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The execution of inquiries defined in the section above produced the excerpts of reports shown in Figures 2-182 and 2-234. The System Storage Usage Report will be discussed first, with the Common Area Usage Report being used to amplify the reported results where appropriate. Several interesting observations can be made about the activity of the production system based on the two reports. First, the specified extended CSA storage allocation has nearly doubled in the reporting period. At the same time, the extended CSA storage actually allocated has dropped by 17%. The CSA size was increased in February to 12M and again in March to 16M, although the original specification in December would have been sufficient. The second issue relates to the SQA EXPANSION TO CSA, found in the section of the report subtitled KEY AVG. VALUES - BELOW 16M. The SQA is expanding from 67K to 100K, depending upon the month. Referring to the report section KEY MIN/MAX VALUES - < 16M, the SQA actually expanded into CSA as much as 264K. Since this expansion seems to occur frequently, it might be advisable to expand the SQA specification. If the Private Area size below 16M is critical, then the CSA specification could be reduced. Care must be exercised here, as the CSA storage actually allocated is growing slowly. In reviewing the Common Area Storage Report, several observations can be made. Although the extended CSA size was increased considerably, actual storage allocated was reduced. From the report section called CSA AVERAGE BY KEY - > 16M, we can see that Key 1 storage allocation has been reduced by over 98%. The Key 1 storage is used primarily by JES 2, and this system formerly had a large batch workload managed by RJE sites. Migrating this workload to another system and respecifying the JES parameters reduced CSA storage requirements considerably. At the same time, Key 6 storage allocations below 16M were reduced by over 70%, while increasing above 16M. There was no Key 6 storage allocation above 16M until February. This change coincided with the installation of a new VTAM release, which began using CSA storage above 16M. The largest increase in CSA storage usage occurred above 16M, in Key 7 allocation. This key is used by IMS, and this increase represented changes in the IMS configuration, as well as the migration of the production IMS workload to this system. The extended CSA size is sufficient at this time. Indeed, the extended CSA size could be reduced considerably with no ill effects if it were desirable to do so. Although overspecifying the CSA size causes no performance degradation, having excess CSA storage specified could lull one into a false sense of security and result in monitoring not being done often.
MONTHLY SYSTEM STORAGE USAGE REPORT SYSTEM = SYSA RUNDATE = JUL 5, 1988 ---------------------------------------------------------------------------------------------- | | | MONTHS (YY/MM): 87-12 88-01 88-02 88-03 88-04 88-05 CHANGE % | | | |--------------------------------------------------------------------------------------------| | | | AVERAGE MAP - ABOVE 16 MEG | | -------------------------- | | PRIVATE 2009M 2009M 2004M 2001M 2001M 2001M -0.42 % | | CSA 7998K 8548K 12M 16M 16M 16M 106.12 % | | MLPA 44K 44K 44K 44K 44K 44K --- | | FLPA 16K 16K 16K 16K 16K 16K --- | | PLPA 3968K 3968K 4096K 4220K 4220K 4220K 6.35 % | | SQA 8512K 8512K 8512K 8512K 8512K 8512K --- | | NUCLEUS 2464K 2464K 2464K 2464K 2464K 2464K --- | | | |--------------------------------------------------------------------------------------------| | | | AVERAGE MAP - BELOW 16 MEG | | -------------------------- | | NUCLEUS 412K 412K 409K 418K 424K 424K 2.91 % | | SQA 640K 640K 640K 640K 640K 640K --- | | PLPA 2541K 2520K 2406K 2306K 2312K 2312K -9.01 % | | FLPA 4K 4K 4K 4K 4K 4K --- | | MLPA 4K 5K 4K 4K 4K 4K --- | | CSA 6638K 6658K 6775K 6866K 6856K 6856K 3.26 % | | PRIVATE 6140K 6140K 6140K 6140K 6140K 6140K --- | | PREFIX SAVE AREA 4K 4K 4K 4K 4K 4K --- | | | |--------------------------------------------------------------------------------------------| | | | CSA AVG VALUES - ABOVE 16M | | -------------------------- | | FREE PAGES (BYTES) 3776K 3643K 9864K 13M 13M 13M 268.19 % | | LARGEST FREE BLOCK 3684K 3441K 9524K 12M 12M 12M 251.03 % | | ALLOCATED AREA SIZE 4319K 5219K 3057K 3996K 3507K 3554K -17.70 % | | | |--------------------------------------------------------------------------------------------| | | | CSA AVG VALUES - BELOW 16M | | -------------------------- | | FREE PAGES (BYTES) 1222K 1131K 1549K 1816K 1739K 1674K 36.94 % | | LARGEST FREE BLOCK 1065K 966K 1406K 1691K 1572K 1536K 44.24 % | | ALLOCATED AREA SIZE 5646K 5715K 5712K 5171K 5280K 5809K 2.89 % | ----------------------------------------------------------------------------------------------
Figure 2-182. Case Study - System Storage Usage Report (Part 1 of 3)
MONTHLY SYSTEM STORAGE USAGE REPORT SYSTEM = SYSA RUNDATE = JUL 5, 1988 ---------------------------------------------------------------------------------------------- | | | MONTHS (YY/MM): 87-12 88-01 88-02 88-03 88-04 88-05 CHANGE % | | | |--------------------------------------------------------------------------------------------| | | | SQA AVG VALUES - ABOVE 16M | | -------------------------- | | FREE PAGES (BYTES) 6476K 6495K 6578K 6518K 6530K 6590K 1.74 % | | LARGEST FREE BLOCK 6405K 6447K 6516K 6457K 6462K 6545K 2.19 % | | ALLOCATED AREA SIZE 8512K 8512K 8512K 8512K 8512K 8512K --- | | | |--------------------------------------------------------------------------------------------| | | | SQA AVG VALUES - BELOW 16M | | -------------------------- | | FREE PAGES (BYTES) 13K 8K 11K 6K 9K 9K -31.21 % | | LARGEST FREE BLOCK 5K 4K 4K 4K 4K 4K -26.98 % | | ALLOCATED AREA SIZE 638K 638K 638K 638K 638K 638K -0.10 % | | | |--------------------------------------------------------------------------------------------| | | | KEY AVG VALUES - ABOVE 16M | | -------------------------- | | SQA EXPANSION TO CSA 0K 0K 0K 0K 0K 0K N/A | | PLPA PACKING LOSS 9K 9K 10K 11K 11K 10K 15.49 % | | PLPA REDUNDANT SPACE 13K 13K 13K 13K 13K 13K --- | | MAXIMUM USER REGION 2000M 2000M 1996M 1992M 1992M 1992M -0.42 % | | | |--------------------------------------------------------------------------------------------| | | | KEY AVG VALUES - BELOW 16M | | -------------------------- | | SQA EXPANSION TO CSA 67K 83K 76K 100K 95K 88K 31.05 % | | PLPA PACKING LOSS 6K 5K 6K 6K 6K 6K -8.68 % | | PLPA REDUNDANT SPACE 3K 4K 2K 2K 2K 2K -12.82 % | | MAXIMUM USER REGION 5988K 5988K 5988K 5988K 5988K 5988K --- | | | ----------------------------------------------------------------------------------------------
Figure 2-182. Case Study - System Storage Usage Report (Part 2 of 3)
MONTHLY SYSTEM STORAGE USAGE REPORT SYSTEM = SYSA RUNDATE = JUL 5, 1988 ---------------------------------------------------------------------------------------------- | | | MONTHS (YY/MM): 87-12 88-01 88-02 88-03 88-04 88-05 CHANGE % | | | |--------------------------------------------------------------------------------------------| | | | SQA MIN/MAX VALUES - < 16M | | -------------------------- | | FREE PAGES(BYTES) MIN 0K 0K 0K 0K 0K 0K N/A | | FREE PAGES(BYTES) MAX 204K 232K 228K 184K 192K 224K 9.80 % | | LARGEST FREE BLK MIN 0K 0K 0K 0K 0K 0K N/A | | LARGEST FREE BLK MAX 204K 200K 180K 164K 192K 176K -13.72 % | | ALLOC. AREA SIZE MIN 436K 440K 460K 476K 448K 464K 6.42 % | | ALLOC. AREA SIZE MAX 640K 640K 640K 640K 640K 640K --- | | | |--------------------------------------------------------------------------------------------| | | | KEY MIN/MAX VALUES - > 16M | | -------------------------- | | SQA EXP. INTO CSA MIN 0K 0K 0K 0K 0K 0K N/A | | SQA EXP. INTO CSA MAX 0K 0K 0K 0K 0K 0K N/A | | PLPA PACKING LOSS MIN 9K 9K 9K 11K 11K 10K 14.74 % | | PLPA PACKING LOSS MAX 9K 9K 11K 11K 11K 11K 18.26 % | | REDUNDANT PLPA MIN 13K 13K 13K 13K 13K 13K --- | | REDUNDANT PLPA MAX 13K 13K 13K 13K 13K 13K --- | | MAX. USER REGION MIN 2000M 2000M 1992M 1992M 1992M 1992M -0.39 % | | MAX. USER REGION MAX 2005M 2000M 2000M 1992M 1992M 1992M -0.64 % | | | |--------------------------------------------------------------------------------------------| | | | KEY MIN/MAX VALUES - < 16M | | -------------------------- | | SQA EXP. INTO CSA MIN 0K 0K 0K 0K 0K 0K N/A | | SQA EXP. INTO CSA MAX 156K 264K 188K 200K 172K 172K 10.25 % | | PLPA PACKING LOSS MIN 5K 5K 5K 6K 6K 6K 3.50 % | | PLPA PACKING LOSS MAX 8K 5K 8K 7K 6K 6K -29.30 % | | REDUNDANT PLPA MIN 2K 2K 2K 2K 2K 2K --- | | REDUNDANT PLPA MAX 4K 39K 2K 2K 2K 2K -37.31 % | | MAX. USER REGION MIN 5988K 5988K 5988K 5988K 5988K 5988K --- | | MAX. USER REGION MAX 5988K 5988K 5988K 5988K 5988K 5988K --- | | | ----------------------------------------------------------------------------------------------
Figure 2-182. Case Study - System Storage Usage Report (Part 3 of 3)
MONTHLY COMMON AREA STORAGE USAGE REPORT BY KEY SYSTEM = SYSA RUNDATE = JUL 5, 1988 ---------------------------------------------------------------------------------------------- | | | MONTHS (YY/MM): 87-12 88-01 88-02 88-03 88-04 88-05 CHANGE % | | | |--------------------------------------------------------------------------------------------| | | | CSA AVERAGE BY KEY - > 16M | | -------------------------- | | KEY 0 ALLOCATION 527K 570K 541K 593K 603K 583K 10.57 % | | KEY 1 ALLOCATION 2916K 3431K 953K 32K 32K 32K -98.90 % | | KEY 2 ALLOCATION 0K 0K 0K 0K 0K 0K N/A | | KEY 3 ALLOCATION 57K 59K 57K 64K 63K 63K 11.45 % | | KEY 4 ALLOCATION 0K 0K 0K 0K 0K 0K N/A | | KEY 5 ALLOCATION 57K 56K 57K 56K 55K 55K -2.15 % | | KEY 6 ALLOCATION 0K 0K 338K 649K 616K 608K N/A | | KEY 7 ALLOCATION 608K 709K 706K 927K 971K 1183K 94.38 % | | KEYS 8-F ALLOCATION 55K 77K 62K 93K 69K 56K 1.86 % | | | |--------------------------------------------------------------------------------------------| | | | CSA AVERAGE BY KEY - < 16M | | -------------------------- | | KEY 0 ALLOCATION 1619K 1626K 1629K 1644K 1632K 1615K -0.25 % | | KEY 1 ALLOCATION 171K 153K 150K 158K 154K 153K -10.72 % | | KEY 2 ALLOCATION 0K 0K 0K 0K 0K 0K N/A | | KEY 3 ALLOCATION 99K 116K 94K 110K 109K 117K 17.99 % | | KEY 4 ALLOCATION 0K 0K 0K 0K 0K 0K N/A | | KEY 5 ALLOCATION 22K 24K 23K 24K 21K 21K -4.34 % | | KEY 6 ALLOCATION 622K 677K 409K 180K 168K 167K -73.12 % | | KEY 7 ALLOCATION 2683K 2715K 2719K 2702K 2813K 2895K 7.90 % | | KEYS 8-F ALLOCATION 130K 129K 122K 128K 121K 123K -5.30 % | | | ----------------------------------------------------------------------------------------------
Figure 2-183. Case Study - Common Area Storage Usage Report
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