Hitachi Compute Blade 2000 User Manual page 84

 I/O board module
A Power LED (PWR)
Lights solid green when main power is turned on.
B Attention LED (ATN)
Lights solid orange when the I/O board module fails.
C Attention button (ATN)
Used for hot-inserting or hot- removing the I/O board module.
Note: This hot-plug function is currently not supported. To obtain information on
when the hot-plug function will be supported, consult your reseller.
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