4. EXCEPTIONS › 4.3 Detailed Exception Descriptions › 02750: IOP Initiative Queue Length Exceeds Max

02750: IOP Initiative Queue Length Exceeds Max

FILE: I/O Processor Queueing File
SAS FILE NAME: DAYS.SCPIOP01
SOURCE LOCATION: prefix.MICS.USER.SOURCE(DYRMFEXC)

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

PURPOSE:  Identify excessive activity by the I/O processor
(IOP).

RATIONALE:  The size of the IOP initiative queue is a measure
of the number of I/O operations that are waiting for service
by the IOP.  An excessively high value could indicate that
there is a problem in the I/O subsystem or that the workload
of the CPC is not well balanced.

DEFINITION:  This exception is detected when the average IOP
queue length exceeds the installation-defined maximum.  The
threshold will vary greatly with the I/O configuration and
workload being executed by the CPC.

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:

/* *************************************************
**  02750 IOP INITIATIVE QUEUE LENGTH EXCEEDS MAX **
************************************************* */
IF IOPAVQUE GT queue-length
 THEN DO;
  EXCCODE='02750'; SEVERITY='I'; MGMTAREA='PERFORMANCE';
  EXCDESC1='IOP INITIATIVE QUEUE LENGTH EXCEEDS MAX';
  EXCDESC2='QUEUE LENGTH=' !! PUT(IOPAVQUE,6.1) !!
                ', IOPID=' !! IOPID ;
  LINK HIT;
END;

THRESHOLD MODIFICATION:  The user should modify the
queue-length value according to the following convention:

queue-length - The maximum length of the IOP initiative queue
is specified.  A queue length of 100 would appear as:

IOPAVQUE GT 100