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Also see these notes on Managing Oracle disk I/O in AIX.

IBM AIX and Direct I/O

IBM has published an excellent case study with Oracle9i Database on AIX 5L version 5.2, illustrating how to optimizer AIX direct I/O for Oracle 9i databases:

http://www-03.ibm.com/servers/aix/whitepapers/db_perf_aix.pdf

This paper includes a benchmark test that illustrates the relative disk speed for various disk configurations and concludes:

“The performance experiments described in this paper show that using JFS2 Concurrent I/O for databases results in performance comparable to that achieved through the use of raw logical volumes for database storage, while providing greater flexibility and ease of administration.

The throughput of the database application under Concurrent I/O was three times the throughput achieved with Direct I/O – a 200% improvement - and lagged the performance on raw logical volumes by only 8%.”

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