I have used both on AIX, and really have never seen a difference either way.

I use LVM raw volumes for both, since I find them easier to deal with.  TSM
mirrors the database/log volumes, and AIX mirrors the storage pool volumes.

TSM V5 can utilize AIO for JFS under with AIX, and this is a different ball-
game altogether.  I am not actually sure if JFS is native on Solaris, you have
to have Veritas installed, and this will render a significant improvment over
the native Solaris filesystem I/O.  Check with your sources to see if they
are indeed running Veritas on their Sun systems.  I have compared VXFS and
AIX JFS on machines of the same performance characteristics, and they perform
about the same (under various tests VXFS did beat JFS, I used IOZONE).

Seeing arguments either way, I use raw LV's for ease of configuation and
smaller overhead (no jfslog, etc).

good luck.

bob

On Sat, Sep 21, 2002 at 07:03:38PM -0000, Arni Snorri Eggertsson wrote:
> Hiya,
>
> I've been reading about using RAW volumes for database and diskpool volumes, 
> my impression is that when running AIX and using JFS the benefits are 
> trivial. However I've seen people talking about 200-300% performance increase 
> when running TSM on Solaris.
>
> What I am wondering is if anyone has actually done experiments with this on 
> AIX on a real environment, i.e. performance check using JFS on one hand and 
> then RAW volumes on the other?
>
>
>
> thanks,
> Arni Snorri Eggertsson
> arnie AT gormur DOT com