redhat paper on i/o options

"Red Hat® Enterprise Linux® 4 enables Oracle® Database 10g file system
applications to perform within 3% of raw I/O due to enhancements to the
ext3 file system and through the support of both Direct and Asynchronous
I/O."

http://www.redhat.com/magazine/013nov05/features/oracle/

How do you/they measure "data access patterns with very little data re-use?"
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http://www.freelists.org/webpage/oracle-l


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