User guide

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Troubleshooting
This chapter provides general troubleshooting information focusing on problems that might occur
with the blade enclosure. Read users guides and manuals of modules including CPU blades and
peripheral equipment as well. If descriptions in them are different from what is described here,
follow the instructions in those manuals.
Power supply
If the POWER LED of a CPU blade is not lit in green although you turned on it, check:
• The power supply control unit such as uninterruptible power supply is switched on.
• The power distribution board is switched on.
• The power cords are securely connected to the blade enclosure.
• The power cords of the blade enclosure are securely connected to a power-supply tap.
• The power-supply tap cord is securely installed on the uninterruptible power supply (UPS).
• The power units are securely installed on the blade enclosure.
• The number of power units installed on the blade enclosure is appropriate or not.
• The redundancy mode of the power supplies on the blade unit is appropriate.
• The CPU blade is securely installed on the blade enclosure.
Check the following when remote power-on via network does not work. (Wake on LAN does not
work):
• Haven't you just used the forceful power-off? (The function to forcefully power off the CPU
blade by keeping pressing the power switch of the CPU blade for four or more seconds)
• Wake on LAN does not work after the forceful power-off is performed. Perform a regular shut
down process after starting the CPU blade once, or power-off the AC switch and then power it on
again. Before powering off the AC switch, make sure that other CPU blades are not operating.
This also applies when the DC of CPU blade is normally powered off on the BIOS/EFI window.
• Haven't you sent a Magic Packet right after you powered off the AC power?
• Allow one minute after AC power starts to be supplied to CPU blade. If you attempt a start by
Wake on LAN within one minute from the AC power starts to be supplied, the CPU blade may
not be powered on. (It takes about one minute from start of the AC power supply to initialization
of BMC on the CPU blade.)