Peter Wang a6c22238e1 Unity: Use thin clone when cloning volume ...

Unity storage now supports cloning volume by taking its snapshot,
it's more efficient than previous implementation.

However, there is limitation on the count of thin clones inside one LUN
family sharing the same base LUN. Every time the limitation reaches, a
new volume will be cloned using `dd` copy. Then thin clone will be taken
from the new dd-copied volume.

DocImpact
Implements: blueprint unity-fast-clone

Change-Id: I5e4264ce9917e831e3efe27dc332641c9f94c07f

2017-06-28 13:16:22 +08:00

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