Sorin Srbu wrote:
The voltage has been fairly constant here over the years since I started using UPS and logging the voltage and stuff, 238V more or less constantly. It rarely drops below 236V or over 240V. We mainly use the UPS:es to have controlled shutdowns should the power fail entirely - We had some issues a few years back while they built a new school the other side of the road when the power went up and down for a uyear or so, and the diesel-generators didn't start up as expected. This whole building where I work is supposed to be a wartime hospital with power-backups up to yinyang. But it failed when we needed them... #=;-(
It's a tough thing to get right. I've been involved with several systems and they all failed a time or two in initial testing even after everyone thought they should work. And then things break after that...
It might be that the power is too high, although the standard is 240V in Europe AFAIK. Or the UPS-units *may* have been rated for the previous lower voltage-level at 220V, but that sounds a bit farfetched IMO. Unless the units were a (very much) older batch that APC dumped on us...
Another issue can be that you aren't backing up the air conditioner power, so when the grid goes down your still-running equipment overheats, damaging the electronics. This is particularly likely if your servers are racked densely in a small space.
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf
Of
Les Mikesell Sent: Tuesday, February 03, 2009 6:42 PM To: CentOS mailing list Subject: Re: [CentOS] Emergency rescue help needed
hospital with power-backups up to yinyang. But it failed when we needed them... #=;-(
It's a tough thing to get right. I've been involved with several systems and they all failed a time or two in initial testing even after everyone thought they should work. And then things break after that...
The building was built in the 50s, so I guess it's not a testing thing, but rather the second thing you mention. Breakage due to not-too-frequent-use.
Another issue can be that you aren't backing up the air conditioner power, so when the grid goes down your still-running equipment overheats, damaging the electronics. This is particularly likely if your servers are racked densely in a small space.
Yeah, it got awfully hot in the basement server room... We don't don’t have any racks though, almost all servers are tower models not too densely packed. About 3-4 per shelf in two rows and two-three shelves in total. The AC is rather over-dimensioned, but when the power is out, it doesn't really matter... 8-/
The good part is that we haven't had any significant power-outs for over two years. Temporary dips and the occasional spike and flicker yes, but no total unplanned black-out.
-
Les Mikesell -
Sorin Srbu