The facility for parallel writes in deferred write processing executes multiple processes of deferred write processing in parallel. The following figure provides an overview of two cases: the first uses the facility for parallel writes. and the second does not use the facility.
Figure 11-3 Overview of the facility for parallel writes in deferred write processing
For deferred write processing, the time required to write to disk is reduced because write processing is executed by multiple parallel WRITE processes.
Specify in the pd_dfw_awt_process operand the number of parallel WRITE processes for deferred write processing, which performs write processing. 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.
If you specify the facility for parallel writes in deferred write processing, the number of parallel WRITE processes for deferred write processing increases. As a result, the CPU usage rate also increases