Data Class Recommendation Report
What you can do with the report
Because DFSMS provides the data class, users do not need to know the physical requirements of data sets.
The following scenarios can help you determine data class recommendations using the Data Class Recommendation Report:
- Create a data class with these characteristics if 23% of your data sets have the characteristics LRECL=80, BLKSIZE=8000, RECFM=FB, DSORG=PO.
- Create a data class with these characteristics if 11% of your DASD space is occupied by data sets with the characteristics LRECL=133, BLKSIZE=13300, RECFM=FBA, DSORG=PS, regardless of how many data sets compose that group.
Organization of the report
The Data Class Recommendation Report is organized by DCB attributes: record length, block size, record format, data set organization, space requirements, DSNTYPE, and so on.
Selected data sets are accumulated into attribute categories, and reported in decreasing sort order on count (number of data sets in the category) and size (total size of all data sets in the category).
The size of each category (count and space) is reported by the following methods:
- Horizontal bar chart
- Percentage
- Actual count and size
Usage notes for creating the report
Consider the following information when creating the Data Class Recommendation Report:
To limit the reporting of data set attribute categories, specify the following parameters:
EXCLUDE NUMBER OF DSnnIn this specification, nn specifies the minimum number of data sets in a category. Any group’s DCB attributes with fewer than nn data sets are not reported. This feature allows the report to be restricted to categories of a specific size.
The EXCLUDE MIGRATED selection parameter is ignored for this report. Migrated data sets are not included in the report under any circumstances.
- The horizontal bar chart is a graphical representation that provides a quick indication of the practicality of a potential data class. A longer bar indicates that more data sets are covered by the data class. For each category, the total count and the total size are represented graphically. Each character represents 2% of the total. Plus characters (+) represent data set count; asterisk characters (*) represent data set size.
Available fields on the report
The following fields are available for the SMS Data Class Recommendation Report:
Field name | Description |
|---|---|
TOTAL NUMBER | Indicates for each category, the total count and size, displayed as a percentage of the total data sets that were selected for the report |
MB USED | Indicates for each category, the actual total count and size in Megabytes |
LRECL | Indicates the record length of data sets in the category |
BLKL | Indicates the block size of data sets in the category |
RECFM | Indicates the record format of data sets in the category |
DSORG | Indicates the data set organization of data sets in the category |
Sample report
The following figure is a sample of the SMS Data Class Recommendation Report:
SMS DATA CLASS RECOMMENDATION BMC SOFTWARE DATE: 17/01/1998TIME: 14:34 PAGE: 3
TOTAL NUMBER/MB USED LRECL /BLKL /RECFM/DSORG
==================================================================================================================================
+++++++++++++++++++++++++++++ 59 % 2316 2048/22528/FB /PS
*************** 30 % 3001 MB
----------------------------------------------------------------------------------------------------------------------------------
+++ 6 % 236 80/ 6160/FB /PO
***** 11 % 1126 MB
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++ 5 % 230 80/ 3120/FB /PO
* 2 % 294 MB
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++ 4 % 158 121/23474/FBA /PS
0 % 9 MB
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+ 3 % 143 / 6144/U /PO
** 5 % 536 MB
----------------------------------------------------------------------------------------------------------------------------------
+ 3 % 139 / 4096/U /VS
****** 12 % 1213 MB
----------------------------------------------------------------------------------------------------------------------------------
+ 2 % 96 80/23440/FB /PO
* 3 % 349 MB
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1 % 49 / /- /--
0 % 55 MB
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