CA SYSVIEW Performance Management

Expand all | Collapse all

DSLB / ZCRNLOG - delay/ time for results to appear

  • 1.  DSLB / ZCRNLOG - delay/ time for results to appear

    Posted 6 days ago
    ​We're currently in the process of installing and verifying the ZCN product feature pack in CA-SYSVIEW V16.

    We've managed to complete the configuration, create logstreams etc and have results coming thru' into ZCNRLOG.

    However; there is a lag of >1 hr between requests being issued and them appearing in ZCNRLOG.

    Is there a polling parameter which we need to change / create ?


  • 2.  RE: DSLB / ZCRNLOG - delay/ time for results to appear

    Broadcom Employee
    Posted 6 days ago
    Hi John,

    Are you collecting SMF type 123 subtype 2 records? If so, these records are only written when one of the following conditions are met (as documented here):
    1. The server processed the required number of requests to fill a record. Currently this is 20.
    2. The server is shutdown.
    Is it possible these conditions are causing your problem? If you are only collecting type 123 subtype 1 records, something else might be at play.

    On the ZCNLIST command, you will find a "FLUSH" line command that will give the z/OS Connect server a hint to cut the records early that you can give a try to see if it lessens the time you are waiting for the records to be cut.


  • 3.  RE: DSLB / ZCRNLOG - delay/ time for results to appear

    Posted 6 days ago
    Thanks Sean. Sorted thank you. ​


  • 4.  RE: DSLB / ZCRNLOG - delay/ time for results to appear

    Broadcom Employee
    Posted 6 days ago
    John,

    One possible reason for the delay.

    When z/OS Connect EE changed the SMF 123 records to version 2, they started blocking their records. z/OS Connect will only write these records when the buffer becomes full. The buffer typically holds about 20 records.  On a system where the activity is very low, it could take considerable time to generate enough records to fill the buffer.

    I raises this concern with IBM. I have suggested that they need to include some form of timer event that would "flush" the buffers at a reasonable interval. They were not very receptive to the idea. They did not see this to be a problem.

    SYSVIEW does include a "FLUSH" line command on the ZCNLIST command to flush the buffers on demand.

    Please let us know if this matches your situtation.

    ------------------------------
    Todd J. Gagle
    Architect of Software Engineering, Team SYSVIEW
    Broadcom
    ------------------------------



  • 5.  RE: DSLB / ZCRNLOG - delay/ time for results to appear

    Posted 6 days ago
    Ok thanks Todd. We're using SMF 123 V2 records but yes indeed the volumes were low. Let me put thru' a bank of requests. ​


  • 6.  RE: DSLB / ZCRNLOG - delay/ time for results to appear

    Posted 6 days ago
    ​Magic - thanks Todd. Yeah either issuing a bank of requests or a FLUSH CURRENT did the trick.