Sun Microsystems Netra CT 410, Руководство по обслуживанию

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C-10 Netra CT Server Service Manual • February 2007
C.3.2 Soft Hang
Message
Interrupt Level 4--Not serviced
Cause
This message, occurring continuously, signals a soft hang of the system. The
presenting symptom is that the system is noticeably sluggish because it is busy
processing interrupts.
A soft hang occurs when a component such as a power supply sends a level high
interrupt and keeps it high. The kernel notices and polls the devices. Each device
answers negatively, including the culprit power supply. Meanwhile, the CPU
continues with minimal work before returning to the querying process. This error
condition is a serious problem because the failing component remains unidentified.
Action
Completely power the server off, then on again using the instructions in Chapter 2 .
When the system boots, it always boots interrupts low (masked), and attaches the
drivers one by one. Use OpenBoot PROM commands to probe the components and
determine which one has failed.