>md/raid already works happily with different sized drives from
>different manufacturers ...

>So I still cannot see anything particularly new.

As compared to md of conventional disk partitions, it brings the ability 
to create and delete arrays without shutting down all use of the physical 
disks (to update the partition tables).  (LVM gives you that too).  It 
also makes managing space much easier because the component devices don't 
have to be carved from contiguous space on the physical disks.

Neither of those benefits is specific to RAID, but you could probably say 
that RAID multiplies the problems they address.

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