Unmapping a volume from one or more hosts
When volumes or ESXi hosts are no longer needed, or if new ones are to replace the current ones, you can unmap volumes from the hosts.
About this task
Important: A volume (LUN) must remain
mapped to at least one host. Otherwise, you cannot view the volume
or perform any actions on it from vSphere Web Client.
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Procedure
- In vSphere Web Client, navigate to and then click the row
of the volume that you want to unmap, and then choose the Unmap option by right-clicking the volume row or using
the Actions menu.
Figure 1. Unmap volume 
The Unmap Volume dialog box is displayed.