Description 1: There is an interconnection line between the controllers of the storage system. If the controller is broken, it belongs to it. The working controller of the managed LUN will be switched to a working controller. Description 2: The working controller and home controller of a LUN must be unified into one controller.

Description 1 is correct. Huawei storage systems utilize a dual-controller, active-active architecture. The controllers are linked by a high-speed interconnect (like PCIe) for cache mirroring and state synchronization. This design provides high availability. If a controller fails, the system automatically and non-disruptively transfers control of its LUNs to the surviving peer controller, which then handles all I/O operations. This process is known as a controller failover. Description 2 is incorrect. While it is best practice for a LUN's working controller (the one currently processing I/O) and its home controller (the default or preferred owner) to be the same for optimal performance, it is not a mandatory state. During a failover, the working controller will differ from the home controller. The system is designed to function in this "trespassed" state until the original controller is restored and a failback operation is performed.

A. Description 2 is incorrect. The system is designed to operate when the working and home controllers are different, such as during a failover.
B. Description 1 is correct as it accurately describes the fundamental controller failover mechanism. Description 2 is incorrect.
C. Description 1 is correct. It is the core principle of high availability in Huawei's dual-controller storage architecture.

1. Huawei HCIA-Storage V5.0 Training Material.

Reference for Description 1: Chapter 2

"Storage System Architecture and RAID Technology

" Section 2.1.2 "Hardware Architecture of a Storage System." This section details the dual-controller architecture

stating

"If one controller is faulty

the other controller can take over its services to ensure service continuity."

Reference for Description 2: Chapter 4

"Advanced Storage Technologies

" Section 4.1.1 "Multipathing." This section explains LUN ownership

defining the owning (home) controller and working controller. It clarifies that in a failover scenario

the working controller changes to the peer controller

demonstrating they are not always unified.

2. Huawei OceanStor Dorado 8000 and 18000 V6 Product Documentation.

Reference for Description 1 & 2: Document section "Reliability

" subsection "Component Failure Protection." The documentation states: "Controller failure: OceanStor Dorado V6 storage systems use a dual-controller architecture. If one controller fails

the other controller takes over its services." It further explains the failover and failback process

which inherently involves the working controller temporarily differing from the home controller.