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

Storage Subsystem Commands
SCF Reference Manual for the Storage Subsystem—529937-007
14-68
ALTER DISK Command
To use this attribute, see Changing Either the Volume Name or Alternate Volume
Name on page 6-29.
WRITEVERIFY { ON | OFF }
specifies whether the disk process should enable persistent write verify. This value
affects all disk paths that share the same SAC.
When you set WRITEVERIFY ON, you give up some system performance for a
higher level of data integrity. WRITEVERIFY ON is sometimes set automatically by
the disk process if it detects a specific error situation that needs the extra
protection.
ALTER DISK Examples for Magnetic Disks
See the procedure for Altering Magnetic Disk Attribute Values on page 6-22.
•
To change the alternate volume name of a disk from $DATA00 to $SPARE99:
-> ALTER $DATA00, ALTNAME $SPARE99
•
To change the volume name of a disk from $DATA00 to $SPARE00 and delete all
files from the disk:
-> ALTER $DATA00, LABEL $SPARE00
•
To change the default volume name of a disk from $DATA00 to $SPARE98:
-> ALTER $DATA00, VOLNAME $SPARE98
•
To change the revive configuration for a magnetic disk:
-> ALTER $DATA03, REVIVEPRIORITY 40, REVIVERATE 100.
Cache Configuration Example
See the procedure for Configuring the Size of Disk Cache on page 6-23.
•
To change the cache configuration for a magnetic disk:
-> ALTER $DATA00, CACHE ( (512,4), (2K,100), (4K,100) )
•
To change the cache configuration of a disk:
-> ALTER DISK $DATA00, CACHE ( (512,640), (1K, 800), &
-> (2K,500), (4K,20400) )
ON The SAC performs additional verification to ensure that data is written
error-free.
OFF No additional verification is performed (default).