Tools for monitoring harddisk activities?

1. tools for monitoring network activities & traffics

Is there any tools in public domain that can monitor the
network activities and traffics? (says, tcplogger, nfswatch,
snmp, ... etc). We have some Ultrix DEC and SunOS SUN servers.
These servers and their clients are linked up
by SynOptics 3000 concentrators. We would like to tune up our
network but we need to have some data of our network activities
and traffics first.

I would very appreciate it if anyone could inform me these tools
via e-mail. Thanks.

Alan S. H. Lam
Department of Information Engineering, CUHK, Hong Kong

Tel: (852) 609 8364 Fax: (852) 603 5032

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