System Troubleshooting and Diagnostics
5.2 Product Fault Management and Symptom-Directed Diagnosis
STATUS contains a record of the failure mode status of a particular DRAM
over time. This in turn determines whether or not the CRD buffer is
logged. For the first occurrence of an error within a particular DRAM, the
memory location will be scrubbed (corrected read data is read, then written
back to the memory location) and CRD CNT will be set to 1. Since most
memory single-bit errors are transient due to alpha particles, logging of
the CRD buffer will not be done immediately for the first occurrence of an
error within a DRAM. The CRD buffer will, however, be logged at the time
of system shutdown (operator or crash induced), or when a more severe
memory subsystem error occurs.
If the FOOTPRINT/DRAM experiences another error (CRD CNT > 1),
the OpenVMS operating system will set HARD SINGLE ADDRESS or
MULTIPLE ADDRESSES along with SCRUBBED in STATUS. Scrubbing
is no longer performed; instead, pages are marked bad. In this case, the
OpenVMS operating system will log the CRD buffer immediately. The CRD
Buffer will also be logged immediately if PAGE MAPOUT THRESHOLD
EXCEEDED is set in SYSTAT as a result of pages being marked bad. The
threshold is reached if more than one page per Mbyte of system memory is
marked bad.
Note
CURRENT ENTRY will be zero in the Memory SBE Reduction
subpacket header if the CRD buffer was logged, not as a result of
a HARD SINGLE ADDRESS or MULTIPLE ADDRESSES error
in STATUS, but as a result of a memory uncorrectable ECC error
shown as RELATED ERROR, or as a result of CRD BUFFER FULL
or SYSTEM SHUTDOWN, all of which are shown under LOGGING
REASON.
5.2.4 OpenVMS Operating System Event Record Translation
The kernel error log entries are translated from binary to ASCII using the
ANALYZE/ERROR command. To invoke the error log utility, enter the DCL
command ANALYZE/ERROR_LOG.
Format:
ANALYZE_ERROR_LOG [/qualifier(s)] [file-spec] [,...]
Example:
$
ANALYZE/ERROR_LOG/INCLUDE=(CPU,MEMORY)/SINCE=TODAY
System Troubleshooting and Diagnostics 5–15
