Hmmm thank you for that, it does make a lot of sense. I've had a look in via the IMM and can't really see anything to disable/enable when it comes to alerts
The 3690 has a 2U PSU that can take 4 canisters. We have only put 2 in. There aren't any blanks(I wasn't aware you could get any), only the little square fillers that connect on the end, but there aren't any switches pressed down when they go in, so I'm not sure how it would know the difference
Thank you for your help, I'll see if the IBM redbooks have anything for me