Hi Farren

I discovered something: I created a very big disk pool, I stopped backing up
to tape and wento disks : my backups are running at 27GBytes/Hour, which is
very good on a 100mb network. If I make my backup go to my SCSI library
connected on the SAN via a SAN Data Gateway, the performances are bad again.
So, I have to focus on my SAN configuration. The problem is between the TSM
Server and the library.

Thanks for answering,


                        Ruddy Stouder
                        Senior Technical Consultant
                        TSM Certified Consultant
                        I.R.I.S.
                        Rue du Bosquet 10 - Parc Scientifique de
Louvain-La-Neuve
                        B-1348 Mont-Saint-Guibert
                        ruddy.stouder AT irislink DOT com
                        <http://www.irislink.com>
                        Tel: +32 (0)10 48 75 09  -  Fax: +32 (0)10 48 75 40




-----Original Message-----
From: Farren Minns [mailto:fminns AT WILEY.CO DOT UK] 
Sent: jeudi 6 mars 2003 15:42
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Poor TSM Performances


Hi Ruddy

We too are having a similar problem on our Solaris server and any client we
back up. We have tested so many things, but nothing helps.

Network cards and switches set to 100Mb/s full duplex. All of the
reccomended settings in the 4.2 Performance Tuning guide have been set. We
have done tests when the server and client are idle and we are only backing
up one or two files (thus limiting database access), and still the network
transfer rate is low. Normally 1-1.5 Mbytes per sec. Even worse over night
when other backups are running. We can ftp files at 6-8MB/s, but for TSM it
just isn't working.

If we have any luck, i'll let you know.

Thanks

Farren - John Wiley & Sons Ltd


Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>

Sent by:        "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>

To:        ADSM-L AT VM.MARIST DOT EDU
cc:
Subject:        Poor TSM Performances


I am quite disappointed by the TSM software performance.

Let's take :
WIN2000 client, Bi-Pro, nothing running on the machine except TSM client
WIN2000 server, Bi-Pro, nothing running on the machine except TSM Server

Client is backing up to server, using 100Mb TCP/IP => Throughput of
5,84GB/Hour => 13,3 Mb/sec !!!

With LAN-Free, result are the same !!!

So, having machines with CPU used with less than 10%, LAN card used at 10%,
where is the bottleneck ? Backing up to disk or to LTO tapes does not help
increasing the performance.

Following parameters are set :
TCPBUFFSIZE=128
TCPWINDOWSIZE=63
TCPNODELAY=YES (AND TESTED WITH NO)
LARGECOMMBUFFERS=YES (AND TESTED WITH NO)

I was hoping to reach at least 25GB/Hours via a TCP/IP 100Mb network and
50GB/Hours via LAN-Free to LAN device

Many thanks in advance for any feddback


Ruddy Stouder
Senior Technical Consultant
TSM Certified Consultant
I.R.I.S.
Rue du Bosquet 10 - Parc Scientifique de
Louvain-La-Neuve
B-1348 Mont-Saint-Guibert
ruddy.stouder AT irislink DOT com
<http://www.irislink.com <http://www.irislink.com> >
Tel: +32 (0)10 48 75 09  -  Fax: +32 (0)10 48 75 40