If you only need a disk space thingy, then just follow Improv's advice.
If you need additional monitoring, then you might be better setting up an SNMP server on the machine and querying it all the values that you need. If you follow this path, then you can use Net::SNMP module to make your own scripts. You can also use a contrib collection from MRTG software distribution. MRTG is a something specifically design for monitoring, and (surprise, surprise!) is written in Perl. I'll also add a link to MRTG section on my site, in case you decide to look. :)
Leonid Mamtchenkov
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