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To: Padraig Brady <padraig.brady@corvil.com>
cc: Rob van Nieuwkerk <robn@verdi.et.tudelft.nl>, linux-kernel@vger.kernel.org
Subject: Re: ext3 fs: no userspace writes == no disk writes ? 
In-Reply-To: Message from Padraig Brady <padraig.brady@corvil.com> 
   of "Fri, 20 Sep 2002 10:19:07 BST." <3D8AE80B.9090902@corvil.com> 
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Date: Fri, 20 Sep 2002 11:26:12 +0200
From: Rob van Nieuwkerk <robn@verdi.et.tudelft.nl>
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> Padraig Brady wrote:
> > Rob van Nieuwkerk wrote:
> > 
> >> Hi P?draig,
> >>
> >> P?draig Brady wrote:
> >>
> >>> Rob van Nieuwkerk wrote:
> >>>
> >>>> Hi Alan,
> >>>>
> >>>>
> >>>>> On Fri, 2002-09-20 at 00:04, Andrew Morton wrote:
> >>>>>
> >>>>>
> >>>>>> There are frequently written areas of an ext3 filesystem - the
> >>>>>> journal, the superblock.  Those would wear out pretty quickly.
> >>>>>
> >>>>>
> >>>>> CF is -supposed- to wear level.
> >>>>
> >>>>
> >>>> Yes I know.
> >>>>
> >>>> But I haven't been able to find any specs from any CF manufacturer
> >>>> about this mechanism, percentage of spare sectors or number of allowed
> >>>> write-cycles in general.
> >>>
> >>>
> >>> me either.
> >>>
> >>> Why don't you just mount the fs ro ?
> >>>
> >>> P?draig
> >>
> >>
> >>
> >> Ehm .., because I need to store data on it ..
> > 
> > 
> > Ehm, well remount,rw before you store data on it
> > and remount,ro when finished?
> 
> Note you can organise things (links from /etc/various /dev/various /var
> to ramdisk/tmpfs/...) so that you never have to mount the CF rw.

Yes I know.  That will happen for the root partition anyway.
The whole discussion is about a dedicated data logging partition/fs
on the CF.

	greetings,
	Rob van Nieuwkerk
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