Chris,
TCPWINDOWSIZE should be set to 63 on Win2k.
apart from that ,have you tried

TxnGroupMax       256
TxnByteLimit          2097152(for BU direct to LTO or DLT)
TcpNoDelay          yes

and maybe you can take an  instr_client_detail trace and take a look at the
DataVerb figure, see if it's high.

Cordiali saluti
Gianluca Mariani
Tivoli TSM Global Response Team, Roma
Via Sciangai 53, Roma
 phones : +39(0)659664598
                   +393351270554 (mobile)
gianluca_mariani AT it.ibm DOT com



                      Chris_Cundall
                      <ccundall@SAGITTA        To:       ADSM-L AT VM.MARIST 
DOT EDU
                      -PS.COM>                 cc:
                      Sent by: "ADSM:          Subject:  optimising 
tcpwindowsize and tcpbuffsizes
                      Dist Stor
                      Manager"
                      <[email protected]
                      .EDU>


                      10/07/2002 10:56
                      Please respond to
                      "ADSM: Dist Stor
                      Manager"





Hi,

Does any one know a calculation or method for setting/optimising
tcpwindowsize and tcpbuffsize on Windows 2K machines?

I have currently set them to :

TCPBUFFSIZE      32
TCPWINDOWSIZE    61

But am still getting very slow speeds. Named pipes on the server gives me
about 13M a second where as TCP gives me about 3M

Any ideas would be greatly appreciated,

Cheers

Chris