The OceanStor Pacific logical software architecture states that the index layer provides fine-grained space-layout management capabilities and that the index module “maps the data objects in the DROS or block module to the lower-layer Plog space.” The training materials separately define the surrounding block-service components. VBS provides standard iSCSI/SCSI access. EDS provides structured services and value-added features, while OSD provides data-persistence capabilities. OceanStor Pacific block storage also uses a multi-MDC design to enhance reliability. The MDC is therefore the metadata-control component associated with maintaining the logical metadata relationship between block data and its allocated storage space. VBS is the access layer and does not own the metadata mapping function; OSD persists the actual data; EDS provides the broader structured-data service. Maintaining space metadata and the data-to-space index relationship belongs to the Metadata Controller function.

Study Guide Topics: Scale-Out Storage Technology Presentation → OceanStor Pacific → Logical Software Architecture → Block Service → Index Layer → MDC/VBS/EDS/OSD.

Huawei defines HyperCDP as a continuous-protection mechanism and states that it provides more intensive and persistent protection than conventional writable snapshots while imposing little impact on source LUN performance.

For block protection, a protection group provides the logical collection of source LUNs that must be protected consistently. A HyperCDP consistency group is then created for that protection group so that the member LUNs can receive a coordinated set of CDP protection points. Therefore, the protection group must already exist before the corresponding HyperCDP CG is created, making B correct.

A protection plan or schedule controls the policy and timing of protection-point generation; it is not the prerequisite object that defines which LUNs belong to the HyperCDP consistency relationship. This distinction is important: membership is established by the protection group, while execution timing is governed by scheduling/policy settings.

Huawei ' s data-protection model consistently separates protected objects/groups from the policies subsequently applied to those groups.

Study Guide Topics: Flash Storage Technology Presentation → HyperCDP → Block Continuous Data Protection → Protection Groups → HyperCDP Consistency Groups.

The Huawei flash-storage feature table defines SmartThin as “Intelligent thin provisioning.” Therefore, when the provisioning type is configured for thin provisioning, the associated feature is SmartThin.

The DME Storage course separately states that block-storage service levels support resource-tuning policies for Thin/Thick mode, deduplication and compression, and SmartTier. These are separate resource-tuning dimensions.

SmartTier concerns data placement among storage tiers, SmartCompression performs data reduction by compression, and SmartDedupe eliminates duplicate data. None of those features defines whether a LUN is thinly or thickly provisioned. SmartThin is specifically the capacity-allocation technology that exposes a logical capacity while allocating physical storage according to actual consumption.

Thus, among the four choices, SmartThin is the license/feature corresponding to the requested provisioning type.

The retrieved course material clearly maps SmartThin to intelligent thin provisioning and DME to Thin/Thick resource tuning; the exact licensing dialog wording is not separately reproduced in the parsed Training/Lab pages.

Study Guide Topics: Data Storage Management and O & M → DME Storage → Block Storage Service Level → Resource Tuning → Thin Provisioning → SmartThin.

Huawei states that after a remote replication pair is configured, “the secondary LUN is read-only by default.” If the primary LUN fails, the administrator can cancel write protection and make the secondary LUN writable so that the secondary storage system takes over host services.

Therefore, the statement is TRUE.

The default read-only behavior protects the DR copy from independent host modifications while normal replication is maintained. In a disaster situation, however, the secondary storage may need to become the active service provider. Removing secondary-LUN write protection enables DR-side hosts to perform both reads and writes against the protected copy.

Huawei specifically identifies this function as useful when a conventional primary/secondary switchover cannot be executed normally after failure of the production array. Once the secondary LUN has accepted new production writes, those changes are tracked so that subsequent incremental synchronization can support recovery and switchback.

This design shortens recovery time while preserving the normal protection model: read-only during ordinary replication, manually writable when DR takeover is required.

Study Guide Topics: Data Protection Solution → HyperReplication → Secondary LUN Write Protection → DR Takeover → Failover and Switchback.

The only true statement is C, so the false statements are A, B, and D.

Huawei states: “If communication between the storage systems is down, the preferred site continues to provide services while the other site stops providing services.”

The HyperMetro pair therefore transitions to To be synchronized because the two storage systems can no longer maintain synchronous dual-write consistency across the failed inter-site link.

Option A is false because automatic fallback to static priority mode is associated with quorum-server failure, not merely failure of the HyperMetro communication link while the quorum server remains available. Option D is false because permitting both sites to continue independently would create a split-brain risk. Quorum arbitration exists specifically to prevent that condition.

Option B is also false because arbitration does not simply make both sides unavailable. One site wins arbitration and continues providing services, while the losing site stops host access.

This behavior preserves data consistency until the inter-site link is repaired and synchronization resumes.

Study Guide Topics: Data Protection Solution → HyperMetro → Single Quorum Server → Arbitration Mechanism → Link Failure → To-be-Synchronized State.

The correct default chunk size for the stated 3.84 TB SSD configuration is 8 KB.

The Training Materials describe RAID 2.0+ global pooling as follows: “The system uses RAID 2.0+ to create a global storage pool… All SSDs evenly contribute LUN spaces for back-end SSD sharing.” This explains why storage space is divided into fine-grained units rather than assigning an entire LUN to a fixed RAID group or individual SSD.

Huawei ' s ROW architecture then organizes these units into chunk groups (CKGs). Instead of traditional overwrite behavior, new data and parity are written into a new chunk group and the LBA mapping is redirected to it.

For 3.84 TB SSDs in the configuration tested here, the corresponding default fine-grained chunk size is 8 KB. Options measured in megabytes represent a much coarser allocation unit and do not match this RAID 2.0+ chunk configuration.

Study Guide Topics: Data Storage Technology Presentation → OceanStor Dorado → RAID 2.0+ → Global Storage Pool → Chunk/CKG → ROW Architecture.

Huawei states that database backup “supports full backup, incremental backup, differential backup, and log backup.” It further specifies: “By using log backup, production data can be recovered to any time point in the past,” and that the solution supports “data encryption, backup data transmission encryption, and storage encryption” as well as “traffic control.”

Therefore, A, C, and D are correct.

Point-in-time recovery is enabled by combining database backup copies with transaction/archive log backup. Instead of being restricted to a full or incremental backup timestamp, the restore workflow can replay the required logs until the requested recovery time, thereby reducing the effective RPO.

Encryption is supported across multiple stages: backup data itself can be encrypted, backup-data transmission can be protected, and the underlying storage can use encryption. Traffic control is also supported so that backup activity does not consume excessive network or storage bandwidth and interfere with production services.

Data cleaning, option B, is not listed among the database backup capabilities described in this course section.

Study Guide Topics: Data Protection Solution → OceanProtect Database Backup → Log Backup → Point-in-Time Recovery → Encryption → Traffic Control.

The correct selections are IPMI, RESTful, and Redfish.

Huawei describes DME as “the unified management software integrating software and hardware for data centers” and states that it controls, manages, and analyzes VMs, datastores, databases, servers, switches, and storage devices.

For API-oriented integration, RESTful is explicitly part of Huawei ' s DME architecture. The storage-management course states that the open southbound system manages storage, switch, and host resources through management protocols including RESTful.

IPMI and Redfish provide the hardware-management interfaces required when the management platform interacts with server/BMC infrastructure. Redfish supplies a modern REST-oriented hardware-management model, while IPMI provides established out-of-band platform-management functions.

Telnet is not selected. It is a legacy plaintext terminal protocol and is not an appropriate protocol for the hardware/API interconnection functions being tested in this DME management architecture.

Study Guide Topics: Data Storage Management and O & M → DME/eDME → Unified Data Center Management → Southbound Interconnection → Server Hardware Management.