we have several DELL 6800 with LSI 4e/DC adapter cards
(128 MB cache) in it. DELL 6800 run under Redhar AS
4.0 and ORACLE 9ir2. When I configured DELL 6800
server local disks (Mirror or RAID 5), ther have two
I/O policy to choice - direct IO and cache IO.

I doing simple test by copy files between differents
disk set and found "direct IO" performance better
than "cache IO". It is against what I read before. I
used to saw documents from SUN and IBM said "large
disk array cache will improve I/O performance".

Any one has suggestion FOR ORACLE server which I/O
policy should I setup?

Thanks.

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