Re: LVM array, one disk failed

[Tuomas Jormola <tjormola@cc.hut.fi>]

On Sat, 2002-12-28 at 10:39, Oleg Drokin wrote:
> Hello!
> 
> On Sat, Dec 28, 2002 at 05:07:31AM +0200, Tuomas Jormola wrote:
> > I have a 110GiB LVM array constructed using EVMS. It consists of three
> > IDE hard disks from which the last one died the other day. The
> > filesystem is ReiserFS, of course. Array is a linear one and there was
> > about 15GiB free space when disk died so I'm hoping there was a somewhat
> > resonable way to recover the data on two disks that are full and in
> > front of the array. The failed disk is totally dead, not just a couple
> > of bad sectors. It spins but it's not detected on boot. When I try to
> > mount the volume with only two disks connected, it get this:
> > sh-2029: reiserfs read_bitmaps: bitmap block (#19234816) reading failed
> > reiserfs_read_super: unable to read bitmap
> 
> This is hardware problem ;)
> 
> But if your raid setup does not use any stripping, this is possible to
> rercover from such a situation.
> The easiest way that comes to mind is to add another disk instead failed one so
> that all of the FS blocks still accessible.
> Then you can mount the FS and all the data would be intact (only bitmaps and
> other stuff from failed disk would be corrupted).
> 
> If you do not plan to add anymore drives or if you just don't have
> spare drive, you probably can run reiserfsck --rebuild-sb and after
> couple of questions it will write updated superblock that
> respects changed filesystem size (actually for this to work you first need
> to tell your LVM to report current volume size that is now shorter
> than it was at creation time).
reiserfsck says

Reiserfs with standard journal found, but there was specified a journal dev

I guess guess it's bad thing :/

-- 
Tuomas Jormola <tjormola@cc.hut.fi>