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Date: Tue, 18 Sep 2001 11:28:29 +0100
From: "Stephen C. Tweedie" <sct@redhat.com>
To: Juan <piernas@ditec.um.es>
Cc: linux-kernel@vger.kernel.org, Stephen Tweedie <sct@redhat.com>
Subject: Re: Ext3 journal on its own device?
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In-Reply-To: <3BA61CC0.C9ECC8A0@ditec.um.es>; from piernas@ditec.um.es on Mon, Sep 17, 2001 at 05:54:40PM +0200
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Hi,

On Mon, Sep 17, 2001 at 05:54:40PM +0200, Juan wrote:
 
> I have been browsing the Ext3 source (version 0.0.7a), and it seems
> impossible to use a block device as an Ext3 journal. Is that true?.

In the 2.2 code (ext3-0.0.7a), the journal has to be part of the
filesystem.  The current e2fsprogs and 2.4 ext3 code (ext3-0.9.9) does
support journals on other devices, but there's more support to be
added before it's truly complete (in particular we want to support
several filesystems journaling to a single shared journal spool.)

The separate-journal-disk code hasn't been tested as much as the
default journal-on-main-filesystem code, and it's not officially
supported, so the format might change in the future.  But it should
work.

Cheers,
 Stephen