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Unable to create LVM mirrors with the error: "Insufficient suitable allocatable extents". How to fix it?

Solution Verified - Updated 2014-04-23T19:57:52+00:00 -

Issue

When creating mirrored logical volumes, the error message came out: "Insufficient free space" in spite of there being plenty of free space.
What is the reason? How to fix it?

Insufficient free space: XXX extents needed, but only 0 available
Unable to allocate extents for mirror(s).

Or

Insufficient suitable allocatable extents for logical volume : XX more required
Unable to allocate extents for mirror(s).

Environment

Red Hat Enterprise Linux 4,5,6
Logical Volume Manager 2 (LVM2)

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