On 12/08/14 12:00, Konstantinos Skarlatos wrote:
Maybe help with Andrea Mazzoleni's New RAID library supporting up to
six parities? It seems to be a great feature for btrfs.
https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg31735.html
That would be very cool, but at present vanila RAID 5 or 6 does not work
properly, so I think getting that fully working would be a better idea.
(Unless it would make more sense to merge the whole lot into one bit of
work where RAID 5 or 6 are just a special case of arbitrary parity level
support).
At present, you can write RAID 5 or 6 data, but if anything goes wrong,
btrfs cannot use the parity information to help you get your data back,
so in general you are better off with RAID 1 or 10. Also, I don't think
I/O done in parallel so you get no speed advantage from having multiple
discs either.
--
David Pottage
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