Quoting Paul <unix@xxxxxxxxxxxxxx>:
# 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).
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