Huawei OceanProtect provides a multi-layered defense to ensure that backup data remains immutable and protected from ransomware attacks. To specifically prevent data tampering and deletion, the following technologies are employed:
WORM (Write Once, Read Many) (Option C): This technology ensures that once data is written to the backup storage, it cannot be modified or deleted by any user (including administrators) until the specified retention period has expired.
Secure Snapshot (Option A): These snapshots are protected by a "read-only" attribute and a retention lock. Unlike standard snapshots, secure snapshots cannot be deleted manually before they expire, providing a reliable point-in-time recovery source even if the primary backup is targeted.
Air Gap (Option B): By physically or logically isolating a copy of the data in an "Air Gap" zone that is disconnected from the network most of the time, Huawei ensures that the data is unreachable for tampering or deletion by attackers who have gained access to the production network.
Detection and analysis (Option D) is part of the solution, but its purpose is to identify an ongoing attack or infected files, rather than physically preventing the tampering or deletion of the data itself.

This statement is false because RAID 0 and Mirroring (RAID 1) are fundamentally different concepts in Huawei storage technology. As defined in the Huawei technical manual, RAID 0 is "Striping." It breaks data into chunks and spreads them across multiple disks to increase performance. It has no redundancy.
"Mirroring" is the terminology specifically used for RAID 1. In a RAID 1 configuration, the system writes the exact same data to two separate physical disks simultaneously. This creates a 100% redundant copy (a mirror). If one disk fails, the other continues to provide data, ensuring zero downtime and no data loss. Huawei's RAID 2.0+ virtualization technology can implement striping and mirroring across different "chunks" or "extents" within a storage pool, but it maintains the technical distinction: RAID 0 is for performance through striping, while mirroring is for reliability through duplication. Therefore, characterizing RAID 0 as a mirroring technology is a technical inaccuracy.

In Huawei OceanStor Hybrid Flash systems, performance optimization is achieved through intelligent resource management. Level-2 cache (Option A), known as SmartCache, utilizes SSDs as an extension of the system's DRAM cache. By storing "hot" data on high-speed SSDs, the system significantly reduces the read latency for frequently accessed blocks that have been evicted from the primary memory cache.
Storage tiering (Option D), or SmartTier, automatically migrates data blocks between different storage tiers (SSD, SAS, and NL-SAS) based on their access frequency. It ensures that active data resides on the highest-performance media while moving inactive "cold" data to high-capacity drives. These two features are specifically designed to maximize IOPS and minimize response times. In contrast, Thin Provisioning (SmartThin) and Data Deduplication (SmartDedupe) are "Storage Efficiency" features; their primary goal is to save physical space and improve capacity utilization. While essential for TCO, they do not inherently improve raw system performance and may involve a minor metadata overhead during processing.

The high-end OceanStor Dorado 18000 series is designed with the SmartMatrix 4.0 full-mesh architecture, which provides the industry's highest level of controller redundancy. In a standard configuration with 8 controllers (housed in two enclosures), the system can tolerate extreme failure scenarios without service interruption:
Individual Failures (Option A, C): The system easily handles the failure of one or two controllers as the remaining controllers take over the workload transparently.
Extreme Controller Failure (Option B): Due to the full-mesh interconnect where all controllers share a global memory cache and can access all backend disks, the system can tolerate the failure of up to seven out of eight controllers. As long as one controller remains active, services continue.
Enclosure Failure (Option D): Because the architecture is mirrored across controller enclosures, the entire failure of one controller enclosure (containing 4 controllers) is tolerated.
This level of resilience ensures that mission-critical applications remain online even in the face of catastrophic hardware events, maintaining 99.9999% availability.

Huawei OceanProtect incorporates specialized algorithms to achieve industry-leading backup and recovery speeds. Source deduplication (Option A) is a primary performance driver because it filters out redundant data at the source, ensuring that only new data blocks are transmitted, which directly reduces the time required to complete a backup job.
Adaptive data locality rearrangement (Option D) is a unique feature that optimizes how data is written to and read from the physical disks within the OceanProtect array. During the backup process, the system calculates data dispersion in real-time and arranges data blocks on the disks to ensure they are stored sequentially. This is critical because it allows for high-speed sequential reads during data recovery, significantly improving the performance of HDDs which typically struggle with random I/O. While media deduplication (Option B) and secure snapshots (Option C) are essential for storage efficiency and security, they are not the primary features credited with the raw performance "leap" in backup and recovery speed.