I can't help with the LInux stuff,but I will say just be careful with your RAID5 arrays. They're awesome up to a certain point. Basically remember that you can only ever have ONE drive fail in a RAID5 array. If you lose more than one you're toast. So, as you keep expanding the array, your chances of experiencing a concurrent drive failure increases. I'd say once you reach five or six drives, it's time to start a new array, since you're using IDE instead of SCSI.
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