Eagle hang

[Brian Kantor]

> 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 at ucsd.arpa
	akgua  >---  sdcsvax  --- brian
	ucbvax/		Kantor at Nosc