GFTASRT3—Tape Data Set Statistics Report

GFTASRT3 is the part of the GFTAVMA summary report that shows the current version of a data set, its current size, the job and program that created it, and all mounts attributed to all versions of that data set. It shows only the current volume the data set resides on.

If you specify the GDG(GROUP) keyword, the numbers in the Tape Data Set Statistics Report reflect non-GDG data sets and GDG data sets that are grouped together and counted as one generation data group.

Figure 1 is the report of tape data set statistics. In this report, keywords were not specified.

Figure 1. GFTASRT3 Summary Report—Tape Data Set Processing Phase


GFTASRT3 -- TAPE DATA SET PROCESSING PHASE -- 05/21/2004 -- 03:45:10 P.M.

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*                                                                             *
*                      GFTASRT3 TAPE DATA SET STATISTICS                      *
*                                                                             *
*******************************************************************************

   38702     GDS(S) - ( 93.9%) --     2049 GDG GROUP(S)      200 MAX GDS/GDG   1 
    2536 NON-GDS(S) - (  6.1%)
--------
   41238(+)  TOTAL  - (100.0%)       40612 IDRC DS ( 98.5%)

(+)       2 OF THESE DATA SET(S) HAD A CALCULATED SIZE WHICH EXCEEDED THE MAXIMUM VOLUME CAPACITY
            -- THE SIZE WAS OVERRIDDEN DUE TO THE 'FORCECAP' KEYWORD

      31.7 MB   (AVG PER DATA SET)  2 38584.8 MOUNTS  (STATISTICAL)   5 
    1309.1 GB   (CUM TOTAL ALL DS)  3  6338.1 VOLUMES (STATISTICAL)   6 
      31   DAYS (MAX REF AGE)    4        0.3 DAYS    (AVG MAX REF AGE)    7     8 

+-----------------------------------------------------------------------------+
|                          SINGLE-VOLUME DATA SET(S)                          |
+-----------------------------------------------------------------------------+
| DATA SET| # OF |  % OF |        |       |# OF STAT| % STAT|# OF STAT| % STAT|
|FILE TYPE| DSNS |  DSNS | # OF GB|% OF GB|  MOUNTS | MOUNTS|  VOLUMES|VOLUMES|
+---------+------+-------+--------+-------+---------+-------+---------+-------+
|SING-FILE|  9474|  23.0%|   276.1|  21.1%|  21629.2|  56.1%|   3626.0|  57.2%|   9 
+---------+------+-------+--------+-------+---------+-------+---------+-------+
|MULT-FILE| 29096|  70.6%|   328.6|  25.1%|  10922.3|  28.3%|   1786.0|  28.2%|
+-----------------------------------------------------------------------------+
|                           MULTIVOLUME DATA SET(S)                           |
+-----------------------------------------------------------------------------+
| DATA SET| # OF |  % OF |        |       |# OF STAT| % STAT|# OF STAT| % STAT|
|FILE TYPE| DSNS |  DSNS | # OF GB|% OF GB|  MOUNTS | MOUNTS|  VOLUMES|VOLUMES|
+---------+------+-------+--------+-------+---------+-------+---------+-------+
|SING-FILE|   469|   1.1%|   352.1|  26.9%|   4603.1|  11.9%|    619.0|   9.8%|
+---------+------+-------+--------+-------+---------+-------+---------+-------+
|MULT-FILE|  2199|   5.3%|   352.3|  26.9%|   1430.1|   3.7%|    307.1|   4.8%|
+---------+------+-------+--------+-------+---------+-------+---------+-------+
|TOTAL DSN| 41238| 100.0%|  1309.1| 100.0%|  38584.8| 100.0%|   6338.1| 100.0%|
+-----------------------------------------------------------------------------+


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*                                                                             *
*   THE FOLLOWING "DATA SET SIZE RANGE TABLE" REPRESENTS THE CURRENT PATTERN  *
*   OF DATA SET SIZES FOR THE PARTICULAR SET OF DATA IN THE SMF SAMPLE        *
*   SELECTED.  IT DOES NOT IMPLY THAT ALL OF THESE DATA SETS STILL EXIST.     *
*   SOME OF THEM MAY HAVE ALREADY EXPIRED.  THE TABLE DOES SHOW THE SIZE OF   *
*   EACH DATA SET THE LAST TIME THAT DATA SET HAD BEEN WRITTEN (IF KNOWN).    *
*   THE PURPOSE OF THIS TABLE IS TO SHOW THE CURRENT SIZE RANGES OF DATA SETS *
*   THAT ARE BEING CREATED IN YOUR INSTALLATION ON THE PARTICULAR SET OF DATA *
*   YOU HAVE FILTERED ON.  THESE SIZE RANGES SHOULD CLOSELY MATCH THE SIZE    *
*   RANGES OF THE DATA SETS THAT ACTUALLY DO EXIST ON YOUR SYSTEM.  THE MOST  *
*   RECENT SIZE OF THE DATA SET IS ALWAYS USED.                               *
*                                                                             *
*******************************************************************************

1 The GDG statistics show the number of GDSs per GDG during the sample period.

2 The size of data sets on tape averaged 31.7MB for this run.

3 The total amount of data represented by the 41,238 data sets in this run is 1309.1GB.

4 The age of the oldest data set in the sample, where age is the number of days between the date of last reference and the end of the sample, is 31 days. If this value is less than the number of days in the sample, all data sets from the early part of the sample have been deleted or referenced during the sample period.

5 For an explanation of statistical mounts, see Statistical Mounts.

6 For an explanation of statistical volumes, see Statistical Volumes.

7 The average of all the maximum numbers of days since last reference for all data sets in the sample. If this number is significantly less than 1, such as 0.1, it indicates that the majority of the data sets in this sample are referenced as backup and can be migrated off the tape mount management DASD buffer hourly.

8 This line does not print if you specify GDG(GROUP).

9 Note the high percentage of single file data sets (23.0%) and the percentage of mounts they represent (56.1%). These data sets are probably data sets that were created for backup purposes during batch processing. They are all necessary, but they contribute to inefficient use of tape. If you manage only these data sets with tape mount management, you can reduce the majority (56.1%) of your tape mounts.