Free Practice Questions for Huawei H19-308_V4.0 Exam

This statement aligns with the market analysis provided in Huawei’s OceanStor Pacific pre-sales documentation regarding the "Yottabyte Era". Huawei highlights that the nature of data is shifting away from structured databases toward massive volumes of unstructured data, such as high-definition video, medical images, IoT sensor logs, and AI training datasets.

By 2025, it is projected that80% of new data generatedwill be unstructured. This trend is the primary driver behind the development of the OceanStor Pacific series, which is ascale-out distributed storagesystem specifically designed to handle the capacity and performance requirements of unstructured data at scale. Traditional centralized arrays (SAN/NAS) are often ill-equipped to handle the sheer volume and file counts associated with this growth, necessitating the move toward distributed architectures that can scale horizontally to hundreds of petabytes.

The Huawei OceanStor Dorado series is engineered for 99.9999% availability using multiple layers of reliability. Option A is correct as RAID-TP (Triple Parity) is a unique Huawei feature that uses three parity chunks to tolerate the simultaneous failure of any three SSDs in a disk group. Furthermore, the SmartMatrix full-mesh architecture in high-end models allows the system to remain operational even if seven out of eight controllers in a controller enclosure fail, ensuring extreme service continuity.

Option B is correctbecause Huawei utilizesGlobal Wear Levelingto distribute writes across all SSDs to extend their lifespan, andAnti-Wear Levelingto prevent multiple SSDs from reaching their end-of-life simultaneously, which avoids multi-disk failure risks.Option C is correctas the system supportsHyperMetro(Active-Active) for both block (SAN) and file (NAS) services, providing zero RTO and RPO across sites.Option D is correctbecause Dorado supports high-reliability disk enclosure connection technologies; in a multi-enclosure setup, the system can tolerate the failure of an entire disk enclosure without data loss by using intelligent data distribution across different enclosures.

This statement is false because it confuses RTO (Recovery Time Objective) with RPO (Recovery Point Objective). In Huawei’s Disaster Recovery (DR) documentation, these two metrics are defined as follows:

RPO (Recovery Point Objective):Refers to the maximum amount of data loss an organization can tolerate, measured in time. It indicates the "point in time" to which data must be recovered (e.g., "we can only lose 1 hour of data").

RTO (Recovery Time Objective):Refers to the duration of time within which a business process must be restored after a disaster. It measures how long the system can be down before the business is significantly impacted (e.g., "the system must be back online within 4 hours").

The question describes the "point in time" (RPO) but labels it as RTO. In a high-availability solution likeHyperMetro, the RTO and RPO are both theoretically zero, meaning no data loss and no downtime.

The SMB (Server Message Block) protocol, which is primarily used for Windows-based file sharing, relies on a centralized authentication and authorization mechanism to manage permissions in an enterprise environment. In Huawei OceanStor NAS documentation, Active Directory (AD) is the primary domain controller system supported for the SMB protocol.

When a Huawei storage system joins an Active Directory domain, it can authenticate users and groups defined in the AD, allowing for seamless integration with Windows environments. WhileLDAP (Option A)andNIS (Option B)are supported by Huawei NAS for theNFSprotocol (typically used in Linux/Unix environments), the SMB protocol is inherently designed to work with the Kerberos and NTLM authentication provided by Microsoft’s Active Directory. This ensures that NTFS-style ACLs (Access Control Lists) can be properly mapped and enforced across the network.

Huawei OceanStor BCManager (Business Continuity Manager) is the dedicated software suite designed for managing disaster recovery and backup environments. While other tools perform different functions, BCManager is specifically engineered to orchestrate the entire DR lifecycle:

Management (eReplication):This component manages disaster recovery for various applications (like databases and VMs). It automates the recovery process, performs DR drills without interrupting services, and visualizes the DR topology.

Backup (eBackup):This component handles the backup of virtualized environments.

In contrast,DeviceManager (Option B)is the on-box management tool for single-array configuration.SystemReporter (Option A)is used for performance analysis and reporting.eService (Option D)is a cloud-based proactive monitoring and maintenance platform. Therefore, BCManager is the correct choice for specialized DR management.

NVMe over Fabrics (NVMe-oF) using the RoCE v2 (RDMA over Converged Ethernet) protocol is a high-speed communication technology supported by Huawei OceanStor Dorado systems. Option B is correct because RoCE v2 utilizes RDMA, which allows data to be transferred directly from the memory of one computer to another without involving the CPU of either system. This significantly reduces latency and CPU overhead compared to traditional iSCSI.

Option C is correctbecause RoCE v2 requires a "Lossless Ethernet" environment to function correctly. Traditional Ethernet (Option A) is a "best-effort" delivery system that allows for packet drops during congestion; however, RDMA protocols are highly sensitive to packet loss. To support RoCE v2, the network must implement Data Center Bridging (DCB) features like Priority Flow Control (PFC) and Enhanced Transmission Selection (ETS) to ensure a zero-packet-loss environment. Regarding cost (Option D), RoCE v2 often leverages existing Ethernet infrastructure, making it generally more cost-effective than deploying a dedicated Fibre Channel (FC) fabric, which requires specialized HBAs and FC switches.

When classifying storage by its underlying architecture rather than its transmission protocol, Huawei distinguishes between two main structures. Centralized SAN (Option D) refers to the traditional controller-based array, such as the OceanStor Dorado or OceanStor Hybrid series. In this architecture, all storage resources are managed by a centralized pair or cluster of controllers within a single enclosure system. This provides high stability and specialized data services but has physical limits on the number of controllers and disks it can scale to.

Distributed SAN (Option B), such as theOceanStor Pacific(formerly FusionStorage), utilizes a scale-out architecture. It aggregates the local storage of multiple standard x86 or ARM servers into a massive, unified virtual storage pool. This architecture eliminates the bottlenecks of centralized controllers, allowing for near-infinite scalability in both performance and capacity by simply adding more nodes. WhileIP SANandFC SANare valid terms, they classify storage by thenetwork protocolused (Ethernet/IP vs. Fibre Channel) rather than the organizational architecture of the storage system itself.

In Huawei OceanStor Hybrid Flash systems, performance optimization is achieved through intelligent resource management. Level-2 cache (Option A), known as SmartCache, utilizes SSDs as an extension of the system’s DRAM cache. By storing "hot" data on high-speed SSDs, the system significantly reduces the read latency for frequently accessed blocks that have been evicted from the primary memory cache.

Storage tiering (Option D), orSmartTier, automatically migrates data blocks between different storage tiers (SSD, SAS, and NL-SAS) based on their access frequency. It ensures that active data resides on the highest-performance media while moving inactive "cold" data to high-capacity drives. These two features are specifically designed to maximize IOPS and minimize response times. In contrast,Thin Provisioning (SmartThin)andData Deduplication (SmartDedupe)are "Storage Efficiency" features; their primary goal is to save physical space and improve capacity utilization. While essential for TCO, they do not inherently improve raw system performance and may involve a minor metadata overhead during processing.