Parameter description for CKPTSPACE

BERTNUM=nnnnnn

Start of change Specifies the number (must be no greater than 1000000) of 64-byte block extension reuse tables (BERTs) records that JES2 adds to the checkpoint record. This additional space is a general-purpose checkpointed area to be used to store and extend JOEs and JQEs, CATs, workload management (WLM) queues, and other block extension workspace. JES2 calculates the default as the greater of (JOBNUM + JOENUM/4 + 100) or 399. End of change

If the value specified is too small relative to the number of JOEs and JQEs, JES2 will assign a larger value to reduce the chance of a shortage of BERTs. However, installations should monitor BERT usage (using $D CKPTSPACE,BERTUSE and the $HASP050 message) to ensure they do not run out of BERTs.

Start of change Modification: $T CKPTSPACE command to increase or decrease the number of BERTs. End of change

BERTWARN=nnn|80

Specifies the percentage (1–99) of use of BERTs at which the operator will be alerted by message $HASP050. A value of zero will cause the default value (80) to be set if no value has been specified on a previous start or through $T CKPTSPACE,BERTWARN= command.

Modification:$T CKPTSPACE operator command, JES2 cold start, or All-member warm start.

Note: This parameter cannot be modified through a hot start, quick start, or single-member warm start.