When one of the two power supplies to a server is lost does it need to be manually 'reset' or will it automatically start working when power is restored. I can find no documentation about this so I would be very grateful if anyone can help me. The servers I am using are Dell Poweredge 2950, 2900 and 2800.
The reason I'm asking is that our servers are currently powered using standard household extension leads and I want to change then for the more reliable PDU's. I would like to be able to do this without having to switch off the servers.
Best Answer
No "resetting" is required and you don't need to power down the server to change the power cords as long as you change them one at a time. One PS is always active and the other is always passive. When the active PS loses power, the passive PS takes over with no intervention needed on your part. When you switch the cords the currently active PS will go passive and the passive will go active, so the server will never lose power.