[Lustre-discuss] e2fsck

[Andreas Dilger]

On Feb 21, 2009  01:09 -0500, Robin Humble wrote:
> On Fri, Feb 20, 2009 at 02:10:50PM -0700, Andreas Dilger wrote:
> >On Feb 19, 2009  20:42 -0500, Robin Humble wrote:
> >> in 5 out of 6 e2fsck's I do after an OSS crash, I get one free blocks
> >> count wrong and often a bitmap in a group that wants to be corrected.
> >> 
> >> is this normal?
> >> or is it an ldiskfs or an e2fsck bug?
> >
> >Do you have the "MMP" feature enabled?
> 
> no, MMP is off.
> 
> there is a small chance that this is the first time the partitions have
> been fsck'd since MMP was turned off though - I can't be sure about that.

That would probably be the cause - the MMP function uses a single block,
and it needs to be freed by e2fsck when the feature is disabled.  We
should probably fix tune2fs to do this at the time MMP is turned off.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.