Technote (FAQ)
Question
The 'GETVIS SVA,ALL' command shows the ISTSVF subpool. What is the ISTSVF subpool used for?.
Answer
In this sample output from the GETVIS SVA,ALL command,
GETVIS SVA,ALL
AR 0015 GETVIS USAGE SVA-24 SVA-ANY SVA-24 SV
AR 0015 AREA SIZE: 3,556K 14,968K
AR 0015 USED AREA: 3,452K 9,004K MAX. EVER USED: 3,556K 10
AR 0015 FREE AREA: 104K 5,964K LARGEST FREE: 20K 4
AR 0015 SUMMARY REPORT
AR 0015 SUBPOOL REQUEST <--SVA-24-AREA--- --SVA-ANY-AREA-->
AR 0015 Default 1,552K 44K
AR 0015 ISTSVF 896K 1,884K
...
ISTSVF is the SVA (Shared Virtual Area) subpool used by VTAM for I/O Buffers (IOBUF) In z/VSE. You can move this subpool to 31-bit SVA by setting IOBUF31=YES in the VTAM start options list.
IST is the prefix for VTAM, SV stands for SVA and F stands for fixed
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