Messages in this thread | | | Subject | Re: Overlay ramdisk on filesystem? | From | Florian Weimer <> | Date | Thu, 15 Apr 2004 23:13:40 +0200 |
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Timothy Miller <miller@techsource.com> writes:
> 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.
In the presence of memory errors, all bets are off anyway.
> 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.
You might have to tweak the underlying file system, too. IIRC, ext2 avoids to reallocate freshly deallocated blocks, to prevent fragmentation. This will waste a lot of RAM on the long run.
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