If you experience such problem .
For example
“ Enclosure, “1″, has detected that a power supply in bay 6 has changed from status OK to Unknown.”

Go to HP and download latest HP BladeSystem c-Class Onboard Administrator Firmware

Note:Before updating enclosure firmware be shure to update all blades ILO to resent version.
If you skip that step you may experience with disconnection problems when connecting to blades.

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