The statement that is incorrect is D. Huawei's RAID 2.0+ technology defines a hard disk domain as a collection of disks of the same type (e.g., all SSDs, all SAS, or all NL-SAS). However, a key feature of RAID 2.0+ is its flexibility in handling heterogeneity within that type. It allows for disks of different capacities and rotational speeds to coexist within the same domain. The technology virtualizes the physical disks by dividing them into fixed-size blocks called Chunks. These Chunks are then used to form Chunk Groups (CKGs), which are the basis for LUNs. This virtualization layer abstracts the physical differences, meaning the size and speed of the hard disks do not have to be consistent.

A. This is the correct definition. A hard disk domain is a logical grouping of physical disks used for resource pooling and management in Huawei storage systems.

B. This is a fundamental principle of storage resource management. A physical disk is an indivisible resource that can only belong to one management domain to ensure data integrity.

C. This is a standard feature. OceanStor V3 systems allow administrators to create multiple disk domains to segregate different disk types (for tiering) or for other management purposes.

1. Huawei OceanStor V3 Series V300R006 Storage System Basic Storage Service Guide for Block

Section 4.2.1 "Disk Domain". The document states

"A disk domain can contain disks of the same type but different capacities and rotational speeds." This directly contradicts option D.

2. Huawei OceanStor RAID 2.0+ Technology White Paper

Section 2.2 "Core Concepts". The paper explains that RAID 2.0+ divides member disks in a disk domain into fixed-size Chunks. It further clarifies

"Disks in a disk domain must be of the same type (such as SAS or NL-SAS) but can be of different capacities." This confirms that capacity and speed do not need to be identical.

3. Huawei OceanStor Dorado V3 Series V300R001 Product Documentation

Section "RAID 2.0+". The documentation describes the architecture: "RAID 2.0+ divides disks in a disk domain into small-granularity data blocks (Chunk

CK) and organizes CKs into Chunk Groups (CKG) based on the RAID policy." This underlying mechanism is what enables the use of disks with varying sizes.