The disk delete command deletes a LUN. The LUN must be connected (mapped to a Windows drive letter) for the command to succeed.
sdcli disk delete [-m MachineName] {-p LUNpath | -d MountPoint}
sdcli disk delete -p \\133.25.61.62\sd_vds_only\mktng.lun
The preceding example deletes the LUN mktng.lun from the sd_vds_only volume on the storage system identified by the IP address 133.25.61.62.