3.6.0 Matrix Server 3.6.0 Administration Guide (5697-7081, December 2007)

Chapter 8: Configure Dynamic Volumes 92
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The mx dynvolume create, mx dynvolume extend, and mx fs create
commands include the --reuse option, which causes the operation to
proceed even though the specified subdevice may already be in use by
another dynamic volume. The operation will destroy the volume
previously using the subdevice.