User`s guide

System Troubleshooting and Diagnostics
5.2 Product Fault Management and Symptom-Directed Diagnosis
A few other errors of the sort considered nonrecoverable are present.
• Disable cache(s) permanently if error threshold is exceeded.
• Flush and re-enable those caches which have been marked as good.
• Clear the error flags.
• Perform Return from Exception or Interrupt (REI) to recover and restart or
continue the instruction stream for the following situations:
Most INT54 errors.
Those INT60 and INT54 errors which result in bad ECC written to a
memory location. (These errors can provide clues that the problem is
not memory related.)
Machine check conditions where instruction retry is possible.
Memory uncorrectable ECC error where page replacement is possible
and instruction retry is possible.
Threshold exceeded (for cache errors only).
Return from Subroutine (RSB) and return from all polled errors.
Note
The results of the OpenVMS error handler may be preserved within
the operating system session (for example, disabling a cache) but not
across reboots.
Although the system can recover with cache disabled, the system
performance will be degraded, since access time increases as available
cache decreases.
5.2.3 OpenVMS Error Logging and Event Log Entry Format
The OpenVMS error handler for the kernel can generate six different entry
types, as shown in Table 5–1. All error entry types, with the exception of
correctable ECC memory errors, are logged immediately.
5–6 System Troubleshooting and Diagnostics