There's no harm in keeping your existing UPS and feeding it from the protected circuit serving the entire room. In the event of failure of the main protected circuit, the 520 UPS will take over and provide for an orderly shutdown. I'm assuming that you have a signal cable attached from your UPS to the 520 and that you have configured what actions to take when a failure occurs.

Keep in mind that your 520 is useless without extending protection to the system console and to the routers and switches that allow users to access it.

We have a large UPS serving the entire computer room backed up with a diesel generator supplied by an underground fuel tank. We can run indefinitely on auxiliary power. The bulk of our users are at remote sites and would be unaware that a utility power failure had occurred.

BTW, it's a good idea to have your auxiliary I/O devices, i.e., tape and optical, and at least one printer on the protected circuit.

Burns, Bryan wrote:
Our network people are getting a quote on putting the server room on one UPS which will feed the entire circuit going into the server room. This includes our IBM 520 which is currently connected to a Powerware 5125 UPS still under warranty. The room will not have a generator. From the iSeries side of things, I don't see any advantage to going to a UPS that will protect 20 other servers.

What precautions do the network guys need to take with respect to the IBM 520? That is, are there any unique UPS requirements for a 520 server versus, let's say a Dell server?
Thanks in advance.

Bryan Burns
iSeries Specialist
IBM Certified Specialist - iSeries System Command Operations M.I.S. Department
ECHO Outdoor Power Equipment

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