SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)

To change the SQLMXBUFFER attribute, first put the disk in the STOPPED state by using the
“STOP DISK Command” (page 290):
• If you specify too large or small a value, DP2 automatically sets the needed size.
• If you specify a value of 0, DP2 automatically sets the size of the buffer to 128.
• If SQL/MX is not installed, setting this attribute to 16 allows DPS to increase DP2 cache
to its maximum.
STARTSTATE { STARTED | STOPPED }
specifies whether the IOP is available to other processes (STARTED) or unavailable (STOPPED)
when the system is loaded or reloaded. The default is STARTED.
SWAPMIRROR
specifies that the data path attributes (LOCATION, SAC, DEVICEID, PORTNAME, LUN) of the
PRIMARY path should be swapped with the MIRROR path, and the data path attributes of the
BACKUP path should be swapped with the MBACKUP path. No other data path attributes can
be specified when SWAPMIRROR is used
NOTE: This attribute is not valid for the ADD DISK command and the PROFILE object.
SWAPMIRROR can be done online if all 4 paths are UP, or if 2 paths are UP in a symmetrical
pattern (P and M, B and MB, P and B, or M and MB).
TYPE { MAGNETIC | VIRTUAL }
is the type of disk you are adding. The default is MAGNETIC
NOTE: This attribute is not valid for the ALTER DISK command and the PROFILE object.
VOLNAME $vol
is the default volume name for the disk. This name is used when the system first tries to start
the volume. This attribute changes the volume name on the label of the disk but does not change
the system configuration database
NOTE: This attribute is not valid for the ADD DISK command and the PROFILE object.
To use this attribute, see “Changing Either the Volume Name or Alternate Volume Name”
(page 90).
WRITECACHE { ENABLED | DISABLED }
specifies whether write caching is enabled for a volume.
specifies that write caching is enabled for a volume.ENABLED
specifies that write caching is disabled for a volume (default).DISABLED
• Write caching can improve disk performance.
• This attribute is available only on J06.03 and subsequent J-series RVUs.
• This attribute affects only CLIM-connected SAS disk drives. It is ignored for all other disks.
• If a volume is configured with WRITECACHE enabled, HP strongly recommends that the
volume be protected by an HP rack mount UPS, which will give the drives enough time to
write cached data to the media after the processor stops writing in the event of power
loss. See “Write Caching” (page 94) for details about why an HP rack mount UPS is
necessary.
• The SUBSYS attribute UPS should be ON either before WRITECACHE is enabled or before
the IOP is started. Otherwise, the IOP will run with WRITECACHE disabled.
214 Storage Subsystem Commands