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IBM Power 595 Technical Overview and Introduction
Figure 4-7 Schematic of an FIR implementation
Fault isolation
The service processor interprets error data captured by the FFDC checkers, which is saved in
the FIRs and
who’s on first
logic or other firmware-related data capture methods, to
determine the root cause of the error event.
Root cause analysis can indicate that the event is recoverable, meaning that a service action
point or need for repair has not been reached. Alternatively, it could indicate that a service
action point has been reached, where the event exceeded a predetermined threshold, or was
unrecoverable. Based on the isolation analysis, recoverable error threshold counts can be
incremented. No specific service action is necessary when the event is recoverable.
When the event requires a service action, additional required information is collected to
service the fault. For unrecoverable errors or for recoverable events that meet or exceed their
service threshold—meaning a service action point has been reached—a request for service
is initiated through an error logging component.
4.3.4 Diagnosing problems
Using the extensive network of advanced and complementary error detection logic built
directly into hardware, firmware, and operating systems, the IBM POWER6 processor
systems can perform considerable self diagnosis.
Boot time
When an IBM POWER6 processor system powers up, the service processor initializes
system hardware. Boot-time diagnostic testing uses a multi-tier approach for system
validation, starting with managed low-level diagnostics supplemented with system firmware
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E r r o r C h e c k e r s
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