i just read in the archive.........

i just read in the archive.........

[Loïc Paillotin]

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? ) 

-- 
Loïc Paillotin
Développeur stagiaire
Qualimucho Média
10, rue de la fontaine au roi, 75011 Paris.
------------------------------------------
Corporate: http://www.qualimucho.com
Perso: http://www.solo-net.fr.st


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Re: i just read in the archive.........

[Matti Aarnio]

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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Re: i just read in the archive.........

[Neil Brown]

> 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? )

This sounds like a 2.2 kernel comment.  There were issues in 2.2.  The
same issues now longer exist in 2.4.

There have been some ext3 issues (that are only related to raid by
coincidence) lately.  I'm not sure if they have all been fixed in an
official release yet.  I know I can get file corruption with 0.9.18 if
I am using data=journal.  With other data modes 0.9.18 should be fine
(in www.{country}.kernel.org/pub/linux/kernel/people/sct/....)

NeilBrown

Re: i just read in the archive.........

[Mark N.]

On Friday 14 June 2002 10:53, 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? )

If you ask me, yes. I would have saved myself alot of trouble had i 
known that fact. It works, but it have messed things up on more that 
one machine for me, so i'm back to ext2.

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Re: i just read in the archive.........

[Luca Berra]

On Fri, Jun 14, 2002 at 12:56:06PM +0200, Mark N. wrote:
> On Friday 14 June 2002 10:53, 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? )
> 
> If you ask me, yes. I would have saved myself alot of trouble had i 
> known that fact. It works, but it have messed things up on more that 
> one machine for me, so i'm back to ext2.

Gosh, this means i have risked to loose all my data in the past year?
I'm running to buy windowsXp now :))))))))))))))))


L.

-- 
Luca Berra -- bluca@comedia.it
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