[linux-lvm] filesystem corruption...

[Heinz J . Mauelshagen]

On Thu, Feb 28, 2002 at 09:35:53AM +0100, Anders Widman wrote:
> 
> >> On Wednesday, February 27, 2002 04:42:28 PM -0700 Andreas Dilger <adilger at clusterfs.com> wrote:
> 
> >>> On Feb 27, 2002  23:36 +0100, Anders Widman wrote:
> >>>> Unfortunatley, something went seriously wrong. I can't mount the disk
> >>>> any more, or use reiserfsck. They (mount/reiserfsck) say there isn't
> >>>> a valid filesystem on the device. Vgscan does however find all devices
> >>>> and can activate the volume group, but reiserfsck doesn't work.
> >>>> 
> >>>> What should I do to be able to save a s much data as possible?
> >>> 
> >>> dd if=/dev/vg/lv of=/new/disk conv=sync,noerror
> 
> >> Then we should be able to use debugreiserfs and reiserfsck to 
> >> find a copy of the super in the log, or just recreate it.
> 
> >> -chris
> 
> > So. How much space would this require on the 'new' disk? The same
> > amount as the entire LV? If that is, it would be impossible (for me,
> > economically) to do this.
> 
> > The disk with bad blocks is 80GB, and I have a "spare" 80GB disk, but
> > not more.
> 
> > //Anders
> 
> Oh, I forgot to ask how I can recover the filsystem
> header/suprtblock.. What exactly is "dd if=/dev/vg/lv of=/new/disk
> conv=sync,noerror" doing to the data, except copying it to the new
> device?

It copies all it can read to another sane device so that youe don't loose
more data if your drive turns worse.

After that, you want to use "reiserfsck --rebuild-sb /dev/vg/lv".


> 
> //Anders
> 
> 
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-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen at Sistina.com                           +49 2626 141200
                                                       FAX 924446
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