'Check if LU exists on appliance and shared.
:param zvol_name: Zvol name
:raises NexentaException: if Zvol not exist
:return: True if LU exists and shared, else False'

def _is_lu_shared(self, zvol_name):

    try:
        shared = (self.nms.scsidisk.lu_shared(zvol_name) > 0)
    except exception.NexentaException as exc:
        if ('does    not    exist    for    zvol' not in exc.args[0]):
            raise
        shared = False
    return shared
