From: David Pottage <david@chrestomanci.org>
To: Vimal A R <arvimal@yahoo.in>,
"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: Ideas for a feature implementation
Date: Wed, 13 Aug 2014 12:01:21 +0100 [thread overview]
Message-ID: <53EB4581.8050104@chrestomanci.org> (raw)
In-Reply-To: <53E9F3D6.9040502@gmail.com>
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
next prev parent reply other threads:[~2014-08-13 11:01 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-10 19:21 Ideas for a feature implementation Vimal A R
2014-08-11 2:53 ` Austin S Hemmelgarn
2014-08-11 20:27 ` Chris Murphy
2014-08-12 2:27 ` Austin S Hemmelgarn
2014-08-12 3:04 ` Chris Murphy
2014-08-12 15:52 ` David Pottage
2014-08-12 17:34 ` Austin S Hemmelgarn
2014-08-13 12:26 ` Brendan Hide
2014-08-12 16:38 ` Erkki Seppala
2014-08-12 11:00 ` Konstantinos Skarlatos
2014-08-13 11:01 ` David Pottage [this message]
2014-08-13 11:05 ` Konstantinos Skarlatos
2014-08-17 21:17 ` Chris Murphy
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