Lustre discuss - Aug 2010 - needs_recovery flag?

Still very new to lustre, and now I''m going over the failover part. I
use tune2fs to set MMP, but I would get this warning about
needs_recovery, do a journal replay or else the setting will be lost.
With dumpe2fs I could see the needs_recovery flag was set on all of
the OST/MDT. Reading over the recovery part, nothing really matching
what was going on here, I elected to use e2fsck -fn then e2fsck -fp on
all of the OST/MDT, now the needs_recovery flag is gone and I was able
to set MMP to on.  So my question is, what did I do to get this sort
of thing to happen? And how to avoid it?

David

-- 
Personally, I liked the university. They gave us money and facilities,
we didn''t have to produce anything! You''ve never been out of
college!
You don''t know what it''s like out there! I''ve worked
in the private
sector. They expect results. -Ray Ghostbusters

The main issue is that tune2fs changing the superblock while the journal is not
recovered means any changes will be lost. It is hard to get this 100% correct,
since it is possible to set some tunable on the mounted superblock, and
replaying the journal in that case would be bad.

Running ''e2fsck /dev/xxxx'' (no options) should be enough to
replay the journal, without doing a full filesystem scan.

Cheers, Andreas

On 2010-08-16, at 11:20, David Noriega <tsk133 at my.utsa.edu> wrote:
> Still very new to lustre, and now I''m going over the failover
part. I
> use tune2fs to set MMP, but I would get this warning about
> needs_recovery, do a journal replay or else the setting will be lost.
> With dumpe2fs I could see the needs_recovery flag was set on all of
> the OST/MDT. Reading over the recovery part, nothing really matching
> what was going on here, I elected to use e2fsck -fn then e2fsck -fp on
> all of the OST/MDT, now the needs_recovery flag is gone and I was able
> to set MMP to on.  So my question is, what did I do to get this sort
> of thing to happen? And how to avoid it?
> 
> David
> 
> -- 
> Personally, I liked the university. They gave us money and facilities,
> we didn''t have to produce anything! You''ve never been out
of college!
> You don''t know what it''s like out there! I''ve
worked in the private
> sector. They expect results. -Ray Ghostbusters
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> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
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