tensai at zmonkey.org
Tue Jun 26 12:42:44 MDT 2012
On 06/26/2012 12:00 PM, Kyle Waters wrote:
> Due to nearby construction we have had a couple of power outages
> recently and I've been asked to evaluate our batter backup system(we are
> not able to put generators in place currently). I have a few questions
> for other regarding there batter back up systems.
> What is a reasonable expectation for a rack mountable UPS to continue to
> supply power during a power outage?
> How much equipment do you generally put on one
These two questions are very closely related. The more equipment on a
single UPS, the less runtime. The more batteries, the longer it runs but
the bigger it gets and the more rack space it eats. It's a tradeoff
between $$ and time, so decide how much you can afford.
Just for comparison, I have some places that have generator backup and
the UPSes only need to last 10-20 minutes. Other sites are on the top of
mountains and their UPSes last 8-10 hours.
> Any software you have found that works well with CentOS to shut down the
> servers at the appropriate time?
Not specifically, but we like the APC management cards. They're easy to
tie into whatever monitoring solution you have (*cough* Zenoss *cough*).
In fact, just now I'm going through a power outage at a remote site and
I know that the AC is out, the battery is at 36% and it has 60 minutes
> How frequently should UPS be tested? How should they be tested?
More often than they actually get tested.
> How frequently do you replace batteries/UPS' due to failure?
Not frequently enough.
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