HP 9000 800/G40 battery?/cable

From: Christopher Smith <csmith_at_amdocs.com>
Date: Wed Jan 30 09:40:08 2002

Ok guys,

The only other person I've been able to contact regarding this
HP console cable tells me that there are only 2 pins connected
on his cable too, so I'm going to assume the cable -- since it
works -- is correct. :)

I can still post a "corrected" pin mapping, though.

Anyway, on to the next problem. How does the battery backup
system work?

My understanding is that there's a battery in each PSU, and
when you lose power, those batteries will maintain the RAM
contents. The machine should then resume in-place when the
power comes back. Is this right?

Here is why I'm confused:

The charging light came on when I first plugged the machine
in. It went off a while later. So it seems to think the
battery is charged.

I tried to test this last night, by plugging the system into
a surge bar with a disconnect switch. I booted the system,
ran some programs, and cut the power. After about 20
seconds, I applied power again.

At this point the machine will boot -- noticing, and warning
me that there was a power failure -- and bring the system up
in the normal "hey, you didn't unmount this disk properly"
fashion. As far as I can tell, none of the processes I'd
left running were there.

There is a configurable variable in the kernel -- something
to do with power failure -- I have tried this twice with the
variable set to both 1 and 0.

What am I missing? At this point I'd like to find out whether
it's likely to be operator error before I go poking around for
the batteries. :)



Christopher Smith, Perl Developer
Amdocs - Champaign, IL

/usr/bin/perl -e '
print((~"\x95\xc4\xe3"^"Just Another Perl Hacker.")."\x08!\n");
Received on Wed Jan 30 2002 - 09:40:08 GMT

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