4. EXCEPTIONS › 4.3 Detailed Exception Descriptions › 02154: Percent LCU Requests Deferred Exceeds Max

02154: Percent LCU Requests Deferred 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 overcommitted logical control units.

RATIONALE:  A high percentage I/O operations deferred for any
reason 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
I/O operations deferred for any reason 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:

/* ***************************************************
**  02154 PERCENT LCU REQUESTS DEFERRED EXCEEDS MAX **
*************************************************** */
IF LCUPCRQD GT percent
 THEN DO;
  EXCCODE='02154'; SEVERITY='I'; MGMTAREA='PERFORMANCE';
  EXCDESC1='PERCENT LCU REQUESTS DEFERRED EXCEEDS MAX';
  EXCDESC2='REQ. DEFERRED=' !! PUT(LCUPCRQD,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 I/O requests deferred for
any reason is specified.  A threshold of 15 percent would
appear as:

LCUPCRQD GT 15