This read-create StorageType object specifies whether a traffic ACL profile entry is kept in volatile memory or persisted to non-volatile storage across a reboot. It matters to an administrator because a profile stored as volatile will silently disappear on the next device restart, undoing any ACL policy that depended on it. For example, an operator provisioning a permanent security ACL profile for a data center uplink would confirm this object reads nonVolatile rather than volatile before relying on it long term.