linux-kernel - Re: [RFC PATCH 0/5] Btrfs: Add hot data tracking functionality

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Message-ID: <AANLkTi=x9q1XOu_6F2hOv_ZPoM+McKz9Nv2Q5GZNfa4a@mail.gmail.com>
Date:	Tue, 27 Jul 2010 18:18:23 -0500
From:	Ben Chociej <bchociej@...il.com>
To:	diegocg@...il.com
Cc:	chris.mason@...cle.com, linux-btrfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, cmm@...ibm.com, bcchocie@...ibm.com,
	mrlupfer@...ibm.com, crscott@...ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/5] Btrfs: Add hot data tracking functionality

On Tue, Jul 27, 2010 at 6:10 PM, Diego Calleja <diegocg@...il.com> wrote:
> On Miércoles, 28 de Julio de 2010 00:00:18 bchociej@...il.com escribió:
>> With Btrfs's COW approach, an external cache (where data is moved to
>> SSD, rather than just cached there) makes a lot of sense. Though these
>
> As I understand it, what your proyect intends to do is to move "hot"
> data to a SSD which would be part of a Btrfs pool, and not do any
> kind of SSD caching, as bcache (http://lwn.net/Articles/394672/) does?
>

Yes, that's correct. It's likely not going to be a cache in the
traditional sense, since the entire capacity of both HDD and SSD would
be available.

BC
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