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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.
COLUMN DESCRIPTIONS
SYSID
The System Identifier to which this data applies.
Data Owner
Identifies the owner of the VSAM data sets
represented in this summary group. Depending on
your report options, this value is set based on
the data set name, a combination of CA MICS
account codes, or using a Data Set Group table to
assign ownership.
Total Space in MB
Represents the total space allocated by all the
VSAM data sets belonging to this summary group,
expressed in megabytes.
Total Waste in MB
Represents the total amount of space currently
being wasted by the VSAM data sets belonging to
this summary group. Depending on your report
options, this may represent the sum of up to four
different wasted space calculations.
% of Alloc Waste
The percentage of the VSAM space allocated by the
data sets in this summary group that is being
wasted. This is calculated using the two previous
columns.
Total Data Sets
The total number of VSAM data sets found for this
summary group that were included in this analysis.
Record/CI Waste in MB
Represents the wasted space caused by record sizes
that are not efficient for the control interval
size being used. This total represents all the
data sets in this summary group, and is expressed
in megabytes.
% of Owner Waste
The percentage of the total wasted space reported
for this summary group that is caused by Record/CI
waste. The sum of all four "% of Owner Waste"
columns should be 100%.
Imbed Waste in MB
Represents the wasted space caused by the use of
the IMBED attribute. This total represents all
the data sets in this summary group, and is
expressed in megabytes.
% of Owner Waste
The percentage of the total wasted space reported
for this summary group that is caused by IMBED
waste. The sum of all four "% of Owner Waste"
columns should be 100%.
Block/Trk Waste in MB
Represents the wasted space caused by the size of
the physical blocks being written on each track.
This total represents all the data sets in this
summary group, and is expressed in megabytes.
% of Owner Waste
The percentage of the total wasted space reported
for this summary group that is caused by block/
track waste. The sum of all four "% of Owner
Waste" columns should be 100%.
OverAlloc Waste in MB
Represents the wasted space caused by allocating
more space than is necessary to contain the data.
This total represents all the data sets in this
summary group, and is expressed in megabytes.
% of Owner Waste
The percentage of the total wasted space reported
for this summary group that is caused by
overallocation waste. The sum of all four "% of
Owner Waste" columns should be 100%.
VSAM WASTED SPACE (STGECF) CA MICS StorageMate ABC CORPORATION ----------------------------------------------------------- SYSID=IMS8 ------------------------------------------------------------ Data Owner Total Total % of Total | Record/CI % of | Imbed % of | Block/Trk % of | OverAlloc % of Space Waste Alloc Data | Waste Owner | Waste Owner | Waste Owner | Waste Owner in MB in MB Waste Sets | in MB Waste | in MB Waste | in MB Waste | in MB Waste SALES 10101 3764 37 2951 | 123 3 | 184 5 | 968 26 | 2489 66 MARKETING 5305 2088 39 807 | 32 2 | 19 1 | 431 21 | 1605 77 DATA-CENTER 2548 1026 40 592 | 15 1 | 11 1 | 220 21 | 779 76 PAYROLL 1904 422 22 287 | 49 12 | 3 1 | 235 56 | 135 32 CORPORATE 595 284 48 288 | 3 1 | 3 1 | 45 16 | 232 82 FINANCIAL 21 15 71 17 | 0 0 | 0 0 | 0 3 | 15 97 REMOTE-OPS 23 11 49 24 | 0 2 | 0 0 | 2 18 | 9 81 ---------------- ----------- -------- -------- -------- -------- -------- -------- SYSID 20496 7609 4966 223 220 1902 5263 =========== ======== ======== ======== ======== ======== ======== 20496 7609 4966 223 220 1902 5263
Figure 4-84. VSAM Wasted Space / Summary
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