henry@utzoo.UUCP (Henry Spencer) (11/26/84)
We had an odd bit of misbehavior from one of our Eagles today: it hung,
with the READY light off, not doing anything. Furthermore, when we tried
shutting it down, it wouldn't response to the front-panel switch! Flipping
the START switch off did nothing; the START light stayed on, and there was
no sound of the disk shutting down. We finally pulled the circuit breaker
for a moment. On powering it back up, it seems fine. Does anybody know
what gives?
[Before you ask, we did look at the LEDs in the back. But it's been so
long since we had to bother, we forgot that useful information can be
extracted by manipulation of the STATE switch. The URDY light was on,
the ONCYL light was off, none of the other LEDs was on (nor was the
front-panel FAULT light), and the numeric display, in state 2, was
showing 6d as opposed to the normal 65.]
If it's relevant, the Eagles are about 9 months old and are on an SC31
controller on an 11/44 running pretty-much-V7.
--
Henry Spencer @ U of Toronto Zoology
{allegra,ihnp4,linus,decvax}!utzoo!henrybrian@sdcc3.UUCP (Brian Kantor) (11/28/84)
> We had an odd bit of misbehavior from one of our Eagles today: it hung, > with the READY light off, not doing anything. Furthermore, when we tried > shutting it down, it wouldn't response to the front-panel switch! Flipping > the START switch off did nothing; the START light stayed on, and there was > no sound of the disk shutting down. We finally pulled the circuit breaker > for a moment. On powering it back up, it seems fine. Does anybody know > what gives? > Henry Spencer @ U of Toronto Zoology I've had the eagle on our sun network do that a couple of times - each time I had to power the system down (both the drive and the cpu). I think its due to random signals on the control lines as both the drive and controller powered up - I have never had it occur if either was already on. Toggling the circuit breaker (main power) on the eagle always fixes the problem. I imagine a power surge (especially if the grounding between your eagle and cpu isn't real great, or if you are running the cpu off isolated power and not running the eagle on the same supply) could cause the same effect. Could that have been it? Lightning striking nearby? Brian Kantor UC San Diego decvax\ brian@ucsd.arpa akgua >--- sdcsvax --- brian ucbvax/ Kantor@Nosc