z/OS Communications Server: CSM Guide
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Number of buffers when buffer pool is created using application settings

z/OS Communications Server: CSM Guide
SC27-3647-00

When the first CREATE_POOL request is received, CSM creates a pool of buffers. The INITBUF parameter specifies the initial number of buffers created in that pool.

Requirement: INITBUF is required on the CREATE_POOL request.
The range for INITBUF is 0 - 9999. If 0 is specified, only the base pool structure is created. In this case, the pool is expanded on the first GET_BUFFER request based on the EXPBUF parameter value. If a value is specified that is outside of the range for INITBUF, one of the following values is used (depending on the size of the buffers in the pool).
Pool size Initial number of buffers (INITBUF)
4096 64
16384 32
32768 16
61440 16
184320 2

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