Use Cheops for mapping and monitoring:

ftp://ftp.marko.net/pub/cheops/ 

I have fallen in love with it.

Can also be found on FreshMeat.

JLF Sends...
Being a Unix system administrator is like being a tech in a biological warfare
laboratory, except that none of the substances are labeled consistently, any
of the compounds are just as likely to kill you by themselves as they are when
mixed with one another, and it is never clear what distinction is made between
a catastrophic failure in the lab and a successful test in the field.
                                                                (--M. Tiemann)