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Re: copying lvm with the same name



Aldo Foot venit, vidit, dixit 17.03.2009 18:45:
> On Mon, Mar 16, 2009 at 8:28 PM, Frank Cox <theatre sasktel net> wrote:
>> One of my computers died and, of course, there is un-backed-up data on there
>> that I want to recover if I can.  The hard drive seems to be in good shape so I
>> took it out of the dead box and installed it on this computer (my main desktop
>> machine.)
>>
>> I have been doing a bunch of reading about logical volumes and some of what
>> I've found is  self-contradictory, incomplete and stuff that I just don't
>> really understand (yet.)  And, as you can imagine, since this is my main
>> desktop machine I'm not terribly anxious to just start playing around with
>> the lvm configuration without knowing what I'm doing.
>>
>> Here are my findings so far:
>>
>> [root mutt ~]# pvscan
>>  PV /dev/sdb2   VG VolGroup00   lvm2 [279.25 GB / 32.00 MB free]
>>  PV /dev/sda2   VG VolGroup00   lvm2 [465.56 GB / 32.00 MB free]
>>  Total: 2 [744.81 GB] / in use: 2 [744.81 GB] / in no VG: 0 [0   ]
>> [root mutt ~]# lvscan
>>  ACTIVE            '/dev/VolGroup00/LogVol00' [277.28 GB] inherit
>>  ACTIVE            '/dev/VolGroup00/LogVol01' [1.94 GB] inherit
>>
>> It looks like the machine can see the second drive and the lvm that's on it
>> /dev/sdb2, but it has the same VolGroup name as /dev/sda2.
>>
>> What I would like to do is twofold:  First, and most importantly, I would like
>> to mount it as-is so I can copy my data off of there.  Second, I would like to
>> re-format it and add it to the storage capacity that I already have on this
>> machine. Heck, if it's still a good drive I might as well put it to use.
>>
>> So, how can I mount VolGroup00 that's on /dev/sdb2?  The vgchange command
>> followed by a simple mount command looks like what I want to do, but what's the
>> syntax?  As I said, I really don't want to bugger up my primary hard drive....
>>
>> --
>> MELVILLE THEATRE ~ Melville Sask ~ http://www.melvilletheatre.com
> __
> 
> Get info on the Volume Group (change 00 to 01 for the other volume)
> 	vgdisplay -v VolGroup00
> 	
> Look at the Physical Volumes list; the hard drive partitions
> are shown individually. That's how you identify with hard
> drive or partition belongs to what Volume Group.
> Somewhere in the Logical Volume info it will say:
> 	"LV Status              available"
> 
> To fix inconsistencies, check the filesystem
> 	e2fsck -fvy /dev/VolGroup00/LogVol00
> 
> To format (make sure to pick the correct one)
> 	mkfs.ext3 /dev/VolGroup00/LogVol00
> 
> mount as any other filesystem
> 	 mount /dev/VolGroup00/LogVol00 /mnt/mountpoint
> 
> Bottom line is you can use /dev/VolGroup00/LogVol00 as you
> would any hard drive device name such as /dev/hda1.
> 
> HTH,
> ~af
> 

The problems is he has multiple groups with the same name. This happens
as soon as you go with anaconda's defaults twice...

Michael


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