Converting fully allocated volumes

You can convert fully allocated volumes to thin-provisionedvolumes.

You can non-disruptively convert a fully allocated volume into a thin-provisionedvolume by following this procedure:

Select a single copy, fully allocated volume.
Add a thin-provisioned copy to the volume.
Use a small real capacity and the autoexpand feature.
You can also choose to have the system automatically remove the fully allocated copy after the thin-provisioned volume is synchronized or you can manually remove it.
Wait while the volume mirroring feature synchronizes the copies.
Remove the fully allocated copy from the thin-provisionedvolume.

Any grains of the fully allocated volume that contain all zeros do not cause any real capacity to be allocated on the thin-provisioned copy. Before you create the mirrored copy, you can fill the free capacity on the volume with a file that contains all zeros.