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

Storage Subsystem Commands
SCF Reference Manual for the Storage Subsystem—529937-007
14-78
ALTER PROFILE Command
AUTOSTART { ON | OFF }
(internal and M8xxx disks only) specifies whether to automatically start the disk
process when the disk is inserted.
DISK AUTOSTART ON is ignored if SUBSYS AUTOSTART is OFF.
For information about using this attribute, see Mirrored Disk Placement on
page 6-12.
CBPOOLLEN number
is the maximum memory (in 128-KB units) that can be allocated for open-related
data structures for the disk. The memory available for these structures limits the
total number of concurrent opens allowed on the disk. number is in the range 0
through 1000. The default is 1000.
You can increase the value of this attribute while the disk is in the STARTED state.
However, to decrease the value of this attribute, the disk must be in the STOPPED
state. As a result, this attribute value cannot be decreased for the system disk
unless you load the system from a saved system configuration database that
contains a smaller value for this attribute.
FSTCACHING { ON | OFF }
specifies that the free-space table (FST) for a disk is updated in memory (ON), that
the FST is updated on disk (OFF) or that DP2 decides whether to keep the FST in
memory or on disk (ENABLED). The default is OFF. FSTCACHING ON can
increase performance. The FST is always rebuilt from disk when the disk is
started.
The system disk always runs with FSTCACHING ON regardless of the configured
value.
FULLCHECKPOINTS { ENABLED | DISABLED | FORCED }
(nondirectory structured files only) specifies when to perform full-block
checkpoints.
ON Enable automatic starting (default).
OFF Disable automatic starting.
DISABLED Never use a full-block checkpoint to protect the data on the disk.
Using DISABLED maximizes disk performance, but risks
corrupting data blocks on the disk.
ENABLED Use a full-block checkpoint only when serial writes are not being
performed. Use ENABLED on disks that perform parallel writes
and on nonmirrored disks. For more details, see the
SERIALWRITES attribute on page 14-83. (Default)
FORCED Always use full-block checkpoint for disk-write operations.