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OCFS is as fast as raw?

From: Jesse, Rich <Rich.Jesse_at_qtiworld.com>
Date: Thu, 18 Sep 2003 14:25:02 -0800
Message-ID: <F001.005D0696.20030918142502@fatcity.com>


After perusing the OOW'03 presentations, I see that Win Coekaerts' presentation says "IO throughput [on OCFS] is equivalent to RAW IO". Has anyone seen this behavior? It's entirely possible (probable!) that I didn't do something correctly, given the bastardization I needed to do (installed on RH9 because AS2.1 won't support our hardware), but I saw OCFS performance about 40-50 times slower than RAW (rough estimate).

I didn't implement the OCFS fileutils as I wasn't going to manually do anything with the files. Surely the oracle binary doesn't call dd, cp, and mv directly for it's file management and data I/O, does it? Is it the "comm_voting=1" in the /etc/ocfs.conf file? Or is it more likely to be async IO (my guess)? Or a combo?

Anyone with experience on this? Anyone attend Mr C's presentation?

Thanks,
Rich

Rich Jesse                           System/Database Administrator
rjesse_at_qtiworld.com                  Quad/Tech Inc, Sussex, WI USA

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Author: Jesse, Rich
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