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

The *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* addresses performance issue demarcation: “If the latency on the compute side is significantly higher than on the storage side, the issue is likely outside the storage system, such as in the host, network, or application layer. If the storage side showed high latency (e.g., due to disk performance limits), it would be reflected in the STORAGE metrics.” The statement incorrectly attributes the issue to the storage system, as higher compute-side latency points to external factors, making it false.

Configuring file services in Huawei scale-out storage systems, such as OceanStor Pacific, involves specific steps for standard protocols like NFS or CIFS. The *HCIP-Storage V5.5 Training Material (Module 4: Storage Design and Implementation)* states: “To configure file services, the engineer must create a converged storage pool to allocate resources, create namespaces for organizing file systems, and enable file services on the relevant nodes. The Distributed Parallel Client (DPC) is optional and used for high-performance parallel file access, not a requirement for standard protocol scenarios.” Let’s evaluate:

- Option A: Not required. DPC is not mandatory for standard file service protocols.

- Option B: Required. A converged storage pool is needed to provide storage capacity.

- Option C: Required. Namespaces organize file service resources.

- Option D: Required. Enabling file services on nodes activates the protocols.

Thus, option A is the action not needed.

The SmartMigration feature in Huawei OceanStor Dorado enables seamless data migration between LUNs, as detailed in the *HCIP-Storage V5.5 Training Material (Module 4: Storage Design and Implementation)*. Let’s analyze each option:

- Option A: True. The material states: “SmartMigration between heterogeneous storage systems relies on SmartVirtualization to take over the source LUN, ensuring compatibility and seamless migration.”

- Option B: True. The material confirms: “The target LUN capacity must be greater than or equal to the source LUN capacity to accommodate all data during migration.”

- Option C: True. The material notes: “A LUN already mapped to an application server cannot be used as the target LUN for SmartMigration, as it would disrupt existing mappings.”

- Option D: False. The material explains: “The migration rate affects system resources. Setting the highest migration rate under heavy host service load can degrade performance due to resource contention. The rate should be adjusted based on load to minimize impact.” This makes the statement false, as high migration rates are not recommended during heavy loads.

Thus, option D is false.

The Huawei Ocean Protect Appliance leverages CPU core grouping and intelligent scheduling to optimize performance, as described in the *HCIP-Storage V5.5 Training Material (Module 2: Flash Storage Technologies)*. The material states: “CPU core grouping and intelligent scheduling in Ocean Protect appliances enable physical and logical isolation of resources, ensuring that specific cores are dedicated to specific tasks. This isolation reduces contention and minimizes latency for critical operations.” This directly supports option C, as the technology’s primary advantage is reducing latency through resource isolation.

- Option A: Incorrect. While load balancing is a feature of some Huawei storage systems, the training material does not specify that CPU core grouping and intelligent scheduling in Ocean Protect appliances focus on distributing jobs for load balancing. Instead, it emphasizes resource isolation.

- Option B: Incorrect. The material indicates that this technology prevents core overload by isolating tasks, avoiding high latency, making this statement false.

- Option D: Incorrect. Prefetching data and metadata to improve cache hit ratios is unrelated to CPU core grouping and scheduling, which focus on processor resource management, not cache operations.

Thus, option C is the correct advantage of this technology.

The software installation process for Huawei OceanStor Pacific scale-out storage systems is detailed in the *HCIP-Storage V5.5 Training Material (Module 3: Scale-Out Storage Technologies)*. Let’s evaluate each option:

- Option A: True. The material states: “For block service installation with converged compute and storage nodes, each node requires at least 20 vCPUs to support management and data processing tasks.”

- Option B: True. The material confirms: “In converged deployments, the disk quantity difference between any two nodes in a storage pool must not exceed 2 or 30% of the disk count on the node with the most disks to ensure balanced performance.”

- Option C: False. The material explains: “Wizard-based software installation automates node addition, network configuration, and control cluster creation via DeviceManager, reducing manual steps. Engineers do not need to perform these tasks manually before installing the OceanStor Pacific software.” This makes the statement incorrect.

- Option D: True. The material notes: “DPC installation requires a minimum of 20 GB of memory on compute nodes to ensure stable operation.”

Thus, option C is false.

The *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* describes user roles in Huawei flash storage systems: “The administrator role is a built-in role with full privileges, including managing users, performing system upgrades, changing the system time, powering off the device, and restarting the device.” This role is designed for comprehensive system management, confirming that the statement is true.

The SmartMigration feature in Huawei OceanStor Pacific enables data migration between storage resources. The *HCIP-Storage V5.5 Training Material (Module 4: Storage Design and Implementation)* explains: “The split mode and migration rate of a SmartMigration task can be modified only when the task is in certain statuses, such as Interrupted, Paused, or Faulty. When the task is in the Migrating status, changes to split mode or migration rate are not allowed, as the system is actively transferring data.” This is because modifying parameters during active migration could disrupt the process or cause data inconsistency. Let’s evaluate:

- Option A: Interrupted allows changes, as the task is stopped.

- Option B: Paused allows changes, as the task is temporarily halted.

- Option C: Faulty allows changes, as the task is not actively running.

- Option D: Migrating does not allow changes, as the task is in progress.

Thus, option D is the status that prevents changes.

The HyperClone feature in Huawei OceanStor Dorado systems creates full data copies for reliability and testing. The *HCIP-Storage V5.5 Training Material (Module 2: Flash Storage Technologies)* states: “HyperClone creates a full copy of a source LUN to a target LUN. A source LUN can form multiple HyperClone pairs with different target LUNs. Data copying starts at synchronization, but hosts must wait for the copy to complete before accessing the target LUN. HyperClone supports bidirectional synchronization, allowing data restoration from target to source. For block storage, it uses redirect-on-write (ROW), while file system clones use copy-on-write (COW).” Let’s evaluate:

- Option A: False. The material confirms that a source LUN can form multiple HyperClone pairs with different target LUNs.

- Option B: False. Hosts cannot access the target LUN until the copy process completes, contrary to the statement.

- Option C: True. Bidirectional synchronization is supported, including restoration from target to source.

- Option D: True. The material distinguishes ROW for block clones and COW for file system clones.

Thus, options A and B are false.

This question tests knowledge of the reliability features of the Huawei OceanStor Pacific series, as covered in the *HCIP-Storage V5.5 Training Material (Module 3: Scale-Out Storage Technologies)*. Let’s evaluate each option:

- Option A: False. The training material states: “OceanStor Pacific uses advanced erasure coding (EC) and multi-copy technologies for data reliability, moving beyond traditional disk-level RAID modes.” While RAID-like concepts may be used internally, the system primarily relies on distributed EC or replication, not traditional RAID, making this statement inaccurate.

- Option B: True. The material confirms: “Kunpeng processors integrate multiple chip functions, reducing points of failure and enhancing hardware reliability.” This is a correct statement.

- Option C: True. The material notes: “Link aggregation ensures transmission link redundancy, with automatic switchover or isolation for faulty or subhealthy links, maintaining service continuity.” This is accurate.

- Option D: False. The material clarifies: “Multi-copy technology ensures data redundancy across nodes, but it does not implement intra-node RAID. If a node fails, reliability depends on inter-node copies or EC, and it is not necessarily higher than EC mechanisms, which are optimized for distributed systems.” This makes the statement false, as it misrepresents the technology and its comparative reliability.

Thus, options A and D are false.

The Direct TCP Offload Engine (DTOE) 1.0 is a performance optimization feature in Huawei flash storage systems. The *HCIP-Storage V5.5 Training Material (Module 2: Flash Storage Technologies)* explains: “DTOE 1.0 offloads TCP processing from the CPU to dedicated hardware, reducing CPU resource consumption and latency. It operates in user mode to manage hardware queues, avoiding context switching overhead, and uses polling mode to minimize interrupt latency. Unlike traditional TCP processing, DTOE eliminates kernel mode interrupts, locks, system calls, and thread switching.” Let’s evaluate:

- Option A: False. DTOE offloads MAC frame processing to hardware, not the CPU, reducing CPU resource usage.

- Option B: True. The material confirms that DTOE operates in user mode, avoiding context switching.

- Option C: True. Polling mode is used to reduce latency, as stated in the material.

- Option D: False. DTOE eliminates kernel mode overheads like interrupts and system calls, contrary to the statement.

Thus, options A and D are false.

This question addresses the behavior of remote replication consistency groups in Huawei storage systems, such as OceanStor Dorado or Pacific series. According to the *HCIP-Storage V5.5 Training Material (Module 4: Storage Design and Implementation)*, a consistency group ensures that multiple remote replication tasks operate as a single unit to maintain data consistency across LUNs or volumes. The material states: “In a remote replication consistency group, if one replication task fails (e.g., due to a link failure or configuration issue), the entire consistency group is affected, and other tasks do not continue running normally. The system suspends all tasks in the group to preserve data consistency until the faulty task is resolved or manually split.” This ensures that dependent data sets remain synchronized. Therefore, the statement that other tasks run normally without waiting for the faulty task is false, as the consistency group halts all tasks to maintain integrity.

Configuring iSCSI block services on Huawei scale-out storage, like OceanStor Pacific, involves specific steps. The *HCIP-Storage V5.5 Training Material (Module 4: Storage Design and Implementation)* states: “To enable iSCSI block services, the engineer must create a block storage pool to allocate storage resources and configure the iSCSI service to set up initiator-target relationships and network parameters.” Let’s evaluate:

- Option A: Required. A block storage pool is necessary to provide the capacity for iSCSI LUNs.

- Option B: Required. Configuring the iSCSI service is essential to enable the protocol and connectivity.

- Option C: Not required. DPC is used for file services, not iSCSI block services.

- Option D: Not required. DPC installation is unrelated to iSCSI configuration.

Thus, options A and B are mandatory.

The *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* addresses hardware maintenance: “Before removing a faulty interface module, engineers must perform pre-operations, such as disabling the module via DeviceManager or CLI, ensuring no active I/O, and verifying redundancy to avoid service disruption. Direct removal withoutthese steps can cause data loss or system errors.” The statement that the module can be removed without pre-operations is false, as these steps are mandatory.

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.

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.