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Assuming you have a HP c-Class enclosure....
I'm guessing you have your power configuration wrong in general you have 3 choices between AC redundant, Power Supply redundant and no redundancy.
Have a close look in your Onboard Administrator web interface under Power and Thermal -> Power Management for what is most suitable based on your power usage in Power and Thermal -> Power Meter.
Also check the model numbers of all your power supplies. I've seen an issue in a c-Class enclosure with 4 power supplies, 2 of one model number and 2 of another, where in certain combinations the power meter would display the current usage as something ridiculous like 14MW, though still showing the power limit at the normal level.
Of course as always, make sure both your OA firmwares and your blade iLO firmwares are fully up to date.
"Can you ask them how, if you have half empty enclosure, with four power supplies, removing just one PSU will cause the whole enclosure to reboot?..." Because you don't know how to configure the power in the OA? If you only have four PSUs and yet have eight blades I would suggest you check you don't have the power redundancy set as n+n. There used to be an online power calculator configuration checker thingummy on the hp website for such questions.
"....,Because my boss would like to know how I took out four important servers by unplugging just one power cable." Because he didn't buy enough PSUs? I'd also check how many fans you have, whether you actually have enough in the chassis, as he probably bought the base chassis with four PSUs and four fans and has been adding blades without adding fans and/or PSUs.
Agreed... Its such a shame though. Blades should have been the next evolution of the rack, if only they standardised them! I brought an IBM Blade Chassis in 2006, it was a Data Center in a 7u box with 6 Servers, SAN, 2 Load Balancer, 2 GbE switches, 4 power supplies, and the only connectivity it require was 2 uplink network cables and the power cables..
Roll on 2012 and an infrastructure refresh, I replaced the chassis with 6 pizza boxes, 4 switches, 2 Load Balancer, Firewalls and SAN, requiring approx 50+ Cat6 Cables, 10 ethernet cables, 22 power cables, 12 Fibre channel cables... shit, just the SAN alone is the size of the Blade Chassis (EMC VNX 5300, taking up 7U)...
/me crying!
For how long, really and truthfully, do HP keep a stock of blade midplanes and can customers subscribe to an up-to-date feed of stock held related to their supported hardware?
It is not fun when the 4 hour part replacement turns into weeks to source a proprietary midplane.
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