Administrator's Reference

TAPEIOBUFS

Specifies how many tape I/O buffers TSM can use to write to or read from the IBM 3590 tape media. The default is 1.

Note:TSM determines the value based on settings for the TXNBYTELIMIT client option and the MOVEBATCHSIZE, MOVESIZETHRESH, TXNGROUPMAX, AND USELARGEBUFFERS server options. TSM uses the maximum number of buffers it can fill before reaching the end of the data transfer buffer or the end of the transaction. A larger number of I/O buffers may increase I/O throughput but require more memory. The memory required is determined by the following formula:

number_of_buffers x 32K x mount limit

Syntax

>>-TAPEIOBUFS--number_of_buffers-------------------------------><
 

Parameters

number_of_buffers
Specifies the number of I/O buffers TSM can use to write to or read from an IBM 3590 tape media. You can specify an integer from 1 to 9. A value of 1 means that no overlapped BSAM I/O is used. For a value greater than 1, TSM can use up to that number of buffers to overlap the I/O with BSAM.

Examples

Specify that TSM can use up to 9 buffers to overlap the I/O with BSAM:

tapeiobufs 9


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