18 Sun Integrated Lights Out Manager 2.0 Supplement for Sun Fire X4170, X4270, and X4275 Servers • March 2009
How the /SYS/SP/SP_NEEDS_REBOOT Sensor
Works
Like the /SYS/INTSW sensor, the /SYS/SP/SP_NEEDS_REBOOT sensor is asserted
when the server’s chassis intrusion switch is tripped while power is being applied to
the server. Shutting down the server’s host or shutting down the server by pressing
the Power button does not shut down the SP because the SP continues to run when
the server’s power is placed in Standby mode. The only way to remove power from
the SP is to disconnect the AC power cords. To clear this sensor, you must replace
the server’s cover and either reboot or power cycle the SP.
Assertion of the /SYS/SP/SP_NEEDS_REBOOT sensor indicates that the SP has been
placed in a degraded mode of operation. In degraded more, ILOM stops taking
DIMM inventory. This action is taken as a safety precaution because the SP has no
way of knowing the real configuration of the server’s memory. For example, some of
the DIMMs could have been removed while the server’s cover was improperly
removed. To protect against such an occurrence, the SP is placed in the degraded
mode.
Note – If the chassis intrusion switch is not properly aligned or the server’s cover
has not been properly seated, both the /SYS/INTSW and
/SYS/SP/SP_NEEDS_REBOOT sensors will be asserted and the SP will operate in a
degraded mode.
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