12.6. Rounding errors in LVM output
LVM commands that report the space usage in volume groups round the reported number to 2 decimal places to provide human-readable output. This includes the vgdisplay and vgs utilities.
As a result of the rounding, the reported value of free space might be larger than what the physical extents on the volume group provide. If you attempt to create a logical volume the size of the reported free space, you might get the following error:
Insufficient free extents
To work around the error, you must examine the number of free physical extents on the volume group, which is the accurate value of free space. You can then use the number of extents to create the logical volume successfully.
