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

Storage Subsystem Commands
SCF Reference Manual for the Storage Subsystem—529937-007
14-67
ALTER DISK Command
SERIALWRITES { ENABLED | DISABLED }
(mirrored volumes only) specifies whether serial writes are used when updating
files.
SQLMXBUFFER number
(SQL/MX volumes only) is the buffer size (in megabytes) for an SQL/MX session.
number is in the range 0 through 768. The default is 0. Do not use this attribute
for TMF audit-trail volumes.
To change the SQLMXBUFFER attribute, first put the disk in the STOPPED state
by using the STOP DISK Command (page 14-148):
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.
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).
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.
ENABLED Perform serial writes if the mirror disk is available. If the primary
or mirror disk is not available, and if FULLCHECKPOINTS
(page 14-57) is ENABLED or FORCED, full-block checkpoints
protect the validity of the data. ENABLED minimizes potential data
loss caused by certain processor error conditions. (Default)
DISABLED Do not perform serial writes unless this attribute has been
specified for a specific file and the mirror disk is available.
DISABLED maximizes the performance of mirrored disks.