Subject: Re: Overlay ramdisk on filesystem?
From: Erik Tews <erik@debian.franken.de>
To: Timothy Miller <miller@techsource.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
In-Reply-To: <407EF9C4.4070207@techsource.com>
References: <407EF9C4.4070207@techsource.com>
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Date: Fri, 16 Apr 2004 21:38:11 +0200
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Am Do, den 15.04.2004 schrieb Timothy Miller um 23:08:
> I have a feeling that this may be a bit too off-topic, but I'm doing 
> some Linux and hardware performance tests, and some of the tests will 
> put the hardware into an unstable state which could get memory errors 
> which could cause filesystem corruption.
> 
> I would like to know how I could overlay a RAM disk over a read-only 
> filesystem so that all new files and modified files end up in the RAM 
> disk, but old files are read from the disk.  This way, when I reboot, 
> the disk reverts back.

This could be possible using a ramdisk, a filesystem on a disk (which
could be a read only block device like a cdrom too), device-mapper and
its snapshot-target. But I did not try yet.

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