User manual

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-1130SHDW-LNK (Memory Shadowing Link)
10
■ Requests the Standby SPE Maintenance/Tape Processor to hold the
Standby SPE Processor reset.
■ Enables shadowing from Active SPE Memory to Standby SPE Memory and
causes all of Active SPE Memory to be written to Standby SPE Memory (a
refresh operation).
For a flash-based system:
■ Disables shadowing from Active SPE Memory (MEM-BD) to Standby SPE
Memory.
■ Requests the Standby SPE Maintenance/Tape Processor (PR-MAINT) to
release the Standby SPE processor (PROCR) for the Standby SPE
Processor to clear a magic area in Standby SPE Memory.
■ Requests the Standby SPE Maintenance/Tape Processor to hold the
Standby SPE processor reset.
■ Enables shadowing from Active SPE Memory to Standby SPE Memory and
causes all of Active SPE Memory to be written to Standby SPE Memory (a
refresh operation).
■ Disables shadowing from Active SPE Memory to Standby SPE Memory.
■ Requests the Standby SPE Maintenance/Tape Processor to release the
Standby SPE Processor for the Standby SPE Processor to perform a
verification on the magic area in Standby SPE Memory (just updated by
the refresh operation).
■ Requests the Standby SPE Maintenance/Tape Processor to hold the
Standby SPE Processor reset.
■ Enables shadowing from Active SPE Memory to Standby SPE Memory and
causes all of Active SPE Memory to be written to Standby SPE Memory (a
refresh operation).
NOTE:
The shadowing verification method used for 80386 systems does not
do a complete RAM checksum. It only clears a special magic area in
the Standby SPE’s memory and then updates that area by
shadowing. It then verifies the value in that magic area based on the
Active SPE’s value. Thus, the test is not as comprehensive in terms
of testing the memory aspect of shadowing as is the 80286 method.
The reason for this is the inability to shadow flash memory.