3B2 SCSI Soft Power fun...
Greg A. Woods
woods at robohack.uucp
Thu Jun 27 12:16:18 AEST 1991
I just went through an episode that gave me a good scare.
I came home this evening to find my DM/135e with its power light out
and tons of messages spewing out on the console about a bad block 0 on
that device. Oh-oh! I tried an emergency power down, but it
"failed", so I logged in and tried 'telinit 0' which eventually worked.
When I tried to power back up, only the DCM/4e came on, and not even
the TM/60S! After much goofing around and searching through the
maintenance manual, I finally looked at the SCSI Operations Manual.
A very short paragraph suggested shutting everything off *and*
disconnecting all of the power cables, and starting up from scratch.
It almost worked, but I was getting funny clicks from my new line
conditioner (TrippLite LS-600 b). I also noticed noise on my AM radio
when I removed the power cords from units that were supposedly off.
Ah yes! That wee paragraph said problems might occur if either
someone accidentally powered off a module, *or* if there were
un-expected power transients.
So, I removed the "line conditioner" from the power bar and went
through the disconnect procedure again before everything was stable.
I think I'll leave the line conditioner for some other application,
after I check it's output under load with a scope! Meanwhile, I think
that I'll let those "intelligent" SCSI module power supplies fend for
themselves.
--
Greg A. Woods
woods@{robohack,gate,eci386,tmsoft,ontmoh}.UUCP
+1 416 443-1734 [h] +1 416 595-5425 [w] VE3-TCP Toronto, Ontario; CANADA
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