How to mount an LVM volume? (was lvm2 problem)
Alasdair G Kergon
agk at redhat.com
Tue Sep 23 13:31:28 UTC 2008
On Tue, Sep 23, 2008 at 12:35:21AM -0400, Eric wrote:
> At 08:40 PM 9/22/2008, Paul W. Frields wrote:
> >>>>>
> >The LVM system uses UUIDs (which are almost guaranteed to be unique) to
> >label each LVM PV, VG, and LV. I believe you can use "vgscan" to
> >display them, and then reference the UUID of the VG in question when you
> >run "vgrename" to rename it to something *not* "VolGroup00".
> <<<<<
> Thanks but it doesn't work.
> Evidently vgrename will not allow me to rename a mounted volume; it
> says "Volume group "VolGroup00" still has active LVs".
As per man page you use the uuid on the vgrename command line to rename
the *inactive* VG.
+ "vgrename Zvlifi-Ep3t-e0Ng-U42h-o0ye-KHu1-nl7Ns4 VolGroup00_tmp" changes
+ the name of the Volume Group with UUID
+ Zvlifi-Ep3t-e0Ng-U42h-o0ye-KHu1-nl7Ns4 to "Vol- Group00_tmp".
+
+ All the Volume Groups visible to a system need to have different names.
+ Otherwise many LVM2 commands will refuse to run or give warning
+ messages.
+
+ This situation could arise when disks are moved between machines. If a
+ disk is connected and it contains a Volume Group with the same name as
+ the Volume Group containing your root filesystem the machine might not
+ even boot correctly. However, the two Volume Groups should have
+ different UUIDs (unless the disk was cloned) so you can rename one of
+ the conflicting Volume Groups with vgrename.
Older version of Fedora don't have that option.
For them you'll either need to use up-to-date packages from somewhere
(eg live CD) or else edit the filters in /etc/lvm/lvm.conf to hide one
of the devices temporarily while you do the vgrename, then reinstate it.
Alasdair
--
agk at redhat.com
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