From: Holger.VanKoll@SWISSCOM.COM
Date: Thu Mar 27 2003 - 05:56:17 EST
Unfortunately, we were driven to our 32-bit/JFS2 decision due to the
availability of Oracle 8i for 64-bit as well as our desire to have some
of the performance enhancements introduced by JFS2, namely a direct-I/O
mount option.
in aix 4.3.3 (I think ML10) there is a unsupported/undocumented
mount -o=dio
option
I am not sure if we are talking about the same, so here is what it does:
if files are accessed on this filesystem, their data isnt buffered in
the aix-filecache.
useful if you know that those files arent read again soon and you cant
tell your application to use O_DIRECT
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