This is useful information. Thank you so much.
--- bbullock <bbullock AT MICRON DOT COM> wrote:
> I've seen all the replies and they are all
> I've seen all the replies and they are all
> good, but I don't think
> they will solve your problem. I think the most
> telling problem is that when
> you run backups individually, they work great, but
> when you have multiple
> sessions and processes running at the same time,
> they all seem to bog down.
> We are running 2 of our TSM servers on M80s and they
> just scream.
>
> It sounds like what bit us when we upgraded
> to AIX 4.3.3. Because of
> the way TSM threads it's jobs, if you don't have a
> certain setting in AIX,
> your TSM server will become a single threaded beast
> and really bog down.
> From the TSM 4.1.1 readme:
>
> _______________________________
>
**********************************************************************
> * Possible performance degradation due to threading
> *
>
**********************************************************************
>
> On some systems Tivoli Storage Manager for AIX may
> exhibit significant
> performance degradation due to TSM using user
> threads instead of
> kernel threads.
>
> This may be an AIX problem however, to avoid the
> performance degradation
> you should set the following environment variables
> before you start
> the server.
>
> export AIXTHREAD_MNRATIO=1:1
> export AIXTHREAD_SCOPE=S
> _______________________________
>
>
> Making these changes don't require a reboot,
> so it's worth a shot to
> add these in, make sure they get sourced into your
> current environment (by
> logging out & back in, or just running these 2
> lines) and then stop and
> start the ADSM service.
>
>
> Ben Bullock
> Unix system manager
> Micron Technology Inc.
>
>
> > -----Original Message-----
> > From: Chuck Lam [mailto:chuck_lam AT YAHOO DOT COM]
> > Sent: Tuesday, July 10, 2001 5:47 PM
> > To: ADSM-L AT VM.MARIST DOT EDU
> > Subject: TSM server performance help
> >
> >
> > Server: M80 running AIX 4.3.3, 4GB RAM, 768MB ps
> > DiskStoragePool, Rlog, & Database on all
> on a
> > SAN via fibre channel connection.
> > TSM version: 4.1
> >
> > This is a newly configured system. We are
> conducting
> > tests on it. When we tried to do a few backups by
> > themselves, they seemed to get done pretty fast.
> > However, when we had 4 migration processes and a
> > couple of backups going at the same time,
> everything
> > slowed down to a halt. According to my client,
> his
> > backup transfer speed was about 100MB per minute.
> Can
> > anyone give me some suggestions to improve the
> > performance? I have attached the 'topas' reading
> of
> > this server.
> >
> > TIA
> >
> >
> > __________________________________________________
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