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Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide
Large chunk sizes also tend to increase the performance of random reads and writes.
It is recommended that you use a chunk size of 10 to 20 times the average request
size, rounded up to the nearest multiple of 64. In general, a chunk size of 256 works
well for UNIX
®
systems; 128 works well for OpenVMS™ systems.
Increasing the Data Transfer Rate
A small chunk size relative to the average request size increases the data transfer rate
by allowing multiple disk drives to participate in one I/O request. This concept is
shown in Figure 3–16.
Figure 3–16. Chunk Size Smaller than the Request Size
Applications such as CAD, image processing, data collection and reduction, and
sequential file processing tend to require high data-transfer rates.
CXO-5172A-MC
Chunk size = 128k (256 blocks)
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