Re: Ext3+ramdisk journaling problem

[Helge Hafting <helge.hafting@aitel.hist.no>]

Kyle Moffett wrote:

> On Apr 24, 2005, at 21:22, Xin Zhao wrote:
>
> > hi,
> >
> > I used ramdisk as an ext3 journal and mount ext3 file system with
> > option data=journal. It worked fine and speedup the ext3 file system.
>
>
> Uhh, the whole point of a journal is that when the computer goes down
> hard and doesn't have a chance to clean up.  If you put the journal on
> a ramdisk, you might as well just mount it as an ext2 filesystem and
> be done with it.  Without the journal _on_disk_ you get no data or
> filesystem reliability advantages.  If you're after speed, just forgo
> the reliability or buy better disks.
Alternative: Buy a real ramdisk with battery-backup instead of using
a "ramdisk" in system ram.  Such a thing will last across a reboot,
offering both nice speed and all the comforts of a journal.

Helge Hafting

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