Re: On UPS monitoring

Beef wrote:
Our neighborhood had another power outage today. PSE&G seems to have
trouble with this... Every two weeks or so, there is a brown or black
out.

Usually, the UPS takes care of the very short outages (often under three
seconds), but today the power was off for about half an hour.

My UPS is an APC Back-UPS ES 350; when fully charged, this should power
my system for 43 minutes, if I can believe the log file:

[snip]

But today, this didn't wuite happen.

The power went out, I saw a message that shutdown was initialized, then
nothing much happened.

By hand, I quickly quit processes that were using the external discs and
unmounted them. I logged out of terminals.

I tried to start a console session as root, but couldn't, so that part of
things (blobking new log-ins) was working.

But the UPS gave out before the shutdown was complete.

Is this a problem with apcupsd badly reporting the charge left, or with
shutdown now going through the steps quickly enough? How can I find out?


I still use the PowerChutePlus-4.5.3-2 program because the others do not
work well for me in Red Hat Enterprise Linux 3 and CentOS 4.2.

In my experience, if the battery in your UPS is over about three years old,
you should seriously consider replacing it, or severely cutting down the
expected run time.

On a system such as RHEL 3, it takes a few minutes (though less than 5) to
get the system shut down, so you better tell it to shut down when you have,
say, 10 minutes left.

Also, while the powerchute software has a means to test the remaining run
time, it does not work very well. The only really good way is to get
everyone off the machine, shut down non-critical daemons, and then pull the
plug from the wall, and wait.

--
.~. Jean-David Beyer Registered Linux User 85642.
/V\ PGP-Key: 9A2FC99A Registered Machine 241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 07:10:00 up 21 days, 9:30, 3 users, load average: 4.34, 4.30, 4.18
.

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