Under some circumstances, encapsulation of a disk can fail because there is not enough free space available on the disk to accommodate the private region. If there is insufficient free space , the encapsulation process ends abruptly with an error message similar to the following:

VxVM ERROR V-5-2-338 The encapsulation operation failed with the
following error:
It is not possible to encapsulate device, for the following
reason:
<VxVM vxslicer ERROR V-5-1-1108 Unsupported disk layout.>

One solution is to configure the disk with the nopriv format.