Ref: 11640075
Title: Tuning 3+Share Parameters
Date: 4/20/90

Copyright 3Com Corporation, 1991.  All rights reserved.

Tune parameters for 3+Share with the 3OPT program on the server.

1.  Start the 3OPT program in off-line mode if you have not
    already done so.

    See "Starting 3OPT, Off-Line Access" in the 3+ Network Tuning
    Guide.

2.  In the 3OPT main menu select the 3+Share component and choose
    the CHANGE command.

3.  When the 3+Share screen appears, adjust the parameters as
    appropriate.

    See "3+Share Screen" later in this section.

4.  Press [Ctrl] + A to return to the 3OPT main menu.

5.  Choose Save to save your changes.

6.  Choose Quit to exit the 3OPT program.



3+Share Screen

3+Share settings are important because 3+Backup runs on 3+Share.
Important settings and configurations include:

    Message buffer size
    Number of message buffers
    Concurrent requests
    Receive buffers
    Transmit buffers

Message buffer size--The message buffer size must be appropriate
for the network environment, that is, the applications being run
and the type of cable and computers being used.  See "Tuning
Share" in the 3+ Network Tuning Guide for details.

Note:  Both token ring and Macintosh networks need a message
buffer size of 2608 for optimum performance.


Number of Message Buffers--This number cannot exceed the
concurrent requests setting by more than one.  It must equal the
threads setting.  The only reason you would set this number
higher would be to support remote users connected through
3+NetConnect or 3+Remote.

If not enough byte range locks are available for the number of
message buffers, the backup attempt will fail.  See "Tuning
Share" in the 3+ Network Tuning Guide for details.


Concurrent Requests--This setting should be equal to or less than
the threads setting on the CIOSYS parameters screen.  It must
never exceed the threads setting.  If you set concurrent requests
too high, you will experience server problems.  For example, the
server may attempt to process more operations than its CIOSYS can
handle, causing Network retry errors on the workstation.  See
"Tuning Share" in the 3+ Network Tuning Guide for details.


Receive Buffers and Transmit Buffers--These parameters should be
set as described in "Tuning Share" in the 3+ Network Tuning
Guide.

It is very important that these parameters are set correctly to
work with the message buffer size on the server.  If this setting
is incorrect, there will be a large number of retransmissions and
increased network activity when you back up across the network.

Messages indicating incorrect settings show up in the STATUS.LOG
file in the \3ROOT directory on the server.  An example of such a
message is "Mindsspp command 26 returned error 4."  This error
occurs if the receive buffers and transmit buffers settings are
too far out of step with each other or if they are not set
correctly with the message buffer size.  Receive buffers are
approximately 80% of transmit buffers.  Both the source and
backup servers must be tuned correctly.  See "Monitoring Use and
Isolating Problems" in the 3+Administrator's Guide, Volume 1 for
details on viewing the STATUS.LOG file.
