Huawei Updated H13-629_V3.0 Exam Questions and Answers by taran

Interrupted abnormally → I/O error during the migration; Faulty → Failure in pair deletion, creation, or split; Paused → Forcible migration stopping by an administrator

The course states that “SmartMigration migrates services on a source LUN completely to a target LUN without interrupting host services.” It also explains that source-to-target synchronization uses dual-write and DCL technologies to maintain data consistency while services continue running.

The three states distinguish the cause of migration interruption. Interrupted abnormally corresponds to an I/O-related interruption occurring while migration is actually processing data. This differs from Faulty, which indicates that the SmartMigration relationship itself cannot successfully complete a control-plane operation such as pair creation, deletion, or splitting. Paused is an administrative state: migration is intentionally stopped rather than failing because of an underlying I/O or object-management error.

This distinction is consistent with SmartMigration ' s architecture. Data synchronization is a running data-plane process, while creation, splitting, and deletion are pair-management operations. An administrator-triggered stop does not imply that either of those mechanisms has failed.

The course also describes SmartMigration as Huawei ' s online LUN migration function.

Study Guide Topics: Data Migration Solution → SmartMigration → Migration Pair → Data Synchronization → Migration States and Exception Handling.

Huawei explains that a file-system snapshot is a point-in-time copy. When source data changes, ROW writes the new data to another location while the snapshot continues to reference the original data, thereby preserving the source file system ' s state at snapshot creation time.

The statement is TRUE. Snapshot rollback changes the active file-system data state back to the selected protection point. Active NAS clients must therefore not continue issuing file operations against the source file system while that authoritative state is being replaced. The host share is unmounted before rollback so that active client I/O cannot conflict with restoration of snapshot metadata and data mappings.

The HCIE materials also show the same operational consistency principle in rollback workflows: upper-layer service access is stopped before storage state is reverted. In the Lab Guide ' s rollback procedure, the first action is to stop upper-layer service access and unmount the relevant file system before storage mappings are changed.

This ensures that the post-rollback file system presents one internally consistent point-in-time image when service access resumes.

Study Guide Topics: Data Storage Technology Presentation → HyperSnap → File System Snapshot → ROW → Snapshot Rollback → NAS Data Consistency.

The required component is MDC.

OceanStor Pacific uses a distributed control architecture in which cluster-management and metadata/control services must remain highly available as nodes are added, removed, or experience failures. Huawei specifically identifies multi-MDC as a mechanism that improves system reliability. The training architecture also shows MDC participating in sub-health management together with storage-side processes such as OSD and EDS.

This distributed deployment is consistent with the architecture of OceanStor Pacific: storage services are spread across nodes, and control information must remain accessible regardless of the physical node role. The system therefore cannot depend on one isolated control instance.

Huawei also describes OceanStor Pacific as a three-layer scale-out architecture integrating block, file, object, and HDFS services, with cluster-status control, distributed data routing, redundancy management, rebuilding, and balancing forming core storage-engine functions. MDC supports the distributed coordination and control required by this architecture.

The supplied question set identifies MDC as the required abbreviation.

Study Guide Topics: Data Storage Technology Presentation → OceanStor Pacific → Scale-Out Architecture → MDC → Cluster Control → High Reliability.

Huawei describes source deduplication as occurring before backup data is transferred to storage media. Data or files are segmented, fingerprints are calculated, and those fingerprints are sent to the DPA fingerprint repository for duplicate checking.

If an identical fingerprint already exists, Huawei states that the duplicate data block is not saved; instead, the existing block is referenced. Only when no duplicate fingerprint exists is the actual new data block transmitted.

This mechanism supports C: when the data content is already present in the backup system, the backup workflow needs only the metadata/reference information required to point to the existing block rather than retransmitting the duplicate payload.

The principal benefits are reduced network traffic, reduced backup-storage consumption, and a shorter backup window. The feature is not described as a mechanism whose purpose is to improve application-server performance; deduplication processing itself consumes some processing resources. Nor does the course define general source deduplication as being independently enabled or disabled according to application type or backup type in the way described by A and D.

Study Guide Topics: Data Protection Solution → DPA → Source Deduplication → Fingerprints → Duplicate Block Detection → Transmission Reduction.