Mailinglist Archive: opensuse (2496 mails)

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Re: [opensuse] UPS And Multiple Computers
  • From: James Knott <james.knott@xxxxxxxxxx>
  • Date: Mon, 01 Dec 2008 12:47:51 -0500
  • Message-id: <49342347.6020601@xxxxxxxxxx>
Randall R Schulz wrote:
On Monday 01 December 2008 08:31, James Knott wrote:
Randall R Schulz wrote:

Seeing the recent mention of UPS (on the thread "Of software RAID
on SUSE Linux") a question came to mind:

If you have multiple computers, how does one get them to all
initiate the desired actions when main power fails and the UPS
takes over?

Randall Schulz
... Of course, with the cost of a UPS these days, why not have one
for each computer, especially since the more computers you have on the
UPS, the shorter time it will support them.

I thought of that, too, but presumably any given amount of energy storage is going to cost less if it comes in a single package with a single set of the other (non-battery) hardware, right?

In theory. However once you move into a larger UPS, you move out of cheap consumer level devices. Industrial quality costs a lot more. For example, my employer sells a 1000 VA UPS for $228. For that amount, I could buy 3 550VA or 2 750 VA units at the local office supply store. At that same store, a 1000 VA UPS sells for more than twice what we charge. Of course, running multiple computers off the same UPS requires they be close enough to do so. You can of course get much larger systems, to support an entire office, but then you're talking a *LOT* of money. (Last year I was at one site that had a IIRC 300 KVA UPS to power a police headquarters communications system.)

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