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Notes:
1. If the wrong diskette is inserted at any time, or if the diskette is left in the drive after it has been read,
B1FD 001F is displayed, indicating that the wrong diskette is in the drive.
2. If B1FD 001A is displayed at any time during the process, the service processor must be reset by
activating the pinhole reset switch on the primary drawer operator panel.
After the update process is complete, the service processor resets itself and goes through a complete
reboot.
Configuring and Deconfiguring Processors or Memory
All failures that crash the system with a machine check or check stop, even if intermittent, are reported as
a diagnostic callout for service repair. To prevent the recurrence of intermittent problems and improve the
availability of the system until a scheduled maintenance window, processors and memory DIMMs with a
failure history are marked "bad" to prevent their being configured on subsequent boots. This function is
called repeat gard.
A processor or memory DIMM is marked "bad" under the following circumstances:
v A processor or memory DIMM fails built-in self-test (BIST) or power-on self-test (POST) testing during
boot (as determined by the service processor).
v A processor or memory DIMM causes a machine check or check stop during runtime, and the failure
can be isolated specifically to that processor or memory DIMM (as determined by the processor runtime
diagnostics in the service processor).
v A processor or memory DIMM reaches a threshold of recovered failures that results in a predictive
callout (as determined by the processor run-time diagnostics in the service processor).
During boot time, the service processor does not configure processors or memory DIMMs that are marked
"bad."
If a processor or memory DIMM is deconfigured, the processor or memory DIMM remains offline for
subsequent reboots until it is replaced or repeat gard is disabled. The repeat gard function also provides
the user with the option of manually deconfiguring a processor or memory DIMM, or re-enabling a
previously deconfigured processor or memory DIMM.
For information about configuring or deconfiguring a processor, see the Processor
Configuration/Deconfiguration Menu on page 206. For information about configuring or deconfiguring a
memory DIMM, see the Memory Configuration/Deconfiguration Menu on page 207. Both of these menus
are submenus under the System Information Menu. You can enable or disable CPU Repeat Gard or
Memory Repeat Gard using the Processor Configuration/Deconfiguration Menu.
Run-Time CPU Deconfiguration (CPU Gard)
L1 instruction cache recoverable errors, L1 data cache correctable errors, and L2 cache correctable errors
are monitored by the processor run-time diagnostics (PRD) code running in the service processor. When a
predefined error threshold is met, an error log with warning severity and threshold exceeded status is
returned to AIX. At the same time, PRD marks the CPU for deconfiguration at the next boot. AIX will
attempt to migrate all resources associated with that processor to another processor and then stop the
defective processor.
Chapter 7. Using the Service Processor
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