Description of problem: In the (fairly common case) of having two drives with identical VG and LV names (e.g. when someone puts an old drive into a machine to get the data off it), ideally you'd like to be able to rename the VG of the one of the drives. Problem is, you can't really tell which drive the system booted off. In one case, a client had both /dev/sda2 and /dev/sdb2 as PVs belonging to VolGroup00 and LogVol00. Note that sda2 belonged to the actually booted system and sdb2 belonged to the "secondary" drive. In this case, an "lvdisplay -v --maps" shows the active extents as being on /dev/sdb2 when, in reality, they are on /dev/sda2. Version-Release number of selected component (if applicable): [root@prophead ~]# lvdisplay --version LVM version: 2.02.39 (2008-06-27) Library version: 1.02.27 (2008-06-25) Driver version: 4.14.0 How reproducible: Consistently Steps to Reproduce: 1. 2. 3. Actual results: Segments are displayed as being on the wrong PV Expected results: Segments should be displayed on the correct PV Additional info: The primary reason for reporting this bug is to permit one to modify an LVM layout. The tools should be aware of the fact that, even though there are two VolGroup00s on this system, they do NOT have the same UUID and should be either flagged as duplicates or given some special notation (e.g. "VolGroup00-1"). It would also be of great use to be able to specify the entity you're modifying by UUID as well as the name (e.g. in "vgreduce", be able to refer to the VG you're trying to modify by name or UUID, to cover cases where there are two drives with duplicate VG names). As the tools stand now, it is dangerous to try to change the VG of an unused PV simply because you don't know if the PV is in use or not.
Could you please check once again that the PV reported is really confused? E.g. try to check the "PV UUID" and "PV name" field in the output of "pvdisplay" command before and after attaching the second drive. It's possible that the drive nodes in /dev directory were reordered, but the PV name is not important in this case (it's just a hint), the PV UUID is the information that is taken into account. Thanks.
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Also, vgrename does accept the VG UUID so you can rename one of the VGs to something unique.