I mean exactly like that.
I can't believe that this has never been implemented well.
Maybe there's something to do with RAID.
>From: Jacob Meuser <[EMAIL PROTECTED]>
>Reply-To: Eugene Unix and Gnu/Linux User Group <[EMAIL PROTECTED]>
>To: Eugene Unix and Gnu/Linux User Group <[EMAIL PROTECTED]>
>Subject: Re: [Eug-lug] copy-on-write?
>Date: Wed, 23 Jun 2004 16:10:41 -0701
>
>On Wed, Jun 23, 2004 at 10:40:03PM +0000, Senior Goat wrote:
> > Is there a way to do copy-on-write filesystem access? I think it may also
> > be called drive overlaying or something. I remember that there were
> > several efforts to do this a few years ago, but I haven't heard anything
> > since.
> >
> > I know UML does it above the kernel. I wonder if there's some way to do
> > this so you could, say, mount a CDROM and RAM so that all writes go to RAM,
> > effectively making a CDROM that you could modify until you unmounted it.
>
>You mean like mount_union in BSD?
>maybe try http://vserver.13thfloor.at/TBVFS/ ?
>
> > It would also be good for flash memory where a device can only do so many
> > writes before it dies. I'm thinking of trying to boot off either of these
> > two, a CDROM or a flash disk, but while the system is running it needs to
> > be able to write things. Right now I've got a <400m filesystem in RAM.
>
>--
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