Data Set Size Report
The Data Set Size Report displays the size distribution of selected data sets.
See the following sections in this topic for more information:
- What you can do with the report
- Organization of the report
- Usage notes for creating the report
- Available fields on the report
- Sample report
What you can do with the report
Migrating larger data sets to less costly storage is generally cost-effective and can improve DASD space utilization.
You can use the Data Set Size Report to:
- Adjust migration periods for data sets and pools
- Indicate appropriate management class definitions
- Indicate short-term space requirements
- Examine size distribution by data set name, by volume, and by storage group
Organization of the report
The Data Set Size Report is organized by pool, size, and migration level.
Selected data sets are grouped by pool first; within each pool, data sets are grouped by size, based on user-defined parameters. Within each size bracket, data sets are grouped by migration level.
The report displays the number of data sets (by count) and the total size of data sets (by percentage). Cumulative totals are also reported.
Usage notes for creating the report
Consider the following information when creating the Data Set Size Report:
- A selection by data set name or volume will report all pools and storage groups containing those resources. Selection by pool will report only on specified pools.
To define the size brackets, issue the STEP action parameter, as follows:
DEFINE STEP = (startSize,stepSize,numberSteps)The startSize defines the lower limit of the report. Data sets below this size are excluded from the report. This number is in megabytes.
The stepSize defines the span of each report step in megabytes.
The numberSteps defines the number of detail steps in the report. One step is added to this figure, to summarize all data sets above the topmost step; for example:
DEFINE STEP = (2, 10, 5) organizes the Data Set Size Report into 5 steps of 10 MB each, with a final step for all data sets larger than 52 MB, and with the lowest step starting at 2 MB. The report steps are:
- 2-11 MB
- 12-21 MB
- 22-31 MB
- 32-41 MB
- 42-51 MB
- >52 MB
- The DFSMSHSM migration control data set (MCDS) is required if migrated data sets are to be included in the report. If the ddname MCDS is not in the JCL, migrated data sets (ML1 or ML2) are not included. Omitting the MCDS data set has the same effect as specifying EXCLUDE MIGRATED DS = YES.
Available fields on the report
The following fields are available for the Data Set Size Report:
Column heading | Description |
|---|---|
POOL or STORAGE GROUP | Indicates the name of the pool or storage group by which the report is organized |
START - END | Indicates the data sets that are grouped by user-defined aging parameters |
NUMBER OF DS NUMBER % TOTAL CUMULATIVE | Indicates the number of data sets in each size/migration bracket expressed in the following columns: |
Indicates the number of data sets in the corresponding size/migration bracket | |
Indicates the proportion of the data sets in a single size range to the total number of data sets for the migration level | |
Indicates the total of all data in the column to the left and above | |
SIZE OF DS SIZE %TOTAL CUMULATIVE | Indicates the size of the total data sets in each size/migration bracket expressed in the following columns: |
Indicates the size of data sets in the corresponding size/migration bracket | |
Indicates the proportion of the data sets in a single size range to the total data sets for the migration level | |
Indicates the total of all data in the column to the left and above | |
TOTAL (ML+ML1+ML2) | Shows the total of all three migration levels in each size bracket |
Sample report
The following figure is a sample of the Data Set Size Report:
DATA SET SIZE REPORT BMC SOFTWARE DATE: 23/01/1998 TIME: 15:02 PAGE: 4
==================================================================================================================================
POOL : BMCWRK
NUMBER OF DS SIZE OF DS TOTAL
START - END NUMBER % TOTAL CUMULATIVE SIZE % TOTAL CUMULATIVE (ML0+ML1+ML2)
----------------------------------------------------------------------------------------------------------------------------------
| 0 MB- 4 MB ML0 | 532 89 % | 532 89 % | 240 MB 15 % | 240 MB 15 % | |
| ML1 | 330 90 % | 330 90 % | 314 MB 28 % | 314 MB 28 % | 1023 89 % |
| ML2 | 161 85 % | 161 85 % | 159 MB 21 % | 159 MB 21 % | 715 MB 21 % |
----------------------------------------------------------------------------------------------------------------------------------
| 5 MB- 9 MB ML0 | 27 4 % | 559 93 % | 189 MB 12 % | 430 MB 28 % | |
| ML1 | 13 3 % | 343 94 % | 89 MB 8 % | 404 MB 36 % | 48 4 % |
| ML2 | 8 4 % | 169 89 % | 58 MB 7 % | 218 MB 29 % | 337 MB 9 % |
----------------------------------------------------------------------------------------------------------------------------------
| 10 MB- 14 MB ML0 | 8 1 % | 567 95 % | 94 MB 6 % | 525 MB 34 % | |
| ML1 | 12 3 % | 355 97 % | 147 MB 13 % | 552 MB 49 % | 27 2 % |
| ML2 | 7 3 % | 176 93 % | 80 MB 11 % | 298 MB 40 % | 323 MB 9 % |
----------------------------------------------------------------------------------------------------------------------------------
| > 15 MB ML0 | 28 4 % | 595 100 % | 1006 MB 65 % | 1531 MB 100 % | |
| ML1 | 9 2 % | 364 100 % | 568 MB 50 % | 1120 MB 100 % | 50 4 % |
| ML2 | 13 6 % | 189 100 % | 431 MB 59 % | 730 MB 100 % | 2005 MB 59 % |
----------------------------------------------------------------------------------------------------------------------------------
| TOTAL FOR ML0 | 595 | | 1531 MB | | |
| BMCWRK ML1 | 364 | | 1120 MB | | 1148 |
| ML2 | 189 | | 730 MB | | 3382 MB |
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