Linux tip, Fedora tip / howto: Mounting a logical volume from a volume group

 
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Mounting a logical volume from a volume group

I normally don't use logical volumes (just another layer between me and the disk..), but one day I had to mount one on a spare harddisk that I had hooked up to my main machine.

Some pointers:

  • lvdisplay shows you the available volume groups
  • if it only says "No volume groups found", run lvmdiskscan first
  • if the one you want to mount is labelled
    not available
    use:
    vgchange -ay VolGroup00
    (replace with the name of the group you want to use)
  • to mount:
    mount /dev/VolGroup00/LogVol00 /mnt/temp
    (again, replace with volume you want to mount, and put your desired mount point instead of /mnt/temp)

Another path to a successful mount, this time on Fedora 13. I had invalid entries in my /etc/fstab after having removed a second IDE harddisk, and had to boot from the Fedora 13 CD ROM to be able to edit it. Then (as root):

  • vgchange -ay
    which gave:
    3 logical volume(s) in volume group "vg_kryten" now active
    (obviously it most likely will show a different group name on your system)
  • ls -l /dev/vg_kryten
    which gave:
    lv_home → ../dm-3
    lv_root → ../dm-2
    lv_swap → ../dm-4
  • I wanted to mount the root partition, so:
    mount /dev/vg_kryten/lv_root ./temp
    (./temp a temporary mount point created with mkdir ./temp)


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