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 books with a failure history are marked 2bad2 to prevent their being configured on subsequent boots.

    a processor or memory book is marked 2bad2 under the following circumstances:

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

    3 a processor or memory book 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 books that are marked “bad.”

    if a processor or memory book is deconfigured, the processor or memory book 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 book, or re-enabling a previously deconfigured processor or memory book. for information on configuring or deconfiguring a processor, see the processor configuration/deconfiguration menu on page 33.

    for information on configuring or deconfiguring a memory book, see the memory configuration/deconfiguration menu on page 35. 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.