On 13/8/2014 2:01 μμ, David Pottage wrote:
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.
Yeah, thats one of the features I am waiting to get finished, because I
already have 5 multi disk systems that i would prefer to migrate to
RAID5/6 from RAID1/JBOD that they are now.
I dont know what is the best sequencing, I just think that these are
great patches/features and its a pity for them to languish.
--
Konstantinos Skarlatos
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