Recently, we placed an order for IBM blades HS21. At the time of quotes, discussions, technical clarifications the line toed by IBM was that the power supply for the chassis is N+N redundant, meaning out of the 2 supplies, if one conked off, the other should comfortably power the blade center in which all slots are populated with fully configured blades .
(Remember, this is an aspect, where IBM & HP fought tooth & nail in public!).
We decided to check this claim. In our case, all the 14 slots were populated with 2 Quadcore Intel procs with 16 Gig RAM and 2 sas disks. When we tried to power on, the chassis refused to power on all blades under "fully redundant" mode. It allowed to power all the blades only in "non-redundant" or "redundant with potential loss of performance". This is apparently because the total power of each supply is 2900 W which is simply not enough to comfortably power all the 14 blades.
The implications for those who want to heavily rely on x86/64+blades+virtualization for their comuting needs may well be guessed. You are warned!
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