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Re: [linux-lvm] vg disappeared after replacing disc in raid10



Thanks for the answer. 
I am sorry I will not be able to point you to the exact problem that caused the disruption of the volume group. 
I did not make any checks before I started disassembling and reassembling the array. 

I did recreate the physical volume and the volume group using pvcreate and vgcreate, please see the description of the problem 
on ubuntuforums for further details.

I now have a volume group vol0, but still no logical volumes, and vgcfgrestore still does not work.
If you have any hints as to what to do now, I would be most delighted.

 
On Mar 25, 2013, at 20:00 , Stuart D Gathman <stuart bmsi com> wrote:

> Long ago, Nostradamus foresaw that on 03/25/2013 10:04 AM, Björn
> Nadrowski would write:
>> After replacing a disc in my raid10 system (ubuntu 12.04), my volume group (that contained all my data and my system) was gone.
>> 
>> Problem description is here:
>> 
>> http://ubuntuforums.org/showthread.php?t=2128504
>> 
>> I managed to retrieve the metadata of the volume group and the logical volumes underneath, but I did not succeed using
>> 
>> vgcfgrestore 
>> 
>> successfully in order to regain access to my data.
>> 
>> It seems I might have to try dmsetup, but I am afraid I might destroy my data if I use it. I have no experience with that program.
>> 
> No immediate help, but I would have been more paranoid under knoppix,
> and checked for the volume group (vgscan) *before* failing the bad disk,
> and *before* adding the replacement.  Running pvs at those points would
> be advisable also.
> 
> I just installed a customer system with raid10, so I am *very*
> interested in what went wrong.  I have only used raid1 to this point,
> and have been *very* impressed with the improved performance of 4 disks
> with raid10 vs. 2 with raid1. 
> 
> Here is a theory to toss out:  raid10 on 3 disks can tolerate only 1
> disk failure.  Maybe there were 2?  Maybe replaced the wrong drive? 
> 
> Does pvs show the raid10 drive as a PV?  There is no point trying to use
> vgcfgrestore until you have some PVs to restore it to.
> Where did you find the metadata?  From a backup?  From the beginning of
> the raid10 drive?
> 
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/



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