Re: The missing RAID level

From: H. Peter Anvin
Date: Wed Apr 21 2004 - 21:56:49 EST

Followup to: <045P8FJ12@xxxxxxxxxxxxxxxxxxxxx>
By author: Hubert Tonneau <hubert.tonneau@xxxxxxxxxxxxxx>
In newsgroup:
> 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.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at