RE: concurrent I/O on aix server

I've run that exact config with very good results on 2 different production systems, both with 9.2 and 10.2.  

1. If you run 10g, you don't have to mount the filesytems with the cio option, just use filesystemio_options=setall and Oracle will open its datafiles with the CIO flag, so they can be on a regular filesystem along with other executables and any other files, e.g. the Oracle software, if you want (I prefer to separate them anyway)
2. Redologs should definitely be on cio, and these are the only files that require a filesystem created with agblksize=512 since that is the size of IOs to the redo logs, otherwise all IO will be buffered if the block sizes aren't aligned
3. No need to change the block size for the filesystem holding your datafiles, it just has to be a multiple, so your 16k blocks are a multiple of the default 4k jfs2 block size and all is well

There are lots of papers available on this, info in the standard oracle docs and metalink, and even lots of threads in the archives of this oracle-l list. Here's a couple to get you started in case you haven't read these yet:  

http://www-03.ibm.com/systems/p/os/aix/whitepapers/db_perf_aix.pdf  

http://download.oracle.com/docs/cd/B19306_01/server.102/b15658/appa_aix. htm#sthref773  

Regards,
Brandon

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