z/OS Communications Server: SNA Network Implementation Guide
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Input/output buffers

z/OS Communications Server: SNA Network Implementation Guide
SC27-3672-01

The IOBUF start option defines the amount of storage available for I/O buffers. The XPANLIM parameter is used to increase storage available for I/O buffers when reaching the constraint level.

For a detail description of the XPANLIM parameter, see Guidelines for dynamic expansion.

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