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

MAXLOCKSPERTCB number
is the maximum records and files that a transaction can lock. number is in the range 0 through
1,000,000. The default is 5000.
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.
Using large values for MAXLOCKSPERTCB can have a noticeable performance impact. The
volume may become non-responsive for several seconds or more, based on how many locks
are acquired during a transaction. The impact becomes significant when more than 100,000
locks are being released, and becomes larger in direct relationship to MAXLOCKSPERTCB.
Delays may vary between 2 seconds for 150,000 locks to 20 seconds for 500,000. During
this time, other applications or system processes may experience timeouts due to the extended
response time of the volume. Applications should avoid obtaining 100,000 or more locks
within a transaction on a regular basis.
MBACKUPCLIM clim-name
is the name of the CLIM that controls the mirrored backup path to the disk.
NOTE: This attribute is not valid for the PROFILE object.
MBACKUPDEVICEID { number | ( shelf, bay ) }
(45xx and M8xxx Fibre Channel disks only) is the device ID of the disk accessed on the mirror
backup path to the disk
NOTE: This attribute is not valid for the PROFILE object.
This attribute is optional. If specified, it must be the same device ID that you specified for
theMIRRORDEVICEID attribute.
For 45xx disks:
is the unit number of the disk. number is in the range 1 through 7.number
For M8xxx Fibre Channel disks:
is the FCDM’s shelf number. shelf is in the range 1 through 4.shelf
is the number of the disk. bay is in the range 1 through 14.bay
If you configure a disk volume for use with an FCSA connected to an ESS, you cannot specify
MBACKUPDEVICEID.
MBACKUPLOCATION ( group, module, slot )
(mirrored 45xx and mirrored M8xxx disks only) is the location of the adapter that controls
the mirror backup path to the disk
NOTE: This attribute is not valid for the PROFILE object.
This attribute is optional if MBACKUPSAC is given in name format, but required if given in
number format.
MBACKUPPORTNAME number
specifies the Fibre Channel port name (WWN) used by the backup path to a mirror disk on
the Enterprise Storage System (ESS)
NOTE: This attribute is not valid for the PROFILE object.
206 Storage Subsystem Commands