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

Storage Subsystem Commands
SCF Reference Manual for the Storage Subsystem—529937-007
14-63
ALTER DISK Command
Specifying fewer than 4 disk processes conserves memory but could decrease
system performance. Specifying more than 4 disk processes requires more
memory but could improve performance. The effect on your system depends on
your applications and the disk traffic they create.
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.
OSSCACHING { ON | OFF }
specifies whether caching for Open System Services (OSS) files is ON or OFF.
The default is ON.
PHYSVOLSELECT { ON | OFF }
specifies whether a virtual disk process can consider this physical volume for file
placement. This attribute is valid only when this physical volume is a member of a
storage pool.
POOL { $pool | EXCLUDE }
specifies whether a physical volume is a member of a specified storage pool.
See Section 9, Configuring and Managing Storage Pools for Magnetic Disks.
PRIMARYCPU number
is the processor in which the primary IOP starts. The process must be in the
STOPPED state or not running for you to alter this attribute.
The processor in which the primary IO process runs and the processor in which the
backup process runs need not be located in the same topology branch.
PRIMARYDEVICEID { number | ( shelf,bay ) }
(45xx and M8xxx disks only) is the device ID of either a nonmirrored disk or of the
primary disk of a mirrored volume.
ON A virtual disk process can consider this physical volume for file
placement (default).
OFF A virtual disk process cannot consider this physical volume for file
placement, regardless of the information supplied in a command.
If PHYSVOLSELECT is OFF, the value of AUTOSELECT
(page 14-54) is ignored.
$pool adds the physical volume to the specified storage pool.
EXCLUDE removes a disk from a storage pool.