IBM 170 Servers Manual page 41

improve performance by eliminating disk I/O operations.
If communications lines are involved in the batch application, try to limit the number of
communications I/Os by doing fewer (and perhaps larger) larger application sends and receives.
Consider blocking data in the application. Try to place the application on the same system as the
frequently accessed data.
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IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
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Copyright IBM Corp. 2008 Chapter 3 - Batch Performance 41