4. EXCEPTIONS › 4.3 Detailed Exception Descriptions › 02702: Channel Path Busy Exceeds Max

02702: Channel Path Busy Exceeds Max

    FILE: I/O Queuing Configuration File
    SAS FILE NAME: DAYS.SCPIOC01
    SOURCE LOCATION: prefix.MICS.USER.SOURCE(DYRMFEXC)

    SEVERITY: Impacting            (SEVERITY='I')
    MANAGEMENT AREA: Performance   (MGMTAREA='PERFORMANCE')

    PURPOSE:  Identify overloaded channel paths which may be
symptomatic of I/O problems and performance degradation.

    RATIONALE:  As the probability of finding a channel path
busy increases, the probability of I/O operations being
delayed also increases.  This will be particularly impacting
if all of the channel paths within the logical control unit
are excessively busy.

    DEFINITION:  This exception is detected when the channel
path busy percentage exceeds the installation defined
maximum.  The actual percent that indicates a possible
problem varies with the I/O configuration and nature of the
resource(s) being accessed.

    EXCEPTION STATEMENTS:  The SAS statements identifying the
exception situation and describing the condition are stored
in the source member named in SOURCE LOCATION and are
described below:

  /* ***************************************
  **  02702 CHANNEL PATH BUSY EXCEEDS MAX **
  *************************************** */
IF IOCIOTYP =:  'IOP'
 THEN IF IOCPCBSY > percent
  THEN DO;
    EXCCODE='02702'; SEVERITY='I'; MGMTAREA='PERFORMANCE';
    EXCDESC1='CHANNEL PATH BUSY EXCEEDS MAX';
    EXCDESC2='BUSY=' || PUT(IOCPCBSY,5.1) ||
         '%, LCUID=' || TRIM(LCUID) ||
           ', CHAN=' || CHANNEL;
    LINK HIT;
END;

    THRESHOLD MODIFICATION:  The user should modify the
percent value according to the following convention:

    percent - The maximum percent channel path busy is
specified.  A 30 percent threshold would appear as:

    IOCPCBSY > 30