LVM: regenerate a UUID?

Question

I have some virtual machines which were clones of the same original disk image, which contained some LVM volumes. When I clone these, I end up with multiple LVM volumes (albeit on different hosts) which have the same 'unique' ID. Is there any way I can get LVM to change the UUID of an existing volume?

score 10 · Answer 1 · answered Sep 19 '11 at 15:23

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pvchange --uuid /physical/volume/path
vgchange --uuid /volume/group/name

answered Sep 19 '11 at 15:23

quanta

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you can't vgchange --uuid on a vg with active logical volumes. – Ben Lutgens Aug 02 '16 at 15:00
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`vgimportclone /physical/volume/path` helped me, at least a bit. – Ned64 May 21 '17 at 18:19
@Ned64 this should be the accepted answer ! works for me. – LiMar Mar 11 '20 at 15:34
@LiMar OK, thanks for the feedback, I wrote an answer. Feel free to vote for it :-) – Ned64 Mar 11 '20 at 16:57

score 6 · Answer 2 · answered Mar 11 '20 at 16:56

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According to its man page, the command vgimportclone will do the work for you:

vgimportclone /physical/volume/path

This is used for importing a volume group (VG) from a cloned physical volume (PV), e.g. after a snapshot or other duplicated PV.

answered Mar 11 '20 at 16:56

Ned64

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score 1 · Answer 3 · answered Nov 15 '19 at 23:35

pvchange was not working for me, it kept avoiding the volume with

WARNING: Not using device /dev/sdc for PV C0s0Wg-HcnQ-LOP3-QwmR-dhSX-4wW1-hRhxm3. WARNING: PV C0s0Wg-HcnQ-LOP3-QwmR-dhSX-4wW1-hRhxm3 prefers device /dev/sdb because device is used by LV. Device /dev/sdc excluded by a filter.

Ultimately, wipefs /dev/sdc was the solution, after which I simply used

pvcreate /dev/sdc

LVM: regenerate a UUID?

3 Answers3