$T CKPTSPACE - Set the checkpoint space
Function
To modify information about the amount of space in the checkpoint.
Syntax
Parameters
- BERTNUM=bertnum
- The number
(200–2,500,000) of BERT (Block Extent Reuse Table) entries defined in the checkpoint. The
lower limit when decreasing this value is based on the number of JOEs and JQEs defined on the
system. In addition, you cannot decrease it below the number of BERTs that are in use. For example,
if BERT 23176 is the highest BERT in use, then 23177 is the lowest you can reduce BERTNUM to. This
is true even if 23175 is not currently in use. Likewise, you cannot increase the
BERTNUM parameter to a value below the number of BERTs that are defined on
the system. You must specify a BERTNUM value that is between the
system-calculated minimum and the system-defined maximum. Specifying a value that is too low results
in an HASP003 message with the lowest valid value
displayed.Note: Use this parameter to increase the limit for the JNUM resource that is reported on the HASP050 message.
- BERTWARN=bertwarn
- The threshold of BERT utilization at which the $HASP050 message should be issued. The valid range is 1 to 100.
- CDINUM=cdinum
- The number (16-65536) of the configuration directory entries (CDIs) defined in the JES2 checkpoint. The default is 128. The number can be increased (if JES2 checkpoint size is sufficient for expansion) or decreased. The number cannot be decreased below current number of CDIs in use (CDINUM minus CDIFREE as displayed by $D CKPTSPACE command). To decrease the number, all CDI entries above the specified number must be free, even if CDIFREE shows sufficient number of unused CDIs.
Authority Required
This command requires system authority. The description of the $T RDRnn command explains how to ensure that the authority of the appropriate MVS™ system command group is assigned.
This command requires control security access authority. For a description of assigning command input authority, see z/OS JES2 Initialization and Tuning Guide.
Scope
MAS-wide. The command has an effect across the entire MAS.
Messages
The $HASP852 message displays the current values of all the parameters on the CKPTSPACE initialization statement.
Example
1
$t ckptspace,bertnum=650
$HASP852 CKPTSPACE
$HASP852 CKPTSPACE BERTNUM=650,BERTFREE=497,BERTWARN=80,
$HASP852 CKPT1=(CAPACITY=1788,UNUSED=1431,
$HASP852 TRACKS=150),CKPT2=(CAPACITY=1788,
$HASP852 UNUSED=1431,TRACKS=150),CDI=(CDINUM=128,
$HASP852 CDIFREE=128,CDTSIZE=524264,CDTFREE=524264)