Ext3 journal on its own device?

Ext3 journal on its own device?

[Juan]

Hi all!

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?.

TIA.
-- 
D. Juan Piernas Cánovas
Departamento de Ingeniería y Tecnología de Computadores
Facultad de Informática. Universidad de Murcia
Campus de Espinardo - 30080 Murcia (SPAIN)
Tel.: +34968367657    Fax: +34968364151
email: piernas@ditec.um.es
PGP public key:
http://pgp.rediris.es:11371/pks/lookup?search=piernas%40ditec.um.es&op=index

Re: Ext3 journal on its own device?

[Christian Bornträger]

> 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?.

As the actual version of ext3 is 0.99 you should consider an update....
It is possible to have the ext3 journal on a second device with ext3 0.95 or 
higher.

Check out http://www.uow.edu.au/~andrewm/linux/ext3/ext3-usage.html

greetings 

Christian Bornträger

Re: Ext3 journal on its own device?

[Juan]

Christian Bornträger escribió:
> 
> > 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?.
> 
> As the actual version of ext3 is 0.99 you should consider an update....
> It is possible to have the ext3 journal on a second device with ext3 0.95 or
> higher.
> 
> Check out http://www.uow.edu.au/~andrewm/linux/ext3/ext3-usage.html
> 
> greetings
> 
> Christian Bornträger
Thanks.

But the problem is that I need to use Linux 2.2.19, and the latest Ext3
version for that kernel is 0.0.7a, isn't it?.


-- 
D. Juan Piernas Cánovas
Departamento de Ingeniería y Tecnología de Computadores
Facultad de Informática. Universidad de Murcia
Campus de Espinardo - 30080 Murcia (SPAIN)
Tel.: +34968367657    Fax: +34968364151
email: piernas@ditec.um.es
PGP public key:
http://pgp.rediris.es:11371/pks/lookup?search=piernas%40ditec.um.es&op=index

Re: Ext3 journal on its own device?

[Christian Bornträger]

> But the problem is that I need to use Linux 2.2.19, and the latest Ext3
> version for that kernel is 0.0.7a, isn't it?.

good point. I am not sure if ext3 is still maintained for linux 2.2, but I 
doubt it. Andrew or Stephen should be able to answer this question.

But with 0.0.7a it is not possible to have an external journal.

greetings

Christian Bornträger

Re: Ext3 journal on its own device?

[Andrew Morton]

Christian Bornträger wrote:
> 
> > But the problem is that I need to use Linux 2.2.19, and the latest Ext3
> > version for that kernel is 0.0.7a, isn't it?.
> 
> good point. I am not sure if ext3 is still maintained for linux 2.2, but I
> doubt it. Andrew or Stephen should be able to answer this question.

Stephen is actively maintaining ext3 for the 2.2 kernels, but
it is definitely in "maintenance mode".

> But with 0.0.7a it is not possible to have an external journal.
> 

That's true.

-

Re: Ext3 journal on its own device?

[Stephen C. Tweedie]

Hi,

On Mon, Sep 17, 2001 at 06:39:10PM +0200, Christian Bornträger wrote:
> > But the problem is that I need to use Linux 2.2.19, and the latest Ext3
> > version for that kernel is 0.0.7a, isn't it?.
> 
> good point. I am not sure if ext3 is still maintained for linux 2.2, but I 
> doubt it. Andrew or Stephen should be able to answer this question.

Critical bugfixes only for 2.2.  All current development is 2.4 only.
There are _tons_ of improvements in 2.4 which will not be back-ported;
2.4 is the official current ext3.

Cheers,
 Stephen

Re: Ext3 journal on its own device?

[Andreas Dilger]

On Sep 17, 2001  17:54 +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?.

The code to support this is not included in the 2.2 ext3 only in 2.4 ext3.
There was a patch for 2.2 journal devices long ago, but I'm not sure if
it was updated to work with the new "format" of the external journal.  It
was posted to ext2-devel by Marcelo Tossatti, probably 6 months ago or more.

Cheers, Andreas
-- 
Andreas Dilger  \ "If a man ate a pound of pasta and a pound of antipasto,
                 \  would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/               -- Dogbert

Re: Ext3 journal on its own device?

[Stephen C. Tweedie]

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