direct IO ot cache IO?

From: dba1 mcc <mccdba1_at_yahoo.com>
Date: Thu, 11 May 2006 14:06:17 -0700 (PDT)
Message-ID: <20060511210617.78080.qmail@web60816.mail.yahoo.com>

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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Received on Thu May 11 2006 - 16:06:17 CDT