Huawei H13-624_V5.5 - HCIP-Storage V5.5

The HyperMetro feature in Huawei storage systems, such as OceanStor Dorado, provides active-active data access with arbitration mechanisms to handle site failures. The *HCIP-Storage V5.5 Training Material (Module 4: Storage Design and Implementation)* details HyperMetro arbitration modes:

- Option A: True. The material states: “In the absence of a quorum server, HyperMetro operates in static priority mode, where the preferred site is designated to win arbitration and continue services during a failure.”

- Option B: True. The material explains: “In static priority mode, if the preferred site fails, the non-preferred site does not automatically take over to avoid split-brain scenarios. Services stop, and manual intervention is required to forcibly start services on the non-preferred site.”

- Option C: False. The material clarifies: “In quorum server mode, the quorum server can be deployed on physical machines or virtual machines, provided it meets the performance and network requirements.” This makes the statement that it can only be deployed on physical machines incorrect.

- Option D: True. The material confirms: “In quorum server mode, if the link between storage systems fails, both systems send arbitration requests to the quorum server to determine which site continues providing services.”

Thus, option C is false.

The multi-tenant feature in Huawei’s flash storage systems, such as OceanStor Dorado, is designed to isolate resources for different tenants to ensure data security and privacy. The *HCIP-Storage V5.5 Training Material (Module 2: Flash Storage Technologies)* explains: “The multi-tenant feature isolates both block and file resources, ensuring that tenants cannot access each other’s LUNs or file systems. This is achieved through logical partitioning and access control mechanisms.” The statement in the question claims that tenants cannot access each other’s LUNs but can access each other’s file systems, which contradicts the official documentation. The material emphasizes that file systems, like LUNs, are isolated per tenant, and cross-tenant access is prevented unless explicitly configured (e.g., through shared namespaces, which is not the default behavior). Therefore, the statement is false.

This question addresses issues with enabling object services in Huawei OceanStor Pacific 9550 systems, as covered in the *HCIP-Storage V5.5 Training Material (Module 3: Scale-Out Storage Technologies)*. The material outlines prerequisites for enabling object services, including time synchronization. Let’s evaluate:

- Option A: Possible cause. The material states: “Manual time adjustments on cluster nodes can cause inconsistencies in conflict handling, preventing object services from being enabled.”

- Option B: Possible cause. The material notes: “Lack of NTP synchronization or use of different NTP sources can lead to time discrepancies, causing object service failures.”

- Option C: Not a cause. The material clarifies: “Namespaces with the same name under the same account are allowed in OceanStor Pacific, as they are managed uniquely per tenant or bucket.” This does not prevent object service enablement.

- Option D: Possible cause. The material confirms: “Inconsistent NTP clocks between the storage cluster and client can disrupt object service operations, as time synchronization is critical for protocols like S3.”

Thus, option C is not a possible cause.

The cache write policy for Huawei scale-out storage, like OceanStor Pacific, is critical for performance-sensitive applications like video surveillance. The *HCIP-Storage V5.5 Training Material (Module 4: Storage Design and Implementation)* states: “For video surveillance, which involves sequential large I/O writes, the write-back cache policy is recommended to maximize performance by buffering writes and reducing disk I/O latency. Write-through, which writes directly to disks, is less suitable due to higher latency.” The statement’s insistence on write-through for high-performance video surveillance is incorrect, as write-back is preferred, making the statement false.

The *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* addresses Oracle database troubleshooting: “To locate Oracle alert log files, commands like ‘show parameter background_dump_dest’ (SQL*Plus) and ‘CRS_HOME/bin/diagcollection.sh’ (Oracle Grid Infrastructure) can query or collect log paths. The ‘ioscan -funC disk’ command (HP-UX) lists disk devices, which may indirectly help identify storage paths.” However, “db2support outpath -d db_name -c” is specific to IBM DB2 databases, not Oracle, making it irrelevant for querying Oracle alert log paths. Thus, option D cannot be used.