Example of the Management Class Report

The Management Class Report shows the combinations of L0AGE and L1AGE that would use DASD most cost effectively. For each combination, it also shows the number of recall mounts that would still occur. Recall mounts are mounts that result from data sets that would be called back from migration level 2 tape to primary DASD.

Figure 1 shows part of the Management Class Report. This run produced a total of 528 combinations of the LEVEL0AGE and LEVEL1AGE keywords.

Figure 1. Partial Management Class Report

                             GFTASRT3 -- REPORT(MGMTCLAS)

+--------------------------------------------------------------------------------------+
|  ORDER | L0AGE | L1AGE | L2-MNTS| RECALLS| TOT TRKS | L0-TRKS  | L1-TRKS  |   L2-MB  |
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|      1 |      1|      1|    3384|    3384|    103622|    103622|         0|      1689|  1 
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|      2 |      0|      1|    3384|    3384|        83|         0|        83|         1|  2 
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|      3 |      0|      0|    3384|    3384|         0|         0|         0|      2993|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|      4 |      1|      2|    1200|    3384|    103656|    103622|        34|         1|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|      5 |      0|      2|    1200|    3384|       114|         0|       114|         1|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|      6 |      2|      2|    1200|    1200|    145856|    145856|         0|      1196|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|      7 |      1|      3|     900|    3384|    103678|    103622|        56|         0|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|      8 |      0|      3|     900|    3384|       132|         0|       132|         0|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|      9 |      2|      3|     900|    1200|    145881|    145856|        25|         0|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|     10 |      3|      3|     900|     900|    171418|    171418|         0|       791|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|     11 |      1|      4|     485|    3384|    103687|    103622|        65|         0|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|     12 |      0|      4|     485|    3384|       139|         0|       139|         0|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|     13 |      2|      4|     485|    1200|    145892|    145856|        36|         0|  3   <====
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|     14 |      3|      4|     485|     900|    171431|    171418|        13|         0|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|     15 |      4|      4|     485|     485|    185339|    185339|         0|       560|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|     16 |      1|      5|     351|    3384|    103697|    103622|        75|         0|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|     17 |      0|      5|     351|    3384|       148|         0|       148|         0|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|     18 |      2|      5|     351|    1200|    145902|    145856|        46|         0|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|     19 |      3|      5|     351|     900|    171441|    171418|        23|         0|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+
|     20 |      4|      5|     351|     485|    185349|    185339|        10|         0|
+--------+-------+-------+--------+--------+----------+----------+----------+----------+

Note: Each row of this report represents a unique management class.

1 The first combination of L0AGE and L1AGE for this run is 1 and 1. These values leave the data sets on primary storage for at least 24 hours before the data sets migrate to level 2 tape. Because the value for L1AGE is the same as the value for L0AGE, data sets would bypass migration level 1 storage. This combination would result in 3384 mounts and recalls.

2 The second combination of L0AGE and L1AGE for this run is 0 and 1. These values allow the data sets on primary DASD to migrate to migration level 1 DASD when the next migration occurs, which is less than 24 hours. Then the data sets would remain on migration level 1 for at least 24 hours before migrating to level 2 tape. This combination would result in 3384 mounts and recalls.

3 The thirteenth combination of L0AGE and L1AGE for this run is 2 and 4. This combination significantly reduces migration level 2 mounts from 3384 to 485 and reduces recalls from 3384 to 1200, and the combination of 2 and 4 would be good values to specify for L0AGE and L1AGE for a study at this installation.