If you talk "nice" to your IBM rep (or search the RS/6000 documents), you'll
find tuning info about JFS vs. RAW -- I suggest JFS to customers, unless
they're adamant about trying RAW;  TSM performance for most sites I've seen
since 3.1 has been very satisfactory, there were specific line items in 2.1,
3.1 and 3.7 which addressed AIX performance for TSM server with JFS... if
you carefully heed tuning tips for NIC settings as well as VMTUNE settings,
you should get satisfactory performance.


Don France
Technical Architect -- Tivoli Certified Consultant
Tivoli Storage Manager, WinNT/2K, AIX/Unix, OS/390
San Jose, Ca
(408) 257-3037
mailto:don_france AT att DOT net

Professional Association of Contract Employees
(P.A.C.E. -- www.pacepros.com)



-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
Cowperthwaite, Eric
Sent: Sunday, September 22, 2002 10:43 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: RAW volumes or not


I run my TSM servers on Solaris 8. I use raw volumes built with Solstice
DiskSuite (Solaris Volume Manager in Solaris 9). When I first brought TSM up
on Solaris I put my db, logs and disk pools on UFS with logging and the
performance was awful. Solaris 8 UFS is actually quite fast for most
applications so I was rather surprised at the performance problem. I've
never tried TSM using VxFS, I saw no need to. The performance with raw
volumes is very good.

JFS is not native to Solaris, and I don't know of any way to use JFS on
Solaris. If you want a journalled file system use VxFS or UFS with logging.
With the improvements in DiskSuite I really can't see much reason to use
Veritas. It's costly and for most environments only gives minimal
performance improvements.

Eric Cowperthwaite
EDS Operations Solutions

> -----Original Message-----
> From: Arni Snorri Eggertsson [mailto:arnie AT GORMUR DOT COM]
> Sent: Saturday, September 21, 2002 12:04 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: RAW volumes or not
>
>
> 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
>