2. PERFORMANCE REPORTING ANALYSIS › 2.5 Virtual Storage Management Analysis › 2.5.3 Standard Output › 2.5.3.5 System Storage Usage Plot

2.5.3.5 System Storage Usage Plot

The System Storage Usage Plot tracks the allocation of
virtual storage at a monthly, weekly, daily, hourly, or
detail level.  Figure 2-171 shows an example of a daily
System Storage Usage Plot.  The plots obtain their data
exclusively from the SCPVSM File.

PLOT OPTIONS

The System Storage Usage Plot supports standard time
selection options, as well as SYSID selection and external
data selection.  These options are controlled by the control
options discussed in Section 2.5.6.

Additionally, the plot may be produced in two formats:

    o  TOTAL
    o  BELOW 16 MEG. ONLY

In the TOTAL format, the plot displays all of the measurement
variables, both above and below the 16MB.  line.  The TOTAL
option is the default.  In the BELOW 16 MEG.  ONLY format,
only the measurement variables from below 16MB.  are
displayed.  This format will produce a more detailed display
of this lower portion of virtual storage than that of the
TOTAL option.

DATA ELEMENTS

PREFIX:      The size of the Prefix Save Area, which is fixed
             at 4K.  This is an area used by the hardware and
             addressed explicitly by the operating system.

PRIVATE:     The storage that is assigned to the private
             areas for all MVS address spaces.  These values
             are from the VSMAPVTL and VSMAPVTH elements.

CSA:         The storage assigned to the Common Storage Area.
             This value is contained in the VSMACSAL and
             VSMACSAH elements.

LPA:         The storage assigned to the Pageable Link Pack
             Area, from the VSMALPAL and VSMALPAH elements.
             Also plotted separately are the FLPA (Fixed LPA)
             storage, from the VSMAFLPL and VSMAFLPH
             elements, and the MLPA (Modified LPA) storage,
             from the VSMAMLPL and VSMMLPH elements.

SQA:         The storage assigned to the System Queue Area
             from the VSMASQAL and VSMASQAH elements.
             Because SQA is totally fixed storage, the size
             of the SQA also indicates the number of real
             storage frames used.

NUCLEUS:     The size of the nucleus area, including the
             nucleus load module and nucleus control blocks.
             This value comes from the VSMANUCL and VSMANUCH
             elements.

                                                 DAILY SYSTEM STORAGE USAGE PLOT
                       SYMBOLS:  A: PSA       P: PRIVATE    C: CSA/ECSA  L: LPA/ELPA  S: SQA/ESQA  N: NUCLEUS
                                                 SYSTEM IDENTIFIER=MVS1 TIME ZONE=1
          |
  2097152 +P     P     P     P     P     P     P     P     P     P     P     P     P     P     P     P     P     P     P     P     P
          |
V         |
I   40960 +C     C     C     C     C     C     C     C     C     C     C     C     C     C     C     C     C     C     C     C     C
R         |
T         |
U   32768 +
A         |
L         |L     L     L     L     L     L     L     L     L     L     L     L     L     L     L     L     L     L     L     L     L
    30720 +
A         |
D         |
D   28784 +
R         |
E         |S     S     S     S     S     S     S     S     S     S     S     S     S     S     S     S     S     S     S     S     S
S   26624 +
S         |
          |
S   18432 +N     N     N     N     N     N     N     N     N     N     N     N     N     N     N     N     N     N     N     N     N
P         |
A         |
C   16384 +N=====N=====N=====N=====N=====N=====N=====N=====N=====N=====N=====N=====N=====N=====N=====N=====N=====N=====N=====N=====N
E         |S     S     S     S     S     S     S     S     S     S     S     S     S     S     S     S     S     S     S     S     S
          |
M   15360 +L     L     L     L     L     L     L     L     L     L     L     L     L     L     L     L     L     L     L     L     L
A         |
P         |
    14336 +
-         |
          |
I   13312 +
N         |C     C     C     C     C     C     C     C     C     C     C     C     C     C     C     C     C     C     C     C     C
          |
1   12288 +
K         |
          |
U   10240 +
N         |
I         |
T    8192 +P     P     P     P     P     P     P     P     P     P     P     P     P     P     P     P     P     P     P     P     P
S         |
          |
        0 +A     A     A     A     A     A     A     A     A     A     A     A     A     A     A     A     A     A     A     A     A
          -+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
         05/30 05/31 06/01 06/02 06/03 06/06 06/07 06/08 06/09 06/10 06/13 06/14 06/15 06/16 06/17 06/20 06/21 06/22 06/23 06/24

 Figure 2-171. Sample Daily System Storage Usage Plot