a curve fitting


Hi folks.

I've been thinking that it'd be very nice, since I'm a sysadmin, to have
some software that'll graph disk usage over time, and use some form of
curve fitting to predict when a disk might fill up based on past
utilization changes.

Does anyone have any thoughts on what might be a good curve fitting
algorithm for this sort of purpose? About all I'm familiar with are least
squares and splines, and I don't really know when to use them.

Thanks!

.