
Date: 07/23/1998 02:47:30
Tape Drive Questions:
Drive: Archive/Python/Seagate 4586NP 4mm tape changer
I have been noticing some strange behavior.
First, the documentation I was given (in the form of some
photocopied sheets) is rather lacking. In fact, the SCSI ID
jumper settings were left-right reversed. This cost me quite
a bit of time to figure out.
After the drive writes to a tape, it won't respond
to the Open/Close button (or the Step button, for that matter)
until the tape has been ejected, even if the tape is rewound.
Is this normal?
On various occasions, I have witnessed the green "cassette" LED
to blink slowly, or the amber "drive" LED to blink quickly.
What do these mean?
Hardware or OS questions:
Controller: based on NCR 53c810
OS: a recent NetBSD (>= 1.3)
Upon rewind, the drive retains exclusive access to the SCSI bus.
I can think of three explanations:
1) The drive does not support disconnect/reconnect.
2) The controller does not support disconnect/reconnect.
3) The OS does not support disconnect/reconnect.
Furthermore, if the "offline" command is given, and the drive
does a long rewind, unload, reloads the next tape, and there
are significant accesses to the SCSI bus during this time,
the machine does a hard reboot.
Typical system logs are:
... ncr0: timeout ccb=0xf0874000 (skip)
... st1(ncr0:6:0): non-media hardware failure, data = 00 00 00 00 44 bc 00 3c 00 00
... st1(ncr0:6:0): not ready, data = 00 00 00 00 00 00 00 00 00 00
The timeout is by far the most frequent.
I also had problems with the machine logging a line mentioning
a timeout, and the CCB being dequeued. This frequently led to
a hung SCSI bus. Thoughts?
Paranoia is underrated.