By the way, RAID 10 is not a mirrored set of Raid 5.  Just for the sake
of a memory jog on my part, here are all of the RAID levels:

RAID 0: non-redundant striping of drives
RAID 1: drive mirroring (always an even number of drives)
RAID 2: byte striping with moving parity (obsolete)
RAID 3: byte striping with a fixed parity drive (obsolete)
RAID 4: block striping with a fixed parity drive (obsolete)
RAID 5: block striping with striped parity
RAID 6: block striping with dual parity stripes (allows two drives to
fail)

RAID 1+0 or RAID 10: Mirrors of RAID 0 stripes (always an even number of
drives)
RAID 0+3 or RAID 35: Striped RAID 3 (obsolete)
RAID 0+5 or RAID 50: Striped RAID 5
RAID 1+5 or RAID 51: Mirrors of RAID 5 strips

The last one is a play on "area 51", but it's the most fail-safe of all
of the RAID levels, used by military and extremely wealthy ignorants
that believe data loss only comes from failed hardware.

> I don't like RAID50, at least how it was configured in one of 
> the links you provided.  I prefer to stay away from any RAID 
> done in software.  RAID10, a mirrored set of RAID5 is nice, 
> but I've never gone for it.  Sets of mirrors and RAID5 arrays 
> with an extra drive for a hot spare are my preference for 
> high end systems.
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