Fedora and LVM

Fedora and LVM

Posted Nov 2, 2012 13:07 UTC (Fri) by Tobu (subscriber, #24111)
In reply to: Fedora and LVM by dlang
Parent article: Fedora and LVM

I've just tried it (using a VM to create a colliding VG name, then kpartx -a to make the nested partitions show up).

$ sudo pvscan
WARNING: Duplicate VG name V2: Existing 5daecde1-e30c-4ef8-bcf6-e501382f67b7 (created here) takes precedence over 8b814833-1a37-47d4-896d-5a8aa74f458f
  PV /dev/mapper/sda2p1   VG V2     lvm2 [1016,00 MiB / 0    free]
  PV /dev/sda5            VG V2     lvm2 [1,82 TiB / 13,00 GiB free]

$ sudo vgrename 8b814833-1a37-47d4-896d-5a8aa74f458f V3
  Volume group "V2" successfully renamed to "V3"

Accessing the partition was very easy, but then I had to edit the root= boot parameter to boot the VM (vgcfgrestore to undo the rename would also work). This could be improved by having root= be uuid-based (which Debian/Ubuntu don't do for LVM, don't know about Fedora), as well as by having the Fedora installer pick a more unique VG name.

Debian and Ubuntu pick the hostname as the VG name, this seems like a good way to prevent these collisions entirely.

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