[linux-lvm] Drive failure

[Herbert Poetzl]

On Thu, May 15, 2003 at 09:09:17AM -0500, B. J. Zolp wrote:
> On Thursday 15 May 2003 00:59, Herbert Poetzl wrote:
> > On Wed, May 14, 2003 at 10:41:37AM -0500, B. J. Zolp wrote:
> > > One of the drives in my volume group is developing bad sectors on it. 
> > > When I mount the logical volume spanning that drive my entire machine
> > > locks up. Should I be able to dd (without reading the bad sectors) the
> > > failing drive (assuming it spins up and reads all the good sectors) to
> > > the replacement drive, then run fsck on the unmounted volume and then
> > > mount the volume with minimal data loss?
> >
> > I guess, this should work ... but make sure, that
> > you do the copy operation on another system, otherwise
> > the LVM stuff could/will be irritated by two diffent
> > disks with the same signature (after copying over)
> >
> 
> What if the LVM is down?  Then when the copy is complete I replace the bad 
> drive with the replacement and bring the LVM back up.  That seems like it 
> should work.

just make sure that the kernel or any start script
scans for vgs or recreates lvmtab or makes any updates
and/or changes to the pvs ...

given that, it should work ...

> > > The other option I can think of is remove that drive from the volume and
> > > then remount it, but that would mean a loss of everything that is one the
> > > failing drive, plus I am not sure how reiserfs works with large chunks of
> > > its file system removed like that.
> >
> > I wouldn't do that, neither with reiserfs nor with
> > any other unix filesystem ... only as last escape
> > if you disk is completely unreadable ...
> >
> > anyway, if possible make a copy of ALL disks involved
> > before you do any fscking so you can go back and
> > try any other approach ...
> >
> > best,
> > Herbert
> >
> > > thanks
> > >
> > > bjz
> > >
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> > > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> >
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> 
> 
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