On Fri, Jun 14, 2002 at 10:53:43AM +0200, Loïc Paillotin wrote:
> I justy read in the archive that software raid would'nt work with ext3
> file system. Is that true ? ( i mean is that still true? )
RAID1 + EXT3 + SMP used to be a recipe for a deadlock, right now I am
not quite sure. I am running one SMP machine with IDE disks with
kernel 2.4.19-pre8smp and that hasn't groaked with saturation tests.
Hmm.. I am not sure that I have done saturation testing with that
new kernel either, but it contains a bunch of EXT3 fixes, which
might help.
What is definite is that RAID1 + EXT3 with UNIPROCESSOR KERNEL
(even if machine has multiple processors) does not deadlock.
So, if you are willing to run with uniprocessor kernel (effectively
to ditch additional CPUs at your SMP box), you will be safe.
If you want to test deadlocking (at a SMP machine with SMP kernel),
you can do it with:
dd if=/dev/zero bs=1024k of=test.file count=6000
Choose the count to be at least 2-3 times the amount of memory
in your machine.
If that doesn't deadlock, you are safe.
> --
> Loïc Paillotin
/Matti Aarnio
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