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From
SubjectRe: The missing RAID level
Date
Followup to:  <045P8FJ12@server5.heliogroup.fr>
By author: Hubert Tonneau <hubert.tonneau@fullpliant.org>
In newsgroup: linux.dev.kernel
>
> So, one very interesting possibility would be to have an extra RAID level that
> would do the following:
> assuming that you connect 5+1 partitions, then you get 5 md partitions, not a
> single one, with the following properties:
> . any read to mdX goes straight forward to reading the underlying partition.
> . any write goes staight forward to writting the underlying partition, but also
> updates the parity on the extra partition.
>

You have just described RAID 4.

-hpa
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