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kdt
Asked: 2011-09-20 07:02:25 +0800 CST

LVM: regenerate a UUID?

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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?

lvm uuid

3 Answers

  1. pvchange --uuid /physical/volume/path
vgchange --uuid /volume/group/name
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  2. 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.

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  3. 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
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