4. EXCEPTIONS › 4.3 Detailed Exception Descriptions › 01700: Logical Processor Underutilized

01700: Logical Processor Underutilized

FILE: PR/SM Logical Proc Activity File
SAS FILE NAME: DAYS.HARVPA01
SOURCE LOCATION: prefix.MICS.USER.SOURCE(DYRMFEXC)

SEVERITY: Warning              (SEVERITY='W')
MANAGEMENT AREA: Performance   (MGMTAREA='PERFORMANCE')

PURPOSE:  Detects an underutilized logical processor.

RATIONALE:  An underutilized logical processor may result
from lack of workload or may serve as an indication of
improper LPAR definition criteria, such as poorly defined
processor weights.  If such a processor is used in a
partition used for production workloads, service objectives
may not be met.  Detection of low logical processor
utilization may identify periods of poor performance,
permitting further investigation of the critical resources.

For additional information concerning interpretation and
usage of these values, refer to Section 6.8 of this guide.

DEFINITION:  This exception is detected when the logical
processor utilization percentage is below the site-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.
*******************************************************;
*** 01700 *** PR/SM LOGICAL PROCESSOR UNDERUTILIZED ***;
*******************************************************;
IF (SYSID EQ 'rsys')
 THEN IF ((HEXLPID EQ 'id1' AND VPAPCVPU LT pct1) OR
          (HEXLPID EQ 'id2' AND VPAPCVPU LT pct2))
  THEN IF ((HOUR LE hh1 AND HOUR GE hh2) AND
           (DAYNAME NE 'SAT' AND DAYNAME NE 'SUN'))
   THEN DO;
     EXCCODE='01700'; SEVERITY='W'; MGMTAREA='PERFORMANCE';
     EXCDESC1='PR/SM LOGICAL PROCESSOR UNDERUTILIZED.  ID='
            !! HEXLPID;
     EXCDESC2='LPAR ID='  !! HEXLPID !!
             ' LOG PROC=' !! PUT(VPAADDR,HEX2.) !!
             ' WAS' !! PUT(VPAPCVPU,5.1) !! '% BUSY';
     LINK HIT;
   END;

THRESHOLD MODIFICATION:  Modify the recording SYSID, the LPAR
IDs, the percent values and prime time according to the
following conventions:

rsys - The SYSID of the system whose measurements are to be
used to evaluate the exception condition.  If the evaluation
is to be made based on the information recorded by RMF
running in a system ID of SYS1, the statement would appear
as:

IF (SYSID EQ 'SYS1')

id - Specifies the logical partition ID, a two-character
hexadecimal number, with lead zero if applicable, in quotes.

percent - Specifies the minimum logical processor utilization
for a particular LPAR.

A 10 percent threshold for LPAR ID 1 and a 50 percent
threshold for LPAR ID C appear as:

IF ((HEXLPID EQ '01' AND VPAPCVPU LT 30) OR
    (HEXLPID EQ '0C' AND VPAPCVPU LT 50))
prime time - Specifies the hour range and days of the week to
be included in the exception.  The hour of the day must be
within the hh1 through hh2 range.  The days of the week are
represented by the first three characters of their names.
Prime time specified as 8:00 am through 6:59 pm (18:59) on
weekdays only appears as:

IF ((HOUR GE 8 AND HOUR LE 18) AND
    (DAYNAME NE 'SAT' AND DAYNAME NE 'SUN'))

The time period to be included may already be defined by
means of the ZONE definition, which provides a simpler method
of selecting hours and days for processing.  If ZONE 1
corresponds to the desired time period, it appears as:

IF ZONE EQ '1'