[Lustre-devel] dealloc in 1.8.4 and RHEL5.5

Bernd Schubert bs_lists at aakef.fastmail.fm
Wed Jul 28 17:18:14 PDT 2010

On Thursday, July 29, 2010, Bernd Schubert wrote:
> Hi all,
> I see that dealloc is disabled in 1.8.4 by default also for RedHat kernels.
> I think it is a good idea to do that for RHEL 54 kernels, as I run into
> slight filesystem corruption on our test cluster, which I cannot explain
> except that the filesystem might have caused it. That was with 1.8.3 and
> ext4-ldiskfs with enabled dealloc.
> Now my question is if dealloc really should be disabled for 1.8.4, as it
> will be based on RHEL 5.5 kernels. And as ext4 in 5.5 is based on 2.6.32,
> dealloc should work without much risk, shouldn't it? Or does it just need
> some testing? Unfortunately, I do not have a suitable reproducer for the
> issue above.

I think I see what is still missing - quota related dealloc patches have not 
been merged according to the 5.5 ext4 patch description.

Bernd Schubert
DataDirect Networks

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