Remove a volume from a host,
Delete the LUN where it resides, and
Because the LUN identity may be unknown, map the Windows volume to the storage LUN.
Example
script
PS C:\Users\administrator.BROOKSDOM>
import-module esipstoolkit
PS C:\Users\administrator.BROOKSDOM> $system = Get-EmcHostSystem NEC-BLADE6
PS C:\Users\administrator.BROOKSDOM> $vol = Get-EmcHostVolume -HostSystem $system -ID TestVolume
Host: NEC-BLADE6. Refreshing MultiPath software information.
Host: NEC-BLADE6. Retrieving disk information from Virtual Disk Service.
PS C:\Users\administrator.BROOKSDOM> $hdisk = Get-EmcHostDisk -Volume $vol
PS C:\Users\administrator.BROOKSDOM> $lun = Get-EmcLUN -HostDisk $hdisk
Associating the specified host disk with its corresponding storage system...
PS C:\Users\administrator.BROOKSDOM> Remove-EmcVolumeMountPoint -HostSystem $system -Volume $vol
TaskStatus: Started
10% : Unmounting the volume...
100% : The specified volume has been unmounted...
TaskStatus: Completed
PS C:\Users\administrator.BROOKSDOM> Set-EmcHostDiskOnlineState -HostDisk $hdisk -Offline
TaskStatus: Started
10% : Bringing the disk offline...
100% : The specified disk has been brought offline...
TaskStatus: Completed
PS C:\Users\administrator.BROOKSDOM> Set-EmcLunAccess -HostSystem $system -Lun $lun -Unavailable
TaskStatus: Started
10% : Masking the LUN from the initiators...
100% : The specified LUN has been masked from the specified initiators...
TaskStatus: Completed
PS C:\Users\administrator.BROOKSDOM> Update-EmcSystem -HostSystem $system
Refreshing disks of host system '[Name: NEC-BLADE6, IP address: 172.20.1.106.]'
Host: NEC-BLADE6. Refreshing MultiPath software information.
Host: NEC-BLADE6. Retrieving disk information from Virtual Disk Service.
PS C:\Users\administrator.BROOKSDOM> Remove-EmcLun -Lun $lun
Confirm
Are you sure you want to perform this action?
Performing operation "Remove-EmcLun" on Target "LUN 44".
[Y] Yes [A] Yes to All [N] No [L] No to All [S] Suspend [?] Help (default is "Y"): y
TaskStatus: Started
10% : Destroying the LUN...
100% : The specified LUN has been destroyed...PS C:\Users\administrator.BROOKSDOM>
TaskStatus: Completed