Storage below 16 MB report
The Storage below 16 MB report provides information on the use of MVS™ and CICS® virtual storage. It contains the information you need to understand your current use of virtual storage below 16 MB and helps you to verify the size values used for the CDSA, UDSA, SDSA, and RDSA and the value set for the DSA limit.
| Field Heading | Description |
|---|---|
| Region size established from REGION= parameter | The region size established from the REGION= parameter in the JCL. If the region requested was greater than 16 megabytes, the region established resides above 16 megabytes, and this field will be a minimum value of 32 megabytes. |
| Storage BELOW 16MB | Description |
| Private Area Region size below 16MB | The private area size below 16 MB, expressed in KB. |
| Max LSQA/SWA storage allocated below 16MB (SYS) | The maximum amount of virtual storage allocated from the local system queue area (LSQA) and the scheduler work area (SWA) subpools below 16 MB, expressed in KB. |
| Max User storage allocated below 16MB (VIRT) | The maximum amount of virtual storage allocated from the user subpools below 16 MB, expressed in KB. |
| System Use | An amount of virtual storage available for system use. |
| RTM | An amount of virtual storage available for use by the MVS recovery and termination manager included for calculation purposes, which could be allocated during a CICS region recovery and termination. |
| Private Area Storage available below 16MB | The amount of storage below 16 MB that could be allocated by increasing the DSALIM parameter or by MVS storage GETMAIN requests. |
| MVS PVT Size | The maximum MVS private area (PVT) size below 16 MB, expressed in KB. |
| MVS CSA Size / Allocated | The MVS common system area (CSA) size and the amount of the MVS CSA allocated below 16 MB, expressed in KB. |
| MVS SQA Size / Allocated | The MVS system queue area (SQA) size and the amount of the MVS SQA allocated below 16 MB, expressed in KB. |
| Current DSA Limit | The current DSA Limit, expressed
in KB. Source field: (SMSDSALIMIT / 1024) |
| Current Allocation for DSAs | The current amount of storage allocated
to the DSAs below 16 MB, expressed in KB. This value may be smaller
or larger than the current DSA limit. Source field: (SMSDSATOTAL / 1024) |
| VIRT minus Current DSA Limit | The total amount of user storage
allocated/used below 16 MB minus the current DSA limit. This indicates
the amount of user storage that is allocated below 16 MB, and is not
allocated to the DSA. Source field: ((VIRT - SMSDSALIMIT) / 1024) |
| Peak Allocation for DSAs | The peak amount of storage allocated
to the DSAs below 16 MB, expressed in KB. This value may be smaller
or larger than the current DSA limit. Source field: (SMSHWMDSATOTAL / 1024) |
| Current DSA Size | The current size of the CDSA, UDSA,
SDSA, or RDSA, expressed in KB. Source field: (SMSDSASZ / 1024) |
| Current DSA Used | The current amount of storage used
in this DSA, expressed in KB. Source field: ((SMSDSASZ - SMSFSTG) / 1024) |
| Current DSA Used as % of DSA | The current amount of storage used
in this DSA, expressed as a percentage of the current DSA size. Source field: (((SMSDSASZ - SMSFSTG) / SMSDSASZ) * 100) |
| Peak DSA Used | The peak amount of storage used in
this DSA, expressed in KB. Source field: (SMSHWMPS / 1024) |
| Peak DSA Size | The peak size of the CDSA, UDSA,
SDSA, or the RDSA, expressed in KB. Source field: (SMSHWMDSASZ / 1024) |
| Cushion Size | The size of the cushion, expressed
in KB. The cushion forms part of the CDSA, UDSA, SDSA, or the RDSA,
and is the amount of storage below which CICS goes
short on storage (SOS). Source field: (SMSCSIZE / 1024) |
| Free Storage (inc. Cushion) | The current amount of free storage
in this DSA, expressed in KB. Source field: (SMSFSTG / 1024) |
| Peak Free Storage | The peak amount of free storage in
this DSA, expressed in KB. Source field: (SMSHWMFSTG / 1024) |
| Lowest Free Storage | The lowest amount of free storage
in this DSA, expressed in KB. Source field: (SMSLWMFSTG / 1024) |
| Largest Free Area | The length of the largest contiguous
free area in the CDSA, UDSA, SDSA, or RDSA, expressed in bytes. Source field: (SMSLFA / 1024) |
| Largest Free Area as % of DSA | The largest contiguous free area
in the CDSA, UDSA, SDSA, or RDSA, expressed as a percentage of the
current DSA size. Source field: ((SMSLFA / SMSDSASZ) * 100) |
| Largest Free/Free Storage | An indication of the storage fragmentation
in this DSA. This value is calculated by dividing the Largest Free Area(SMSLFA) by the Free storage(SMSFSTG). If the ratio is small, this DSA is fragmented. Source field: (SMSLFA / SMSFSTG) |
| Current number of extents | The number of extents
currently allocated to this DSA. Source field: SMSEXTS |
| Number of extents added | The number of extents
added to the DSA since the last time statistics were recorded. Source field: SMSEXTSA |
| Number of extents released | The number of extents
that were released from the DSA since the last time statistics were
recorded. Source field: SMSEXTSR |
| Getmain Requests | The number of GETMAIN requests from
the CDSA, UDSA, SDSA, or RDSA. Source field: SMSGMREQ |
| Freemain Requests | The number of FREEMAIN requests from
the CDSA, UDSA, SDSA, or RDSA. Source field: SMSFMREQ |
| Current number of Subpools | The current number of subpools (domain
and task) in the CDSA, UDSA, SDSA, or RDSA. Source field: SMSCSUBP |
| Add Subpool Requests | The number of ADD_SUBPOOL requests
to create a subpool (domain or task) from the CDSA, UDSA, SDSA, or
RDSA. Source field: SMSASR |
| Delete Subpool Requests | The number of DELETE_SUBPOOL requests
(domain or task) from the CDSA, UDSA, SDSA, or RDSA. Source field: SMSDSR |
| Times no storage returned | The number of times
a GETMAIN request with SUSPEND(NO) returned the condition INSUFFICIENT_STORAGE. Source field: SMSCRISS |
| Times request suspended | The number of times
a GETMAIN request with SUSPEND(YES) was suspended because of insufficient
storage to satisfy the request at that moment.. Source field: SMSUCSS |
| Current requests suspended | The number of GETMAIN
requests that are currently suspended for storage. Source field: SMSCSS |
| Peak requests suspended | The peak number
of GETMAIN requests that were suspended for storage. Source field: SMSHWMSS |
| Requests purged while waiting | The number of requests
that were purged while suspended for storage. Source field: SMSPWWS |
| Times cushion released | The number of times
a GETMAIN request caused the storage cushion to be released. The cushion
is said to be released when the number of free pages drops below the
number of pages in the cushion and there are no more free extents
available to increase the size of this DSA. Source field: SMSCREL |
| Times Short-On-Storage | The number of times CICS went
SOS in this DSA, where SOS means that the cushion is currently in
use, or at least one task is suspended for storage, or both. This
field applies to the CDSA, UDSA, SDSA, and RDSA. Source field: SMSSOS |
| Total time Short-On-Storage | The accumulated
time that CICS has been SOS in this DSA. Source field: SMSTSOS |
| Average Short-On-Storage time | The average time that CICS has
been SOS in this DSA. Source field: (SMSTSOS / SMSSOS) |
| Storage Violations | The number of storage
violations recorded in the DSA. This
field applies to the CDSA, UDSA, SDSA, and RDSA. Source field: SMSSV |
| Access | The type of access of the DSA. Values
are CICS, USER, or READONLY. If storage protection
is not active, storage areas revert to an access type of CICS, except those in the RDSA.
Source field: SMSACCESS |