User`s guide

System Troubleshooting and Diagnostics
5.2 Product Fault Management and Symptom-Directed Diagnosis
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. In Example 5–6, SIMM memory modules in locations 0A
and 0B are identified as failing.
The Memory SBE Reduction Subpacket header translates the MEMCON
register ( ) for memory subsystem configuration information.
Unlike uncorrectable memory and CPU errors, the OpenVMS 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.
Note
If footprints are being generated for more than one memory module,
especially if they all have the same bit in error, the processor module,
backplane, or other component may be the cause.
Note
One type of uncorrectable ECC error, that due to a ‘‘disown write’’,
will result in a CRD entry like those for correctable ECC errors.
The FOOTPRINT longword for this entry contains the message
‘‘Uncorrectable ECC errors due to disown write’’. The failing module
should be replaced for this error.
5–24 System Troubleshooting and Diagnostics