UPS troubles

[ferretmaster]

I have been tasked with connecting PDU's to the UPS in our offices. Can anyone tell me how many PDU's i can plug into one UPS. The UPS is a APC 3000. The Ups will have servers plugged into it, the servers are HP proliants, can anyone tell me with the dual PSU's in the servers should i be plugging one PSU into the UPS and one into a wall socket?

Any help would be much appreciated.

 

[iaind]

You can plug as many PDUs as you like into the UPS but obviously the total load can't exceed the rated current of the PDU or UPS (probably 13A).

With dual PSUs, you have a few options. If you are using software to shut the servers down when the power fails, your UPSs need to be synchronised so if power to one fails then it wont shut the server down unless the input to the other fails too. If you connect both to one UPS, you risk the server going down if the UPS fails (pretty unlikely though)

With just one UPS I'd be inclined to plug both into the UPS because they also do conditioning/surge protection of the AC (undervoltage/overvoltage etc) and the chances of a UPS failing completely is pretty unlikely.