4.5. Removing a disk from a logical volume

Procédure

1. View the used and free space of physical volumes when using the LV:

   # pvs -o+pv_used
     PV          VG    Fmt    Attr   PSize      PFree     Used
    /dev/vdb1 myvg  lvm2   a--    1020.00m    0         1020.00m
    /dev/vdb2 myvg  lvm2   a--    1020.00m    0         1020.00m
    /dev/vdb3 myvg  lvm2   a--    1020.00m   1008.00m   12.00m

2. Move the data to other physical volume:

   1. If there are enough free extents on the other physical volumes in the existing volume group, use the following command to move the data:

      # pvmove /dev/vdb3
        /dev/vdb3: Moved: 2.0%
       ...
        /dev/vdb3: Moved: 79.2%
       ...
        /dev/vdb3: Moved: 100.0%

   2. If there are no enough free extents on the other physical volumes in the existing volume group, use the following commands to add a new physical volume, extend the volume group using the newly created physical volume, and move the data to this physical volume:

      # pvcreate /dev/vdb4
        Physical volume "/dev/vdb4" successfully created
      
      # vgextend myvg /dev/vdb4
        Volume group "myvg" successfully extended
      
      # pvmove /dev/vdb3 /dev/vdb4
        /dev/vdb3: Moved: 33.33%
        /dev/vdb3: Moved: 100.00%

3. Remove the physical volume:

   # vgreduce myvg /dev/vdb3
   Removed "/dev/vdb3" from volume group "myvg"

   If a logical volume contains a physical volume that fails, you cannot use that logical volume. To remove missing physical volumes from a volume group, you can use the --removemissing parameter of the vgreduce command, if there are no logical volumes that are allocated on the missing physical volumes:

   # vgreduce --removemissing myvg