On Tue, Feb 05, 2013 at 01:30:41PM +0100, Roy Sigurd Karlsbakk wrote:

I beleive using 22 drives in a single RAID-5 is something like BASE jumping with a large umbrella. You should at least use RAID-6, and perhaps even split up the RAID into smaller ones.

Point taken, but this is actually a large dataset which could be recreated
if necessary (i.e. it's derived from other data), and is also to be copied
to another server.