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Source: VCA_VS file at the DETAIL timespan
Function: This facility helps to identify departments or
groups that are wasting DASD storage space due to
poor VSAM allocation practices. These problems
can be caused either by allocating more space than
is necessary, or by using other VSAM options
incorrectly. The Storage Administrator can
perform up to four different types of space
analysis with this facility, and can report the
results on one combined report or on separate
reports. Correction of the problems detected by
this facility may recover a large amount of
storage space with a small amount of effort.
The term "wasted space" in these reports refers to
any space that is allocated (so that it cannot be
used by others), and yet is not currently being
used to contain data. In some cases, such as the
overallocation of a data set to accommodate future
growth, this is normal. These reports also focus
strictly on wasted space, and do not consider
other factors such as performance. Before making
any changes to the VSAM data sets appearing on the
reports from this facility, it is strongly
suggested that other performance and application
factors be considered.
Features: Summary reports should be run regularly to monitor
wasted space, with more detailed reporting
occurring when problems are detected. A wide
variety of filtering and reporting options allow
many views of the same data to be obtained.
Summary reports can be produced as tabular
reports, printer graphics reports or color
graphics reports, and can be summarized based on
the data set name, the CA MICS accounting codes,
or using a Data Set Group table. Detail reports
may then be generated to isolate problems to the
data set level. If the detail report still does
not provide enough information, up to four
different analysis reports can be run.
SMS
Issues: Users planning for SMS could identify those groups
with the worst space usage values, as they may be
the best candidates for the immediate benefits of
SMS. As groups migrate to SMS control, regular
use of this report would verify that the expected
space savings from SMS are being realized.
ELEMENT DESCRIPTIONS
SYSID
The System Identifier to which this data applies.
Type
Up to four different types of space checking may
be requested in one report run. The Type label
appears at the top of the chart and identifies the
type of wasted space represented by this chart.
The following values may appear:
*TOTAL*
Shows the combined wasted space for all of the
types of space analysis requested in this run.
Block/Track Size
Shows wasted space caused by the size of the
physical blocks being written on each track.
Imbed Overhead
Shows wasted space caused by the use of the
IMBED attribute.
Overallocation
Shows wasted space caused by allocating more
space than is necessary to contain the data.
Record/CI Size
Shows wasted space caused by record sizes that
are not efficient for the control interval
size being used.
Pie Slices
The pie slices represent the total amount of space
being wasted by the data sets in each
summarization group, in millions of bytes
(megabytes).
Pie Labels
The labels on each slice identify the
summarization key for this chart. Depending on
the values specified on the report option screen,
this will represent one or more VCA account
elements, one or more nodes of the data set name,
or will contain a value derived from your Data Set
Group table.
VSAM WASTED SPACE (STGECF) CA MICS StorageMate ABC CORPORATION SYSID=IMS8 Type=*TOTAL* MARKETING ********************* ***** ***** *** *.* ** . *** ** . *** ** . ** ** .. *** ** . ** DATA-CENTER * 2088 . ** * 27.44% . ** ** . * * . ** * . ** * . 1026 * . . 13.48% * * . . . . * * . . . .. .* * . . . . . . . . * PAYROLL * . . . . . . . * * 422 . . . . . . . . . * CORPORATE * 5.54% . . . . . 284 * * . . . . . . . . . . . . . + . . . . . . . . . ...3% * . . . . . . . . . . * * * * * * * * * * * * * * * * * ** * ** * ** * ** * ** ** 3764 ** ** 49.46% *** ** ** ** *** ** *** *** *** ***** ***** ********** ********** SALES
Figure 4-83. VSAM Wasted Space / Chart
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