Journal Recovery (was Re: Installing an ext3-based debian system...)

[Robert Bushman]

My understanding of journalling is that it is not
intended to be sufficient to recover from media
failure. I think it is only capable of taking a
piece of media that was interrupted part way through
an access and return it to the state immediately
before the access began. I think that's why the
journal file doesn't bloat, it only has to save the
metadata about the current transaction.

On Wed, 14 Aug 2002, Trent Shipley wrote:

> Why wouldn't you put the journal on a different physical device?  It seems
> this would improve write performance and provide more security since the
> journal and data are unlikely to become corrupt at the same time.
>
> On Wednesday 14 August 2002 12:21 am, Wes Bateman wrote:
> > On Tue, Aug 13, 2002 at 01:35:09PM -0700, Jiva DeVoe wrote:
> > > Can anyone point me to some docs on how to install an Ext3 based debian
> > > system?
> >
> > Hey Jiva!  How've you been? :)
> >
> > Well, I'm pasting a snippet from the ext3 FAQ below.  As for doing it
> > during the install, I think somebody else already addressed that.
> >
> > Since ext3 is basically ext2 with a journal, you can convert ext2 in
> > place, mounted or not.  Tweak /etc/fstab, and poof, ext3 :)  Just make
> > sure your kernel supports it :)  Of course even if it didn't, you could
> > still mount it as ext2.  Quote below:
> >
> > <QUOTE>
> >
> > Q: How do I convert my ext2 partition to ext3? (was: How do I use ext3?)
> > Before you can mount a partition as ext3 you have to create a journal on
> > it. The easiest way to do it is to type:
> >
> >     tune2fs -j /dev/hdaX This can be done on an unmounted or on a
> >     mounted filesystem. If you create the journal on a mounted
> >     filesystem you will see a .journal file. Don't try to delete this
> >     and don't back this up or restore it from backup! If you run tune2fs
> >     -j on an unmounted partition an unvisible journal file will be
> >     created.
> >     Now you can mount the filesystem as ext3 using:
> >
> >         mount -t ext3 /dev/hdaX /mnt/somewhere
> > 	With mke2fs -j /dev/hdaX you can format a partition as ext3 (as
> > 	always it will be also usable as ext2 partion).
> >
> > </QUOTE>
> >
> > Anyway, hope all is well.  Take it easy,
> >
> > Wes
>
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