Detach a Volume
Complete these steps to detach a volume:
Log in to ZFSSA using the opc user account.
Navigate from the Configuration > SAN screen of the BUI.
Detach the volume (LUN).
Select the iSCSI tab and from the Initiators Group list, uncheck the box
next to the instance name.
The presence of the volume in the compute instance is cached, but the
ability to read or write data on the volume is removed. The volume will
disappear completely on the next reboot of the compute instance.