Quoting Paul <unix at bikesn4x4s.com>: > # lvresize -L +10G --test /dev/mapper/VolGroup00-LogVol00 /dev/hda2 > Test mode: Metadata will NOT be updated. > Volume group mapper doesn't exist Logical volume name should be specified as /dev/VolGroup00/LogVol00. Also, you might prefer to use pvdisplay, vgdisplay and lvdisplay. For example, it will print sizes in physical extents too (in case you want to use -l instead of -L option).