MAXCOPYPOOLTASKS: Specifying the maximum number of concurrent DFSMSdss invocations for each fast replication command

Explanation: MAXCOPYPOOLTASKS is an optional parameter that you use to define the maximum number of DFSMSdss invocations for each fast replication command that DFSMShsm can concurrently process. FRBACKUP tasks: The maximum number of concurrent fast replication backup volume tasks is the product of the FRBACKUP and DSS parameters. FRRECOV tasks: The maximum number of concurrent fast replication recover volume tasks is the product of the FRRECOV and DSS parameters.

Note: When the FRBACKUP COPYPOOL command uses FlashCopy consistency groups, DFSMShsm processes all the copy pool volumes in one DFSMSdss invocation, regardless of the SETSYS MAXCOPYPOOLTASKS(FRBACKUP(nn) DSS(nnn)) setting.

Subparameter	Explanation
FRBACKUP	MAXCOPYPOOLTASKS (FRBACKUP(nn)) is an optional parameter that you specify to define the maximum number of DFSMSdss invocations for each FRBACKUP command that DFSMShsm can concurrently process. For nn, substitute a decimal number from 1 to 64 to represent the number of DFSMSdss invocations for each FRBACKUP command that runs concurrently.
FRRECOV	MAXCOPYPOOLTASKS (FRRECOV(nn)) is an optional parameter that you specify to define the maximum number of DFSMSdss invocations for each FRRECOV command that DFSMShsm can concurrently process. For nn, substitute a decimal number from 1 to 64 to represent the number of DFSMSdss invocations for each FRRECOV command that runs concurrently.
DSS	MAXCOPYPOOLTASKS (DSS(nnn)) is an optional parameter that you specify to define the maximum number of volume pairs that DFSMShsm passes to each DFSMSdss invocation for backup and recover functions. For nnn, substitute a decimal number from 1 to 254 to represent the number volume pairs that DFSMShsm passes to each DFSMSdss invocation.

SMS relationship: Parameter differs in meaning when applied to SMS-managed or non-SMS-managed DASD volumes or data sets.

SETSYS default: None.

DFSMShsm default: If you do not specify this parameter on any SETSYS command, the DFSMShsm default for the FRBACKUP parameter is 15 tasks, the FRRECOV parameter is 15 tasks, and the DSS parameter is 24 tasks.

Attention

The default values recommended for these parameters are based on performance tests that determined the values that would provide the optimal throughput. You should realize that increasing the value of the DSS(nnn) parameter above the recommended default may have a negative impact on throughput.