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6.7. Insufficient Free Extents for a Logical Volume
You may get the error message "Insufficient free extents" when creating a logical volume when you think you have enough extents based on the output of the
vgscommands. This is because these commands round figures to 2 decimal places to provide human-readable output. To specify exact size, use free physical extent count instead of a multiple of bytes to determine the size of the logical volume.
vgdisplaycommand, by default, includes this line of output that indicates the free physical extents.
vgdisplay--- Volume group --- ... Free PE / Size 8780 / 34.30 GB
Alternately, you can use the
vg_extent_countarguments of the
vgscommand to display the free extents and the total number of extents.
vgs -o +vg_free_count,vg_extent_countVG #PV #LV #SN Attr VSize VFree Free #Ext testvg 2 0 0 wz--n- 34.30G 34.30G 8780 8780
With 8780 free physical extents, you can enter the following command, using the lower-case l argument to use extents instead of bytes:
lvcreate -l 8780 -n testlv testvg
This uses all the free extents in the volume group.
vgs -o +vg_free_count,vg_extent_countVG #PV #LV #SN Attr VSize VFree Free #Ext testvg 2 1 0 wz--n- 34.30G 0 0 8780
Alternately, you can extend the logical volume to use a percentage of the remaining free space in the volume group by using the
-largument of the
lvcreatecommand. For information, see Section 4.4.1, “Creating Linear Logical Volumes”.