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Re: AIX 5.2 move from JFS to JFS2

From: Syed Jaffar Hussain <>
Date: Wed, 27 Jun 2007 17:14:04 +0300
Message-ID: <>

When we enabled CIO option the filesystem that has online redo logs, it resolved the 'log file sync' wait event heavily.

What is your db_block_buffers size? Are you using version 8i?


On 6/27/07, <> wrote:
> Now that I have upgraded our production systems from to I
> can see via truss that Oracle is taking advantage of our newly implemented
> JFS2 filesystems and opening the datafiles using CIO.
> We are experiencing higher WIO percentages since the upgrade.
> My sysadmn has suggested that perhaps I need to increase db_block_buffers
> to make up for the lack of buffering at the FS level now that we are using
> JFS2.
> Does anyone have any experience and/or thoughts regarding this?
> TIA,
> Patty
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Best Regards,
Syed Jaffar Hussain
Oracle ACE
8i,9i & 10g OCP DBA
"Winners don't do different things. They do things differently."

Received on Wed Jun 27 2007 - 09:14:04 CDT

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