H13-624_V5.5 Exam Dumps - Huawei HCIP-Storage Questions and Answers

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.

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 question focuses on the client access modes supported by Huawei OceanStor Pacific series storage systems, particularly for parallel access scenarios. The *HCIP-Storage V5.5 Training Material (Module 3: Scale-Out Storage Technologies)* explains: “The OceanStor Pacific series supports the NFS (Network File System) client access mode, which enables a single client to connect to multiple storage nodes for parallel data access. This mode is optimized for high-performance computing (HPC) workloads and supports MPI-I/O (Message Passing Interface Input/Output) for distributed applications.” NFS allows clients to access file systems across multiple nodes, facilitating scalable and parallel I/O operations, which aligns with the question’s description. The acronym “NFS” is the correct answer.

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.

This question focuses on CLI operations for Huawei OceanStor Pacific scale-out storage systems. The *HCIP-Storage V5.5 Training Material (Module 3: Scale-Out Storage Technologies)* provides guidance on CLI access modes: “To switch from the user view to the developer view on the CLI for OceanStor Pacific systems, the command ‘change user_mode current_mode user_mode=developer’ is used. This command elevates the user’s privilege level to access advanced configuration and debugging options.” Let’s evaluate the options:

- Option A: Incorrect. The command `change domain ad_manager` relates to Active Directory management, not view switching.

- Option B: Incorrect. The command `change dns general` configures DNS settings, not user modes.

- Option C: Correct, as it matches the documented command for switching to developer view.

- Option D: Incorrect. The command `change nas_Idap` configures LDAP settings for NAS services, not CLI view modes.

Thus, option C is the correct command.

The *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* outlines troubleshooting principles: “Basic troubleshooting principles include prioritizing high-severity alarms, analyzing external factors (e.g., network or host issues) before internal storage issues, and addressing network alarms before network element (NE) alarms to rule out connectivity issues.” Let’s evaluate:

- Option A: Correct principle. Network alarms are analyzed first to exclude external connectivity issues.

- Option B: Not a principle. The material does not prioritize general alarms over specific ones; it focuses on severity and context.

- Option C: Correct principle. Higher-severity alarms are addressed first to mitigate critical issues.

- Option D: Correct principle. External factors are checked before internal storage issues.

Thus, option B is not a basic troubleshooting principle.

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 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.