Common Storage Summary section
The common storage summary section enables you to measure the use of virtual storage with minimal overhead. It contains the information you need to understand your current use of virtual storage. If you archive the data, you can use differences over time to predict a problem or constraint before it becomes critical. It also helps you to verify the size values set for CSA and SQA at IPL time and determine if you are using common storage effectively. Because RMF does not sample virtual storage data at every cycle, the value reported for NUMBER OF SAMPLES is less than the number of cycles.
V I R T U A L S T O R A G E A C T I V I T Y
PAGE 1
z/OS V2R4 SYSTEM ID TRX1 DATE 05/11/2019 INTERVAL 03.31.164
RPT VERSION V2R4 RMF TIME 16.56.01 CYCLE 1.000 SECONDS
COMMON STORAGE SUMMARY
NUMBER OF SAMPLES 24
STATIC STORAGE MAP ALLOCATED CSA/SQA
AREA ADDRESS SIZE ------------ BELOW 16M -------------- ------- EXTENDED (ABOVE 16M) --------
EPVT 22B00000 1493M MIN MAX AVG MIN MAX AVG
ECSA E7C3000 323M SQA 396K 16.56.02 1196K 16.56.41 1062K 33.5M 16.56.02 97.5M 16.56.52 86.8M
EMLPA 0 0K CSA 392K 16.56.02 892K 16.56.41 808K 45.6M 16.56.02 49.7M 16.57.21 49.0M
EFLPA E7C0000 12K
EPLPA A96F000 62.3M ALLOCATED CSA BY KEY
ESQA 1DB6000 140M 0 144K 16.56.02 144K 16.56.02 144K 32.7M 16.56.02 32.7M 16.56.02 32.7M
ENUC 1000000 13.7M 1 128K 16.56.02 128K 16.56.02 128K 1896K 16.56.02 1896K 16.56.02 1896K
----- 16 MEG BOUNDARY ------ 2 40K 16.56.02 40K 16.56.02 40K 44K 16.56.02 44K 16.56.02 44K
NUCLEUS FD3000 180K 3 0K 16.56.02 0K 0K 0K 16.56.02 0K 0K
SQA E3E000 1620K 4 0K 16.56.02 0K 0K 676K 16.56.02 676K 16.56.02 676K
PLPA C5B000 1932K 5 4K 16.56.02 4K 16.56.02 4K 2840K 16.56.02 2840K 16.56.02 2840K
FLPA C5A000 4K 6 76K 16.56.02 76K 16.56.02 76K 7760K 16.57.41 7788K 16.57.21 7768K
MLPA 0 0K 7 0K 16.56.02 0K 0K 0K 16.56.02 0K 0K
CSA 800000 4456K 8-F 0K 16.56.02 500K 16.56.41 416K 0K 16.56.02 4096K 16.56.41 3413K
PRIVATE 2000 8184K
PSA 0 8K SQA EXPANSION INTO CSA
0K 16.56.02 0K 0K 0K 16.56.02 0K 0K
PLPA INTERMODULE SPACE - 2K IN PLPA AND 307K IN EPLPA
PLPA SPACE REDUNDANT WITH MLPA/FLPA - 0K IN PLPA AND 11K IN EPLPA
---------- BELOW 16M ---------------- --------------- ABOVE 16M -----------
MIN MAX AVG MIN MAX AVG
CSA
FREE PAGES (BYTES) 3564K 16.56.41 4064K 16.56.02 3647K 274M 16.57.21 278M 16.56.02 274M
LARGEST FREE BLOCK 3040K 16.56.02 3040K 16.56.02 3040K 255M 16.56.02 255M 16.56.02 255M
ALLOCATED AREA SIZE 392K 16.56.02 892K 16.56.41 808K 45.7M 16.56.02 49.7M 16.56.41 49.0M
SQA
FREE PAGES (BYTES) 424K 16.56.41 1224K 16.56.02 557K 42.2M 16.56.52 106M 16.56.02 52.9M
LARGEST FREE BLOCK 300K 16.56.41 896K 16.56.02 399K 38.2M 16.56.41 102M 16.56.02 48.9M
ALLOCATED AREA SIZE 724K 16.56.02 1524K 16.56.41 1390K 140M 16.56.02 140M 16.56.02 140M
MAXIMUM POSSIBLE USER REGION - 8184K BELOW AND 1484M ABOVE
DEFINED SIZE OF RUCSA - 1M BELOW AND 23M ABOVE
V I R T U A L S T O R A G E A C T I V I T Y
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z/OS V2R4 SYSTEM ID TRX1 DATE 05/11/2019 INTERVAL 03.31.164
RPT VERSION V2R4 RMF TIME 16.56.01 CYCLE 1.000 SECONDS
COMMON STORAGE DETAIL
ALLOCATED CSA BY SUBPOOL BY KEY (BELOW 16 MEG) ALLOCATED SQA BY SUBPOOL (BELOW 16M)
SUBPOOL 227 SUBPOOL 228 SUBPOOL 231 SUBPOOL 241
SUBPOOL MIN MAX AVG
-------------------------- MINIMUM -----------------------------------
0 28K 16.56.02 4K 16.56.02 4K 16.56.02 108K 16.56.02 226 24K 16.56.02 24K 16.56.02 24K
1 4K 16.56.02 124K 16.56.02 239 44K 16.56.02 44K 16.56.02 44K
2 40K 16.56.02 245 328K 16.56.02 1128K 16.56.41 994K
3
4
5 4K 16.56.02
6 12K 16.56.02 56K 16.56.02 4K 16.56.02 4K 16.56.02
7
8-F 0K 16.56.02 0K 16.56.02
ALL 40K 16.56.02 64K 16.56.02 8K 16.56.02 280K 16.56.02
-------------------------- MAXIMUM -----------------------------------
0 28K 16.56.02 4K 16.56.02 4K 16.56.02 108K 16.56.02
1 4K 16.56.02 124K 16.56.02
2 40K 16.56.02
3
4
5 4K 16.56.02
6 12K 16.56.02 56K 16.56.02 4K 16.56.02 4K 16.56.02
7
8-F 200K 16.56.41 300K 16.56.41
ALL 40K 16.56.02 264K 16.56.41 308K 16.56.41 280K 16.56.02
-------------------------- AVERAGE -----------------------------------
0 28K 4K 4K 108K
1 4K 124K
2 40K
3
4
5 4K
6 12K 56K 4K 4K
7
8-F 166K 250K
ALL 40K 230K 258K 280K
| Field Heading | Meaning |
|---|---|
| STATIC STORAGE MAP | The major storage areas above and below the 16-megabyte line. It includes the name of each area, the address of its lower boundary, and its size, reported in bytes. |
| ALLOCATED CSA/SQA | The MIN, MAX, and AVG values for allocated CSA and SQA, both below and above the 16-megabyte
line. RMF calculates each size by adding the number of bytes assigned to each SQA or CSA subpool.
The report also breaks down allocated CSA by key.
|
| SQA EXPANSION INTO CSA | The MIN, MAX, and AVG size of any expansion of SQA into CSA. SQA does not
expand into RUCSA. |
| PLPA INTERMODULE SPACE | The amount of unused space between the modules in both the PLPA and the EPLPA (the expanded PLPA). If your installation uses a pack list (in the IEAPAK00 Parmlib member), the values reported can help you determine the cost of your packing algorithm in relation to its benefit, a reduction in LPA paging rates, as shown in the paging report. |
| PLPA SPACE REDUNDANT WITH MLPA/FLPA | The amount of space for PLPA occupied by modules that also exist in (E)MLPA and/or (E)FLPA. For EPLPA, reports the amount of space occupied by modules that also exist in (E)MLPA or (E)FLPA. |
| FREE PAGES (BYTES) | The MIN, MAX, and AVG values, in bytes, for the amount of free storage. |
| LARGEST FREE BLOCK | The MIN, MAX, and AVG values, in bytes, for the size of the largest free block. The size of
the largest free block, when compared to the total amount of free storage, is a measure of
fragmentation within the common storage area. For example, when the size of the largest free block
is close to the size of free storage, there is little fragmentation. The size of the largest free
block is also the size of the largest GETMAIN that the system can currently satisfy within CSA or
SQA.
|
| ALLOCATED AREA SIZE | The MIN, MAX, and AVG values, in bytes, for the size of the allocated area. RMF calculates
this value as the difference between the highest and lowest address occupied by allocated storage.
This includes all free blocks that lie between allocated blocks. Because free blocks between
allocated blocks cause an increase in the virtual address range needed to hold the allocated blocks,
consider this value when determining the size of CSA (and ECSA) and SQA (and ESQA). Significant
fragmentation causes this number to be much larger than the amount of storage actually used.
Note: Because the system allocates storage in the ESQA area for both ends of the address range, the
allocated area size is always the same as the total size.
|
| MAXIMUM POSSIBLE USER REGION | The largest size specified on the REGION= JCL parameter that this system can satisfy (assuming a minimal number of DD statements). RMF determines this value, reported for below and above the 16-megabyte line, by examining its own private area; it calculates the size by finding the difference between the bottom of its allocated area at RMF initialization and the start of the user region. There is no guarantee that a particular job can obtain a region of the reported size. For a job that runs under an initiator (as opposed to a job that runs as a started task), the storage that the initiator obtains, reduces the size of the region that the job can obtain. The number of DD statements in the JCL can also reduce the size of the region. The reported region size, however, can indicate whether a job with a known region requirement is likely to obtain the region it requires under the system conditions reflected in the report. |
| DEFINED SIZE OF RUCSA |
The size that is defined in the IEASYSxx parmlib member for RUCSA and extended RUCSA. |