From: Ray Van Dolson <rayvd@bludgeon.org>
To: Diego Calleja <diegocg@gmail.com>
Cc: Gordan Bobic <gordan@bobich.net>,
BTRFS MAILING LIST <linux-btrfs@vger.kernel.org>
Subject: Re: Offline Deduplication for Btrfs
Date: Wed, 5 Jan 2011 11:01:41 -0800 [thread overview]
Message-ID: <20110105190139.GA32671@bludgeon.org> (raw)
In-Reply-To: <201101051941.13268.diegocg@gmail.com>
On Wed, Jan 05, 2011 at 07:41:13PM +0100, Diego Calleja wrote:
> On Mi=E9rcoles, 5 de Enero de 2011 18:42:42 Gordan Bobic escribi=F3:
> > So by doing the hash indexing offline, the total amount of disk I/O=
=20
> > required effectively doubles, and the amount of CPU spent on doing =
the=20
> > hashing is in no way reduced.
>=20
> But there are people who might want to avoid temporally the extra cos=
t
> of online dedup, and do it offline when the server load is smaller.
>=20
> In my opinion, both online and offline dedup have valid use cases, an=
d
> the best choice is probably implement both.
Question from an end-user. When we say "offline" deduplication, are we
talking about post-process deduplication (a la what Data ONTAP does
with their SIS implementation) during which the underlying file system
data continues to be available, or a process that needs exclusive
access ot the blocks to do its job?
Ray
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next prev parent reply other threads:[~2011-01-05 19:01 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-05 16:36 Offline Deduplication for Btrfs Josef Bacik
2011-01-05 16:36 ` [PATCH] Btrfs: add extent-same ioctl for dedup Josef Bacik
2011-01-05 17:50 ` Simon Farnsworth
2011-01-05 16:36 ` [PATCH] Btrfs-progs: add dedup functionality Josef Bacik
2011-01-05 17:42 ` Offline Deduplication for Btrfs Gordan Bobic
2011-01-05 18:41 ` Diego Calleja
2011-01-05 19:01 ` Ray Van Dolson [this message]
2011-01-05 20:27 ` Gordan Bobic
2011-01-05 20:28 ` Josef Bacik
2011-01-05 20:25 ` Gordan Bobic
2011-01-05 21:14 ` Diego Calleja
2011-01-05 21:21 ` Gordan Bobic
2011-01-05 19:46 ` Josef Bacik
2011-01-05 19:58 ` Lars Wirzenius
2011-01-05 20:15 ` Josef Bacik
2011-01-05 20:34 ` Freddie Cash
2011-01-05 21:07 ` Lars Wirzenius
2011-01-05 20:12 ` Freddie Cash
2011-01-05 20:46 ` Gordan Bobic
[not found] ` <4D250B3C.6010708@shiftmail.org>
2011-01-06 1:03 ` Gordan Bobic
2011-01-06 1:56 ` Spelic
2011-01-06 10:39 ` Gordan Bobic
2011-01-06 3:33 ` Freddie Cash
2011-01-06 1:19 ` Spelic
2011-01-06 3:58 ` Peter A
2011-01-06 10:48 ` Gordan Bobic
2011-01-06 13:33 ` Peter A
2011-01-06 14:00 ` Gordan Bobic
2011-01-06 14:52 ` Peter A
2011-01-06 15:07 ` Gordan Bobic
2011-01-06 16:11 ` Peter A
2011-01-06 18:35 ` Chris Mason
2011-01-08 0:27 ` Peter A
2011-01-06 14:30 ` Tomasz Torcz
2011-01-06 14:49 ` Gordan Bobic
2011-01-06 1:29 ` Chris Mason
2011-01-06 10:33 ` Gordan Bobic
2011-01-10 15:28 ` Ric Wheeler
2011-01-10 15:37 ` Josef Bacik
2011-01-10 15:39 ` Chris Mason
2011-01-10 15:43 ` Josef Bacik
2011-01-06 12:18 ` Simon Farnsworth
2011-01-06 12:29 ` Gordan Bobic
2011-01-06 13:30 ` Simon Farnsworth
2011-01-06 14:20 ` Ondřej Bílka
2011-01-06 14:41 ` Gordan Bobic
2011-01-06 15:37 ` Ondřej Bílka
2011-01-06 8:25 ` Yan, Zheng
-- strict thread matches above, loose matches on Subject: below --
2011-01-06 9:37 Tomasz Chmielewski
2011-01-06 9:51 ` Mike Hommey
2011-01-06 16:57 ` Hubert Kario
2011-01-06 10:52 ` Gordan Bobic
2011-01-16 0:18 Arjen Nienhuis
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