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 > UPS(servers,switches,routers)?
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 runtime remaining. > 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. Corey /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
