4. FILES › 5.2 VTS Component Files › 5.2.2 VTS Component IVT Information Area Files › 5.2.2.2 VTS Composite Library Activity File (IVTVCL) › 5.2.2.2.3 IVTVCL Usage Considerations

5.2.2.2.3 IVTVCL Usage Considerations

This section identifies any special considerations or
techniques related to using the IVTVCL file.

The IVTVCL observations contain statistics relating to the
logical view of a peer-to-peer VTS.  For IVTVCL observations,
both the Composite Library Association (IVTCMPID) and Library
Sequence Number (IVTVLS) will contain the same value.  The
User Interface (UI) and secondary VTSs that participate in
the peer-to-peer configuration are identified with data
elements UI IVTVLS ID (VCLUIID) and SECONDARY IVTVLS ID
(VCLSECID).

Statistics for the UI and Secondary VTS activity are found in
the VTS Distributed Library Activity (IVTVDL) file.

IVTVCL file observations primarily contain statistics related
to overall virtual volume activity and are useful for
determining z/OS throughput of a peer-to-peer VTS
configuration.  In addition, IVTVCL file observations are
useful for monitoring the virtual volume copy function and
overall virtual volume controller activity of each
peer-to-peer VTS.