linux-kernel - Re: Notes on support for multiple devices for a single filesystem

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Message-Id: <1229549184.27170.88.camel@think.oraclecorp.com>
Date:	Wed, 17 Dec 2008 16:26:24 -0500
From:	Chris Mason <chris.mason@...cle.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>, adilger@....com,
	sfr@...b.auug.org.au, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: Notes on support for multiple devices for a single filesystem

On Wed, 2008-12-17 at 22:20 +0100, Kay Sievers wrote:
> On Wed, Dec 17, 2008 at 21:58, Chris Mason <chris.mason@...cle.com> wrote:
> > On Wed, 2008-12-17 at 11:53 -0800, Andrew Morton wrote:
> >
> > There are other bits and pieces like high speed front end caching
> > devices that would be difficult in MD/LVM, but since I don't have that
> > coded yet I suppose they don't really count...
> 
> Features like the very nice and useful directory-based snapshots would
> also not be possible with simple block-based multi-devices, right?

At least for btrfs, the snapshotting is independent from the
multi-device code, and you still get snapshotting on single device
filesystems.

-chris


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