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Date: Fri, 17 Dec 2010 12:27:13 -0500
From: Mauricio Tavares <raubvogel@gmail.com>
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Subject: [linux-lvm] Conflicting vg names but can't rename one
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To: LVM general discussion and development <linux-lvm@redhat.com>

	I took a drive from an ailing machine to suck the data out of it. This 
drive used to be part of a single drive LVM. Now, when I connect it to 
my machine, I realized I had named that vg the same name I had used in 
the vg I have in my desktop associated with just one drive,

vgdisplay export
   WARNING: Duplicate VG name export: Existing 
fjM9qy-aCEM-iluj-yTdQ-CwT5-Iijk-uOYXlB (created here) takes precedence 
over SB3NfW-swQM-5rdw-xf5e-z6At-r5DM-dUwG7D
   --- Volume group ---
   VG Name               export
   System ID
   Format                lvm2
   Metadata Areas        1
   Metadata Sequence No  2
   VG Access             read/write
   VG Status             resizable
   MAX LV                0
   Cur LV                1
   Open LV               1
   Max PV                0
   Cur PV                1
   Act PV                1
   VG Size               465.76 GiB
   PE Size               4.00 MiB
   Total PE              119234
   Alloc PE / Size       102400 / 400.00 GiB
   Free  PE / Size       16834 / 65.76 GiB
   VG UUID               fjM9qy-aCEM-iluj-yTdQ-CwT5-Iijk-uOYXlB

We see that  UUID fjM9qy-aCEM-iluj-yTdQ-CwT5-Iijk-uOYXlB is the drive/vg 
in use while UUID SB3NfW-swQM-5rdw-xf5e-z6At-r5DM-dUwG7D is the extra 
drive I just attached to my machine. So I thought on using vgrename to 
change the name of the extra drive's vg so I can mount it:

vgrename SB3NfW-swQM-5rdw-xf5e-z6At-r5DM-dUwG7D export1
   WARNING: Duplicate VG name export: Existing 
fjM9qy-aCEM-iluj-yTdQ-CwT5-Iijk-uOYXlB (created here) takes precedence 
over SB3NfW-swQM-5rdw-xf5e-z6At-r5DM-dUwG7D
   WARNING: Duplicate VG name export: Existing 
fjM9qy-aCEM-iluj-yTdQ-CwT5-Iijk-uOYXlB (created here) takes precedence 
over SB3NfW-swQM-5rdw-xf5e-z6At-r5DM-dUwG7D
   WARNING: Duplicate VG name export: 
fjM9qy-aCEM-iluj-yTdQ-CwT5-Iijk-uOYXlB (created here) takes precedence 
over SB3NfW-swQM-5rdw-xf5e-z6At-r5DM-dUwG7D
   Volume group "export" still has active LVs

What am I missing here? I thought if I told it to rename the vg with a 
given uuid I would be golden. As you can see, that is not the case.