You might also consider reading Expanding a ReadyNAS NV+ or Dear Rabbi, Tell Me About Jesus.
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Apr Wed 08
Expanding a ReadyNAS NV+ pt II
As a followup to the the last article I wrote, the expansion of the volume in the ReadyNAS worked as advertised. After getting all of the new 1TB drives switched in over the course of several days, the machine requested a reboot to expand the volume size. As you can see from the image, we now have 2,738 GB of redundant storage! The other nice thing was that (other than the final restart) the volume was online the whole time while I switched out the drives.
written by Kevin in web stuff