Why am I seeing a capacity over-allocation error when I have enough free capacity in a volume group to create volumes?
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The selected volume group might have one or more free capacity areas. A free capacity area is the free capacity that can result from deleting a volume or from not using all available free capacity during volume creation.
When you create a volume in a volume group that has one or more free capacity areas, the volume's capacity is limited to the largest free capacity area in that volume group. For example, if a volume group has a total of 15 GiB free capacity, and the largest free capacity area is 10 GiB, the largest volume you can create is 10 GiB.
If a volume group has free capacity areas, the volume group graph contains a link indicating the number of existing free capacity areas. Select the link to display a pop-over that indicates the capacity of each area.
By consolidating free capacity, you can create additional volumes from the maximum amount of free capacity in a volume group. You can consolidate the existing free capacity on a selected volume group using one of the following methods:
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When at least one free capacity area is detected for a volume group, the "Consolidate free capacity" recommendation appears on the Home page in the Notification area. Click the Consolidate free capacity link to launch the dialog box.
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You can also select to launch the dialog box.
If you want to use a specific free capacity area rather than the largest free capacity area, use the Command Line Interface (CLI).