[Linux-cluster] Cluster maintenance mode ?

[Marc Grimme]

On Wednesday 28 March 2007 16:36:56 David Teigland wrote:
> On Wed, Mar 28, 2007 at 03:59:56PM +0200, Marc Grimme wrote:
> > On Wednesday 28 March 2007 15:38:10 you wrote:
> > > On Wed, Mar 28, 2007 at 10:24:37AM +0200, Marc Grimme wrote:
> > > > I.e. is it possible to detect if the fs was not cleanly unmounted?
> > > > Are there any possibilities?
> > >
> > > I believe fsck checks whether the journal was shut down cleanly (part
> > > of unmount) and cleans it up if it wasn't.  Would you like an option
> > > for fsck to quit if it finds the journal was cleanly shut down by
> > > unmount?
> >
> > That would be an option.
> >
> > But basically it would be great to have something to detect a "corrupt"
> > filesystem or at least to check if the filesystem was not cleanly
> > unmounted.
> >
> > Background is that we had some clusters that crashed because of corrupt
> > gfs-filesystems. But we couldn't see from the dump that those filesystems
> > were corrupt and needed to be fixed.
>
> Ah, I see what you mean -- there's no way to tell that a corrupted fs is
> corrupted (apart from mounting it and eventually tripping over the
> corruption again.)  So, when a node discovers that the fs is corrupted, it
> could set some kind of CORRUPTED flag on the fs.  Mount could then check
> for this flag and return an error.  Or we could possibly automate
> something like:
>
>   if CORRUPTED flag is set
>     try to activate lv exclusively
>     if that works, start fsck
>   else if CORRUPTED flag is not set
>     mount fs
>
> It'll take some thought to figure out how to properly flag an fs when gfs
> detects corruption.
That would do the trick. 

The currupted flag and the exclusiveness of the lvm-logical volume.
>
> Dave

Marc.

-- 
Gruss / Regards,

Marc Grimme
Phone: +49-89 452 3538-14
http://www.atix.de/               http://www.open-sharedroot.org/

**
ATIX - Ges. fuer Informationstechnologie und Consulting mbH
Einsteinstr. 10 - 85716 Unterschleissheim - Germany

Registergericht: Amtsgericht München
Registernummer: HRB 131682
USt.-Id.: DE209485962

Geschäftsführung: Marc Grimme, Mark Hlawatschek, Thomas Merz