HVSHARE

HVSHARE={xxxxxxxxxxG}
        {xxxxxxxxxxT}
        {xxxxxxxxxxP}

This parameter specifies the size of the high virtual shared area. The IARV64 macro allows multiple address spaces to share virtual storage above 2 gigabytes (see z/OS MVS Programming: Authorized Assembler Services Reference EDT-IXGfor details). You can define how much virtual storage can be shared.

The size of the HVSHARE value determines where the system places the virtual shared area. If you specify a value less than 2 terabytes (2 T), the system obtains storage that straddles the 4-terabyte line. Half of the storage comes from above the 4-terabyte line, and half of the storage comes from below the 4-terabyte line. If you specify a value larger than 2 T, the system obtains storage starting at the 2-terabyte line.

The value that you specify is rounded up to a 64-gigabyte boundary.

You can also specify the HVSHARE value by responding to message IEA101A.

Value range: 0 gigabytes (0 G) to 1 exabyte (which is 1048576 terabytes or 1024 petabytes)

Default: 510 terabytes (510 T); placement will start at the 2 T line.

Associated parmlib member: None.