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Split a UPS

Split a UPS

Split a UPS

Okay I know its probably just cheap cost cutting but am I being foolosh if I run 2 servers off one UPS.
Its got 2 serials and can shut down both systems

Paul O'Connor

RE: Split a UPS

You aren't being foolish but...

If you have a BIG UPS (and I mean BIG) then you can get away with it. Work out the load of both servers (total wattage) being drawn. Add to that a monitor (if the power goes and you can't check the servers...) and then divide it into the UPS storage to get the number of minutes you have until the battery dies. Can you live with that?

We work on 20 minutes of battery power and the servers go off after 12 (cos Exchange takes FOREVER to shut down).

RE: Split a UPS


The new server I'll be adding to the existing UPS is an Exchange Box.
My estimates are that we will have an equal split of about 20 minutes.
How long do you guess a Dual PIII 500 1 GB ram Exchange Box will need

Paul O'Connor

RE: Split a UPS

Some of the pro-grade UPS's are designed to support multiple servers. I ran a Best 5.1KW ferrups, ran my whole server room on it - one server has the serial link to the UPS, runs FERRUPS, which enables monitoring of all ups parameters on the server screen, and will initiate a shutdown NLM when battery power reaches a set number of minutes remaining - it also sends out a signal across the network, and other servers running NETWATCH receive the signal and initiate their own shutdown NCF files. They probably support NT similarly.

Fred Wagner

RE: Split a UPS


If it is a standard power supply and it is only the processor unit you are supporting then you are running 230V in the UK or 120V in the US. On the PSU you should see the number of Watts it uses (around 250W). Add both processor boxes Watts together. Add any monitors you wish to use similarly to arrive at a total consumption (let's say 500W cos you won't put monitors on it and will be using auto shut down software).

Look at the UPS or its documentation. It will give you a total battery capacity for instance 1KWh. This means 1000 Watts for one hour. Or 500W for two hours. i.e. you can last 2 hours without power. Shut off with at least 10 minutes left. More if using Exchange (see above post).

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