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

The SmartEncryption feature in Huawei OceanStor Pacific ensures data security. The *HCIP-Storage V5.5 Training Material (Module 3: Scale-Out Storage Technologies)* explains:

- Option A: True. “For DPC or NFS reads, self-encrypting disks (SEDs) retrieve authentication keys from the key management server, decrypt ciphertext, and return plaintext to the protocol layer.”

- Option B: True. “SmartEncryption supports encrypted writes and decrypted reads via NFS, CIFS, HDFS, and S3 protocols.”

- Option C: False. “SmartEncryption encrypts data at the storage layer. Clients using NFS, CIFS, or DPC write data that is automatically encrypted by the system before storage, not written as plaintext.”

- Option D: True. “OceanStor Pacific uses SEDs for disk-level encryption, ensuring all service data is encrypted.”

Thus, option C is 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 *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.

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 *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* lists tenant management roles: “Tenant management roles include tenant administrator, tenant protocol administrator, and tenant data protection administrator, which manage resources, protocols, and data protection tasks within a tenant’s scope.” The security administrator is a system-wide role, not specific to tenant management, as it handles global security policies. Thus, option D is not a tenant management role.

This question pertains to the configuration of basic storage services in Huawei OceanStor Dorado series storage systems. According to the *HCIP-Storage V5.5 Training Material (Module 4: Storage Design and Implementation)*, basic service configuration involves essential steps to enable storage access for hosts. The material outlines the following:

- Configuring connectivity between a host and the storage system (Option A) is mandatory, as it involves setting up physical or logical connections (e.g., Fibre Channel or iSCSI) to allow the host to communicate with the storage system. Without this, no storage services can be accessed.

- Creating a mapping (Option C) is also mandatory, as it maps LUNs to hosts or host groups, enabling the host to access specific storage resources. The material states: “Mapping is a critical step to associate LUNs with hosts for service access.”

- Creating a port group (Option B) is optional. Port groups are used to organize front-end ports for specific purposes (e.g., load balancing or zoning), but they are not always required, especially in simpler configurations where default port settings suffice.

- Creating a LUN group (Option D) is optional. LUN groups simplify management by grouping multiple LUNs for mapping, but they are not mandatory if LUNs are mapped individually.

Thus, options B and D are optional operations, as they are not always required for basic service configuration.

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.

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 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.

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 *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 without these 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 *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.

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)* confirms: “The CLI command ‘show license_active’ is used to query details of activated licenses on Huawei flash storage systems, including license status and features enabled.” This makes the statement true, as the command is a standard tool for license management.

The integrated I/O stack in Huawei flash storage systems, such as OceanStor Dorado, is divided into layers, with the space management layer handling metadata and resource allocation. The *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* states: “The space management layer is responsible for metadata operations and space allocation. Key performance concerns include the cache hit ratio of hot metadata, which affects access speed, and CPU usage for background metadata management tasks, which impacts system efficiency.” Let’s evaluate:

- Option A: Correct. The material confirms that the cache hit ratio for hot metadata is critical for reducing latency in the space management layer.

- Option B: Correct. High CPU usage in metadata management can bottleneck performance, as noted in the material.

- Option C: Incorrect. Failover for protocol receiving threads is a concern for the data service layer, not the space management layer.

- Option D: Incorrect. The prefetch algorithm’s hit ratio is relevant to the data service layer, not space management.

Thus, options A and B are the performance concerns.

This question addresses the behavior of remote replication during a primary/secondary switchover in Huawei flash storage systems, such as OceanStor Dorado. The *HCIP-Storage V5.5 Training Material (Module 4: Storage Design and Implementation)* explains: “During a primary/secondary switchover in remote replication, the secondary site becomes the primary site and starts accepting write I/Os. The original primary site, if available, becomes the secondary site. Data changes are tracked incrementally, but full synchronization does not occur automatically after the switchover unless explicitly configured or triggered by a fault recovery process.” The question’s statement that “all data will be synchronized” implies an automatic full synchronization, which is not the default behavior. Instead, only incremental changes are synchronized when replication resumes, making the statement 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.