DL380/360 G5 Redundant Power Supplies

[Sandy Young (2)]

We are configuring a new rack system which will have 4 DL380 and 4 DL360 servers. The configurator says we should use one R12000 with 2 ERMs (for 1 hour).

We are considering two R5500 (with ERMs) with redundant power supplies in the servers, and having each R5500 connected to each server.
This would (we believe!) prevent the failure of one UPS bringing the system down.

There seems to be little documentation on such topics - any advice much appreciated.

[FrankM_1]

Hi.
You may go to:
http://www.upssizer.com/

[Sandy Young (2)]

Have had a good look round the configurator stuff but yet to find anything which discusses the merits (and methods) of using two ups units and two power supplies per server.
Suspect there must be something on this topic - after all if trying to avoid a single point-of-failure two UPS must be better than one.

[DennisCThornton]

I've used dual UPSs and dual PS servers for several years in this way. I also use an ATS (automatic transfer switch) for single corded devices.

The only caveat (other than cost) is you must make sure a single UPS has the capacity for all your equipment and that you test occasionally.

It has avoided down time in a couple instances.

[DennisCThornton]

Another point - make sure the UPSs are on separate circuits. Doing so help reduce the risk of someone accidently throwing a circuit breaker.

In one instance we lost one phase of the power coming into our building. As one of the UPSs was on the other phase we had enough time to move the one UPS over to another live circuit (it's good to have an extension cord).