[Novalug] "clandestine" lvm disk move? (SOLVED)

[Kurt Yoder]

On Apr 6, 2007, at 7:33 AM, Michael Stone wrote:

> On Thu, Apr 05, 2007 at 11:26:58PM -0400, Kurt Yoder wrote:
>> device names. So I need to figure out where lvm keeps its device   
>> names and modify it.
>
> The lvm configuration is stored on the disks. It doesn't care what  
> they are called. One thing you *do not* want to do is activate lvm  
> when both disks are in the system. (Make sure you "vgchange -an"  
> before you start your copy, and don't turn it back on until you're  
> done. If root or another critical fs area is on the lvm you'll have  
> to use knoppix or somesuch to do the copy.)

Thanks. I tried a few things already before checking the list this  
morning, and now my lvm group is back up. This is is a Debian system,  
so I have an /etc/init.d/lvm init script. This gave me a place to start:

root at corn:~# /etc/init.d/lvm start
Setting up LVM Volume Groups...
   Reading all physical volumes.  This may take a while...
   Found duplicate PV f9SBB2eKbQeaVo1Kr2cKT9Gkj5xtTfm7: using /dev/ 
hdc not /dev/sda
   Found volume group "mygroup" using metadata type lvm2
   Found duplicate PV f9SBB2eKbQeaVo1Kr2cKT9Gkj5xtTfm7: using /dev/ 
hdc not /dev/sda
   1 logical volume(s) in volume group "mygroup" now active
root at corn:~# /etc/init.d/lvm stop
Shutting down LVM Volume Groups...
   Found duplicate PV f9SBB2eKbQeaVo1Kr2cKT9Gkj5xtTfm7: using /dev/ 
hdc not /dev/sda
   0 logical volume(s) in volume group "mygroup" now active
root at corn:~# pvremove /dev/sda
   Found duplicate PV f9SBB2eKbQeaVo1Kr2cKT9Gkj5xtTfm7: using /dev/ 
hdc not /dev/sda
   Found duplicate PV f9SBB2eKbQeaVo1Kr2cKT9Gkj5xtTfm7: using /dev/ 
sda not /dev/hdc
   Found duplicate PV f9SBB2eKbQeaVo1Kr2cKT9Gkj5xtTfm7: using /dev/ 
hdc not /dev/sda
   Can't pvremove physical volume "/dev/sda" of volume group  
"mygroup" without -ff
root at corn:~# pvremove -ff /dev/sda
   Found duplicate PV f9SBB2eKbQeaVo1Kr2cKT9Gkj5xtTfm7: using /dev/ 
hdc not /dev/sda
   Found duplicate PV f9SBB2eKbQeaVo1Kr2cKT9Gkj5xtTfm7: using /dev/ 
sda not /dev/hdc
   Found duplicate PV f9SBB2eKbQeaVo1Kr2cKT9Gkj5xtTfm7: using /dev/ 
hdc not /dev/sda
Really WIPE LABELS from physical volume "/dev/sda" of volume group  
"mygroup" [y/n]? y
   WARNING: Wiping physical volume label from /dev/sda of volume  
group "mygroup"
   Labels on physical volume "/dev/sda" successfully wiped


 From there, I was able to start LVM normally. I didn't even need to  
remove the disk out of the system for it to work. Thanks for the  
information about not needing to think about possible moving disks  
though. I was lucky and only lost 32 K off the bad disk, so that's  
only a few seconds of some random Myth recording.





--

Kurt Yoder
http://yoderhome.com