Well, we don't advertise them as such, but several options can be used to
throttle performance (just as increasing their values can improve
performance, decreasing their values can inhibit performance):

- Turn down the TCPBUFFSIZE and TCPWINDOWSIZE settings

- Turn on client compression (uses more CPU, which may or may not impact
network performance, but will reduce the amount of data going across the
network, which may contribute to the desired effect)

- Set RESOURCEUTILIZATION to its lowest setting

- Set TXNBYTELIMIT to its lowest setting

- On the TSM server, reduce TXNGROUPMAX (if you want to do this for all
TSM clients)

- On the TSM server, set VALIDATEPROTOCOL=ALL for the node (note that this
will consume more CPU on client and server in order to calculate CRCs, see
Admin Guide and Reference for more info)

There may be some others, but those are the ones that come immediately to
mind.

Regards,

Andy

Andy Raibeck
IBM Software Group
Tivoli Storage Manager Client Development
Internal Notes e-mail: Andrew Raibeck/Tucson/IBM@IBMUS
Internet e-mail: storman AT us.eyebm DOT com (change eye to i to reply)

The only dumb question is the one that goes unasked.
The command line is your friend.
"Good enough" is the enemy of excellence.




Eric Winters <ewinters AT AU1.IBM DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
12/02/2002 15:45
Please respond to "ADSM: Dist Stor Manager"


        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:
        Subject:        Can backup throughput be deliberately throttled on a 
per node basis.



I have an unusual situation where we are interested in deliberately
throttling network performance, that's right, we might want to slow down
backups from nodes and from server to server.
Furthermore it has been suggested to me that this capability is available
in TSM.

Apart from tweaking the communication options to impair client and server
communication performance (breaks my heart to consider doing it), is there
something specificly designed to restrict bandwidth usage within TSM?

I appreciate the feedback,

Regards,

Eric Winters
Sydney Australia