4. EXCEPTIONS › 4.3 Detailed Exception Descriptions › 02152: Percent All Channel Paths Busy Exceeds Max

02152: Percent All Channel Paths Busy Exceeds Max

    FILE: Logical Control Unit Activity File
    SAS FILE NAME: DAYS.SCPLCU01
    SOURCE LOCATION: prefix.MICS.USER.SOURCE(DYRMFEXC)

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

    PURPOSE:  Identify overcommitment of channel paths.

    RATIONALE:  If all possible channel paths attached to a
logical control unit are busy, the LCU is unable to start any
new I/O operations.  A high percentage of observations with
this condition indicates a possible I/O bottleneck,
resulting in lower throughput or elongated response
times in I/O-sensitive online systems.

    DEFINITION:  This exception is detected when the percent
of observations when all channel paths attached to the LCU
are busy exceeds the installation defined maximum.

    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:

 /* ****************************************************
 **  02152 PERCENT ALL CHANNEL PATHS BUSY EXCEEDS MAX **
 **************************************************** */
IF LCUPCABY > percent
 THEN DO;
  EXCCODE='02152'; SEVERITY='I'; MGMTAREA='PERFORMANCE';
  EXCDESC1='PERCENT ALL CHANNEL PATHS BUSY EXCEEDS MAX';
  EXCDESC2='BUSY=' || PUT(LCUPCABY,5.1) ||
       '%, LCUID=' || LCUID;
  LINK HIT;
END;

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

    percent - The maximum percent of observations when all
channels paths attached to the LCU are busy is specified.  A
threshold of 15 percent would appear as:

    LCUPCABY > 15