Setup for INN usenet server

[kevin]

Hello,

I am about to embark on setting up a INN based
usenet server with a full news feed.

This is with linux.

I was thinking of having 4 seperate 30gb hard disks,
software raiding 2 30gb hard drives for a 60gb used for
the article tree and seperate drives for history/log and
overview files.

Is this enough storage for a full feed?

(If articles were ditched every 3-4 days or compression
was used to keep them a week.) 

Does INN support on-the-fly compression or is their
other OS compression tools I should use.


Advice appreciatted

Kevin