H13-624_V5.5 HCIP-Storage V5.5 Questions and Answers

Cache watermarks in Huawei flash storage systems manage dirty data flushing. The *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* explains:

- Option A: True. “The low watermark for dirty data should be around 20% to ensure sufficient buffer space.”

- Option B: True. “The high watermark should not be too high, and the gap between high and low watermarks should be sufficient to avoid frequent flushing.”

- Option C: True. “A high watermark that is too high causes I/O fluctuations and increased latency during traffic bursts.”

- Option D: False. “High watermarks affect write performance by delaying flushes, but low watermarks do not directly impact read performance, which depends on prefetch and cache hit ratios.”

Thus, option D is false.

The deployment of Huawei OceanStor Pacific series involves hardware and software setup. The *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* explains:

- Option A: False. The material states: “Network initialization for nodes during software deployment can be performed via DeviceManager, the CLI, or the Storage Deployment Tool (SDT), but DeviceManager is not mandatory.” This makes the statement incorrect.

- Option B: True. “SmartKit supports batch OS installation for hardware deployment.”

- Option C: True. “SmartKit can configure clusters, including disabling LLDP and enabling BMC mobile customization.”

- Option D: True. “SmartKit is used to configure BMC settings and verify firmware, OS, and driver versions.”

Thus, option A is false.

Fibre Channel (FC) link exceptions in Huawei OceanStor Dorado 18000 systems are addressed in the *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)*: “Common causes of FC link exceptions include mismatched port rates between the host and switch, poorly connected or faulty optical fibers, and mismatched optical module rates between host and storage front-end ports.” Let’s evaluate:

- Option A: Correct. Mismatched FC port rates between the host and switch cause link failures.

- Option B: Correct. Faulty or loose optical fibers disrupt FC connectivity.

- Option C: Correct. Mismatched optical module rates between host and storage ports lead to link exceptions.

- Option D: Incorrect. IP address settings are relevant to iSCSI, not FC, which uses physical connections.

Thus, options A, B, and C are possible causes.

Storage performance metrics are covered in the *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)*: “For large I/O sizes (≥64 KB), throughput is the primary performance indicator, as it measures the data transfer rate, critical for applications like video streaming or large file transfers.” Throughput, measured in MB/s or GB/s, reflects the system’s ability to handle large data volumes, making it the key concern for such scenarios.

The *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* addresses host-side performance issues: “Outdated HBA drivers or insufficient concurrent HBAs can cause high host latency. Upgrading the HBA driver to the latest version ensures compatibility and performance. Adjusting the multipathing software’s load balancing algorithm to min-task optimizes I/O distribution across paths, reducing latency.” Let’s evaluate:

- Option A: Incorrect. HBA vendor software may query settings, but modifying concurrent HBAs is typically a firmware or driver-level task, not a standard management software function.

- Option B: Correct. Upgrading the HBA driver resolves compatibility and performance issues.

- Option C: Correct. The min-task algorithm balances I/O to minimize queuing delays.

- Option D: Incorrect. Cache prefetch policies affect storage-side performance, not host-side latency caused by HBA issues.

Thus, options B and C are the correct measures.

The statement describes the reliability mechanism of Huawei’s scale-out storage systems, such as the OceanStor Pacific series, which employ cabinet-level security to enhance data availability. According to the *HCIP-Storage V5.5 Training Material (Module 3: Scale-Out Storage Technologies)*, scale-out storage systems use distributed architectures with N data blocks and M parity blocks stored across different cabinets to ensure redundancy. This design leverages erasure coding (EC) or similar mechanisms to tolerate faults. The material explicitly states: “In a scale-out storage system, N+M redundancy ensures that if up to M nodes or M disks fail, the system can reconstruct data without interruption or loss. However, if M cabinets fail, the system may lose the ability to access sufficient parity or data blocks, potentially interrupting services.” This confirms that the system can handle M node or disk failures without issue, but M cabinet failures may disrupt services due to the loss of distributed data or parity blocks. Therefore, the statement is true.

The question addresses the configuration process for storage pools in Huawei OceanStor Dorado 18000 series systems. The *HCIP-Storage V5.5 Training Material (Module 4: Storage Design and Implementation)* clarifies: “To create storage pools, an engineer configures the physical disks or disk domains, which serve as the foundation for storage resources. LUNs and LUN groups are created after the storage pool is established, as LUNs are logical divisions of the pool’s capacity. Mapping LUN groups to host groups is a subsequent step to enable host access.” The statement in the question incorrectly suggests that LUNs, LUN groups, and mappings must be configured before creating storage pools, which reverses the actual process. Storage pools are a prerequisite for LUN creation, not the other way around, making the statement false.

The HyperSnap feature in Huawei flash storage systems, such as OceanStor Dorado, enables point-in-time snapshots for data protection. The *HCIP-Storage V5.5 Training Material (Module 2: Flash Storage Technologies)* states: “To create snapshots using HyperSnap, the storage pool containing the source LUNs must have sufficient available capacity to store snapshot metadata and copy-on-write (COW) data. If the storage pool lacks free space, snapshot creation for a protection group will fail.” This aligns with the question’s statement that a lack of available capacity in the storage pool prevents snapshot creation for a protection group, making the statement true. The material emphasizes that capacity issues are a common cause of snapshot failures, as snapshots require additional space for incremental changes.

The Distributed Parallel Client (DPC) in Huawei OceanStor Pacific systems enables parallel file access. The *HCIP-Storage V5.5 Training Material (Module 3: Scale-Out Storage Technologies)* explains: “When adding DPC nodes, engineers can manually add nodes using DeviceManager by entering the management IP address of the node, not the service IP address. The management IP is used to establish control plane communication for node integration.” The service IP address is used for data access by clients, not for node creation or management tasks. Therefore, the statement that the engineer can add a node using the service IP address is false.

The *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* details management tools:

- Option A: False. “SmartKit is used for hardware inspection, OS installation, and firmware upgrades, but it does not provide alarm reporting, file upload, or remote access capabilities.”

- Option B: True. “DeviceManager supports resource allocation, user management, data protection, performance monitoring, and alarm management.”

- Option C: True. “DME IQ provides cloud-based management, remote maintenance, and predictive analytics.”

- Option D: True. “The CLI supports all listed functions, including resource allocation and alarm management.”

Thus, option A 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.

The HyperCDP (Continuous Data Protection) feature in Huawei all-flash storage, like OceanStor Dorado, provides high-frequency snapshots. The *HCIP-Storage V5.5 Training Material (Module 2: Flash Storage Technologies)* states:

- Option A: True. “HyperCDP snapshots can be used for data analysis, application testing, and backup, as they provide consistent point-in-time copies.”

- Option B: True. “After a HyperCDP snapshot is created, write requests to the source LUN use copy-on-write (COW) technology, storing new data in a new storage pool location and updating the source LUN’s pointer.”

- Option C: False. The material clarifies: “HyperCDP snapshots can be directly mapped to hosts as read-only LUNs, without requiring file system sharing, for accessing point-in-time data.”

- Option D: False. “HyperCDP is optimized for high-density snapshots with low memory overhead, using metadata structures rather than full file system objects.”

Thus, options A and B are true.

Changing the management network port IP in Huawei flash storage systems is a common initialization task. The *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* states:

- Option A: False. “The CLI command to change the management IP is ‘change system management_ip_address,’ not ‘change system management_ip.’”

- Option B: True. “Management and maintenance network ports must use different network segments to avoid routing conflicts.”

- _Index C: False. “No license is required to change the management network port IP address; it is a basic configuration task.”

- Option D: True. “For serial port login, the maintenance terminal’s IP and the default management IP must be in the same segment to establish connectivity.”

Thus, options A and C are false.

SPC (Storage Performance Council) benchmarks are discussed in the *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)*: “SPC-1 tests random I/O workloads, such as OLTP, database, and email scenarios, while SPC-2 tests sequential large I/O access, such as video streaming or backups.” Let’s evaluate:

- Option A: Incorrect. SPC-2 is for sequential large I/Os, not random small I/Os (which is SPC-1).

- Option B: Incorrect. SPC-1 is for random I/Os, not sequential large I/Os.

- Option C: Correct. SPC-2 is designed for sequential large I/O access scenarios.

- Option D: Incorrect. SPC-1, not SPC-2, tests OLTP, database, and email scenarios.

Thus, option C is true.

The OceanStor Pacific series employs data reconstruction to recover from node or disk failures. The *HCIP-Storage V5.5 Training Material (Module 3: Scale-Out Storage Technologies)* states: “In OceanStor Pacific, data reconstruction for a faulty disk or node begins automatically based on system policies, but the default delay is not fixed at 15 minutes. The reconstruction start time depends on configurable parameters, such as the system’s fault detection and stabilization period, typically ranging from immediate to several minutes, adjusted via DeviceManager.” The specific claim of a 15-minute delay is not mentioned in the official documentation, and reconstruction timing is flexible, making the statement false.

The question focuses on the running statuses of remote replication pairs in Huawei’s flash storage systems, such as OceanStor Dorado. The *HCIP-Storage V5.5 Training Material (Module 4: Storage Design and Implementation)* details the remote replication feature and its statuses. The material states: “When the pair running status is ‘Normal,’ the remote replication pair is fully synchronized, meaning data between the primary and secondary LUNs is consistent, and synchronization is complete.” This matches option C.

- Option A: Incorrect. The training material indicates that if a pair is deleted from one site, causing inconsistency, the status may not necessarily change to “To be recovered.” Instead, it may require manual intervention or reconfiguration, and “To be recovered” is typically associated with link failures or incomplete synchronization, not deletion.

- Option B: Incorrect. The “Split” status occurs when the pair relationship is interrupted, but it can be due to manual intervention or automatic triggers (e.g., link failure). The parenthetical “not manually” is misleading, as the material does not restrict “Split” to non-manual causes.

- Option D: Incorrect. The “To be synchronized” status indicates that the pair is preparing for synchronization but is not yet consistent. There is no requirement to manually disconnect the pair for single LUN service needs, as the system can operate with the primary LUN independently during this state.

Thus, option C is the only accurate statement based on official documentation.