5. FILES › 5.3 SCP Information Area Files › 5.3.8 I/O Queuing Configuration File (SCPIOC) › 5.3.8.3 Usage Considerations

5.3.8.3 Usage Considerations

Special considerations or techniques related to using the
SCPIOC file are provided below.

1.  The following elements of the SCPIOC file only have
    meaning when used in the DETAIL timespan, since
    significance is lost once summarization has been
    performed.  In the higher timespans, the data elements
    are retained based on the last reference from the file to
    be summarized.

    CYCLETM  - Sampling Time Cycle Length
    IOCCU1   - First Control Unit Attached
    IOCCU2   - Second Control Unit Attached
    IOCCU3   - Third Control Unit Attached
    IOCCU4   - Fourth Control Unit Attached
    IOCVAR   - Channel Path Varied
    IOCCNF   - Channel Path Installed
    IOCOFF   - Channel Path Offline to LCU Devices

2.  Care must be exercised in using the special date and time
    data elements contained in each CA MICS file. As the
    file's granularity increases in higher timespans, certain
    fields lose significance; they should not be used in
    those cases.

    o  HOUR should not be used in MONTHS.
    o  DAY and DAYNAME should not be used in WEEKS, MONTHS.
    o  WEEK should not be used in MONTHS.

3.  ENDTS and STARTTS, when appearing in the DAYS, WEEKS, or
    MONTHS timespans, bound the span of time over which the
    data has been summarized.  STARTTS is the lowest date and
    time, and ENDTS is the highest date and time for the data
    summarized.  These data elements have different meanings
    when used in the DETAIL timespan versus the DAYS, WEEKS,
    and MONTHS timespans.  Their purpose in DETAIL is
    described below:

    o  STARTTS represents RMF recording interval start time.
    o  ENDTS represents RMF recording interval end time.

4.  The data element LCUID is used to identify the logical
    control unit number.

5.  Channel path utilization statistics recorded in the
    SCPIOC file are generated by the hardware monitor that
    uses a different sampling rate than the RMF monitor.
    Consequently, if converting IOC accumulated variables to
    a percentage or rate, do not use the SAMPLES or CYCLETM
    value found in the SCPIOC file.  Use the SAMPLES variable
    as recorded in the HARPCA file.  This situation is
    unavoidable due to the fact that the RMF type 78 subtype
    3 record, which is the source for the SCPIOC file,
    records only the number of RMF samples taken during the
    interval.