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 DISK Command
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:
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 the
ownership change is unsuccessful, the disk volume goes into the STOPPED
state, substate DOWN.
•
If both processes enter a soft-down state, the volume enters the STOPPED
state, substate DOWN.
To restore the backup disk process:
1. Issue a RESET DISK command to ensure that all paths start.
2. Issue a START DISK command to reactivate the backup disk process.
If the RESET or START command fails, you must reload the backup processor.
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.