find a simply way to monitor the fs size

[Geoff Wild]

Or,...if you want to monitor disk space and a whole lot more, look at OVO or BigBrother:

http://www.bb4.org/

Rgds...Geoff

[David Nixon]

For this I would use the Event Monitoring System. You can set up monitoring from under the Resource Management section of SAM.
EMS can monitor for the event
of a file systems available MB falling below
a threshhold value. The notifications go
to email, or logs. It is often useful to set up an "emswarn" email alias.

David.

[Florian Heigl (new acc)]

Most SNMP Agents can do that automatically - using EMS as already stated might be even easier.