Implementation

If Control-M/Tape was brought up without activating the Dynamic Data Set Stacking facility, you have to stop Control-M/Tape and restart it in order activate this facility.

Note: If Control-M/Tape was brought up with stacking activated, stacking can be stopped and started through commands STOPSTK and STARTSTK.

Determine which data sets, jobs, and tape pools should be stacked.

• Verify that the appropriate rules have been defined, coded, and activated (ordered) for these data sets, jobs, or tape pools.
• The DO STACK=Y statement must be included in rules that refer to the data sets that are to be stacked. Rules modified to support stacking must be reloaded into the Control-M/Tape Real-time environment using the following command:

  S CTTINIT,PARM=‘RELOAD,TBLT=RULE’

• Use the CTTCRSS ISPF online utility to ensure that the stacking rules you are invoked for the appropriate jobs and data sets. (TSO%CTTCRSS, or from the IOA Online Utility menu, specify Option 6, followed by Option T1.)
• Make sure that all stacking rules are in production mode (that is, MODE is set to PROD in the rule definition).
• Use DO STKRULE statements in the rules to prevent possible data set conflicts (see the CTTSCA utility in the Control-M/Tape Utilities chapter of the INCONTROL for z/OS Utilities Guide).
• Use DO STKGROUP statements in the rules to define logical groups of data sets. Each data set is stacked only with other data sets that have been assigned the same group name.

For more information about specific DO statements in Control-M/Tape rules, see the rule parameters chapter of the Control-M/Tape User Guide.

For more information about conditions necessary for stacking implementation, see the description of stacking in the organization and administration chapter of the Control-M/Tape User Guide.