12.6 Specifying the facility for parallel writes in deferred write processing

The facility for parallel writes in deferred write processing executes multiple processes of deferred write processing in parallel. Figure 12-3 provides an overview of the processing when the facility for parallel writes in deferred write processing is and is not used.

Figure 12-3 Overview of the facility for parallel writes in deferred write processing

[Figure]

Organization of this section
(1) Effects of the facility for parallel writes in deferred write processing
(2) Specification
(3) Considerations

(1) Effects of the facility for parallel writes in deferred write processing

The time required for writing data to disk is reduced because write processing is executed as multiple processes.

(2) Specification

Specify the number of write processes in the pd_dfw_awt_process operand. Also specify the deferred write trigger request ratio in the pd_dbbuff_rate_updpage operand. If the pd_dfw_awt_process operand is omitted, the facility for parallel writes in deferred write processing is disabled.

(3) Considerations

When the facility for parallel writes in deferred write processing is specified, the number of processes increases, thereby increasing the CPU usage.