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 cards with a failure history are marked ″bad″ to prevent their being configured on subsequent boots.

    a processor or memory card is marked ″bad″ under the following circumstances:

    1 a processor or memory card fails built-in self-test (bist) or power-on self-test (post) testing during boot (as determined by the service processor).

    2 a processor or memory card causes a machine check or check stop during runtime, and the failure can be isolated specifically to that processor or memory card (as determined by the processor runtime diagnostics in the service processor).

    3 a processor or memory card 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 cards that are marked “bad.”

    if a processor or memory card is deconfigured, the processor or memory card 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 card, or re-enabling a previously deconfigured processor or memory card. for information about configuring or deconfiguring a processor, see the processor configuration/deconfiguration menu on page 25. for information on configuring or deconfiguring a memory card, see the memory configuration/deconfiguration menu on page 27. 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.