[linux-lvm] Re: One PV destroyed - now the whole VG isn't working anymore

Rickard Olsson richie at webhackande.se
Tue Nov 4 01:47:01 UTC 2003

Samuel Leuthold wrote:

> So can i release the third disk from the LV, reformat and rebind into it
> without loosing the data on disk1 and 2?? 

Yes. But, if you are using striping instead of simple concatenation, you 
are, as the saying goes, toast.

However, it may be possible to salvage most of the data from the third 
disk too.

Method #1.
Use   dd conv=noerror   to raw copy data off the bad disk to a fourth, 
good disk. Swap the bad disk for the new one.

Method #2.
If there's free space on the other two disks (or you can add a fourth 
disk), you can try   pvmove --ignore_read_errors   to move as many 
extents as possible off the bad disk onto the good ones.

> And what about the reiser? Is it
> consistent after this "hack"??

No, in all cases you will need to run reiserfsck, most likely with the 
-rebuild-tree option. But seeing as your disk has badblocks, your FS is 
already in a bad state.

 > Can i do it with these commands??

If your metadata is intact, you won't need most of that example. You can 
search the list archive for my conversation with Heinz a little over a 
month or so ago, we went through this exact thing. :-)

> Whats the meaning of
> the "0" in storage\0 ??

Think of it as an end-of-line character (it's a null-terminated string).

    / Rickard Olsson,IT-Konsult/
   / Telefon: +46 70 635 01 42/
  / http://www.webhackande.se/

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