SCF Reference Manual for the Storage Subsystem (G06.24+, H06.03+)

Storage Subsystem Commands
SCF Reference Manual for the Storage Subsystem—529937-007
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ALTER PROFILE Command
For mirrored volumes, FULLCHECKPOINTS is important only if the primary or
mirror disk is not up. In that situation, FORCED or ENABLED can protect the
validity of data written to the disk.
When performing full-block checkpoints, the primary process checkpoints the data
to the backup process before writing to the disk. This action ensures that the data
on the disk is not corrupted even if a hardware freeze or processor halt occurs
during a disk write.
Use FORCED or ENABLED unless data loss is not critical.
HALTONERROR number
specifies whether an internally detected, unrecoverable, disk-process error forces
a halt (code %11500) in the primary processor, backup processor, or both. Forced
processor halts also halt the respective disk process. Forced processor halts can
provide more information at the time of a failure. To force a halt when a failure is
detected, set number to either 2, 3, or 4.
number is one of the following:
If an unrecoverable disk-process error is detected but the processor is not halted,
the disk processes perform these actions:
•
If the backup disk process detects the error, the disk state remains unchanged
and the backup disk process goes into a soft-down state but does not halt.
The primary disk process continues to function without an active backup.
•
If the primary disk process detects the error, it gives ownership of the disk to
the backup disk process. If the ownership change is successful, the primary
disk process becomes a soft-down backup. (The process is not available.) If
1 Never halt a processor (default).
No processor halts, and the primary or backup disk process that detects an
unrecoverable disk-process error can go into the STOPPED state, substate
DOWN.
2 Never halt the backup processor.
The primary processor halts, but the backup disk process can go into the
STOPPED state, substate DOWN, if it detects an unrecoverable disk-
process error.
3 Never halt the primary processor.
The backup processor halts, but the primary disk process can go into the
STOPPED state, substate DOWN if it detects an unrecoverable disk-
process error.
4 Allow both processors to halt.
Both the primary and backup processors can halt if either detects an
unrecoverable disk-process error.