CA-L-Serv › Define Managed Files › Buffer Pools › Override VSAM Defaults for Private Buffer Pools

Previous Topic: Evaluate Buffer Pool Usage

Next Topic: Performance Adjustments

Override VSAM Defaults for Private Buffer Pools

CA-L-Serv provides ADDFILE options that you can use to override VSAM defaults:

Performance Value

ADDFILE parameter

Default Value

Number of data buffers

BUFND(nnnnn)

5

Number of index buffers

BUFNI(nnnn)

5

Number of VSAM placeholders (which limits the number of concurrent VSAM requests for a file)

STRNO(nnn)

5

For example, to allocate 32 data buffers and 32 index buffers in the private buffer pool for file DPMFPDF2, specify this command in the parameter data set:

ADDFILE DPMFPDF2 BUFND(32) BUFNI(32)

Important! These options can cause I/O problems if used improperly. When the number of buffers and placeholders is too low, performance may suffer. When the number is too high, you may run out of virtual storage. Therefore, fully consider the impact on virtual storage and performance before specifying the BUFND, BUFNI, and STRNO options.