Product Fault Management,
Continued
NOTE
Under VMS, the page mapout threshold is
calculated automatically. If "PAGE MAPOUT
THRESHOLD EXCEEDED" is set in SYSTAT, the
failing memory module should be replaced.
In cases of a new memory module used for repair or as
part of system installation, you can elect to replace the
module rather than have diagnostics map them out, even if
the threshold has not been reached for hard single-address
errors.
MULTIPLE ADDRESSES
If the second occurrence of an error within a footprint is
at a different address (LOWEST ADDRESS not equal to
HIGHEST ADDRESS), MULTIPLE ADDRESSES are set in
STATUS along with SCRUBBED. Scrubbing is attempted
for this situation. In most cases, the failing memory module
should be replaced regardless of the page mapout threshold.
If CRD BUFFER FULL is set in LOGGING REASON (located
in the subpacket header) or PAGE MAPOUT THRESHOLD
EXCEEDED is set in SYSTAT, the failing memory module should
be replaced regardless of any thresholds.
For all cases (except when SCRUBBED is the only flag set
in STATUS), isolate the offending memory by examining the
translation in FOOTPRINT called MEMORY ERROR STATUS:
The memory module is identified by its backplane position.
The memory SBE reduction subpacket header translates
the MEMCON register for memory subsystem configuration
information.
Unlike uncorrectable memory and CPU errors, the VMS global
counter, as shown by the DCL command SHOW ERROR, is not
incremented for correctable ECC errors unless it results in an
error log entry for reasons other than system shutdown.
Continued on next page
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