SCF Reference Manual for the Storage Subsystem (G06.27+, H06.04+)

Storage Subsystem Commands
SCF Reference Manual for the Storage Subsystem—529937-008
14-24
Disk Attribute Descriptions
NONAUDITEDINSERT { ON | OFF }
(magnetic disks) specifies whether nonaudited insert mode is enabled (ON) or
disabled (OFF).
NUMDISKPROCESSES number
is the number of disk processes allocated for the disk. number is in the range 1
through 8. The default is 4.
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.
ON enhances performance by buffering insertions to entry-sequenced
files or relative-sequenced files that do not have the REFRESH
attribute set and are open with a SYNCDEPTH greater than 0. This
feature is known as nonaudited insert mode.
However, the resulting reduction in the frequency of label updates
potentially increases the probability of data loss in the event of a
double disk failure.
OFF disables nonaudited insert mode (default). This option forces write
inserts, which increase EOF.
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 14-14) is ignored.