z/OS DFSMShsm Implementation and Customization Guide
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DFSMShsm command processor performance considerations

z/OS DFSMShsm Implementation and Customization Guide
SC23-6869-01

The DFSMShsm command processor task attaches separate tasks to process the following long-running commands:
  • AUDIT
  • BACKVOL CDS
  • LIST
  • RECYCLE
  • REPORT
  • TAPECOPY
  • TAPEREPL
  • EXPIREBV

Other commands are processed by using calls to the appropriate DFSMShsm modules. If additional commands are received by the general command processor before control has been returned to it by one of the above command processors, processing of the new command does not begin until control has been returned. The delay in the processing is normally not noticeable. However, if the command currently in process is waiting for a resource held by a long-running task, some processing delay can be experienced. The user should consider this aspect when using long running commands.

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