Exam: H19-308_V4.0

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The H19-308_V4.0 (HCSA-Presales-Storage V4.0) is a certification exam from Huawei designed for presales engineers who manage storage products and solutions.

Exam Key Details
Certification Name: HCSA-Presales-Storage V4.0.
Exam Code: H19-308_V4.0 (English version).
Exam Duration: Typically 90 minutes.
Question Formats: Multiple-choice (single and multiple response), True/False, and occasionally drag-and-drop or simulation questions.
Testing Partner: Exams are usually administered through Pearson VUE.

Core Knowledge Domains
The exam evaluates your ability to understand and design Huawei storage solutions, covering the following areas:

Storage Foundations: SAN storage, NAS storage, and object storage architectures.
Huawei Main Products: Features of OceanStor Dorado all-flash storage, OceanStor hybrid flash, and OceanStor Pacific scale-out storage.
Data Protection: Backup and disaster recovery solutions, specifically using OceanProtect backup storage.
Networking Basics: TCP/IP architecture, IP addressing, subnetting, and protocol interaction (ICMP).
Presales Services: Pricing, compliance, security, and privacy concepts related to storage services.

Exam Preparation Resources
Official Training: Access learning materials on the Huawei Talent Online platform.
Mock Exams: You can find sample questions and flashcards on platforms like Quizlet.
Practice Questions: Third-party providers like Testpassport and DumpsPedia provide updated 2026 practice questions and exam dumps.

The primary exam topics include:

1. Storage Fundamentals
Disk and Data Protection: Core concepts of HDDs vs. SSDs and data protection mechanisms like RAID (e.g., RAID 10 disk requirements).
Storage Types: Identifying differences between SAN, NAS, and Object storage architectures.

2. SAN and NAS Technologies
SAN Storage: Understanding networking, protocols (FC, iSCSI), and primary SAN technologies.
NAS Storage: Knowledge of file system protocols (NFS, SMB), sharing between different OS environments, and NAS-specific features.
Protocols: Support for Active Directory and LDAP in domain controller systems.

3. Object Storage and Data Management
Object Storage Features: Protocol support and direct access methods for object-based storage.
Storage Efficiency: Implementing Thin Provisioning, QoS (Flow Control), and Storage Tiering.
Intelligent Caching: Use of Level-2 (SSD) cache to enhance system performance.

4. Backup and Disaster Recovery (DR)
Core Concepts: Understanding backup networking modes and DR protection layers (Storage, Network, Host layers).
Replication: Differences between synchronous and asynchronous replication, and the role of quorum servers in Active-Active modes.

5. Huawei Storage Product Solutions
Product Identification: Matching customer requirements to specific Huawei solutions like the OceanStor Dorado series.
OceanStor Dorado Features: Understanding its all-flash architecture, convergence capabilities, and high-performance Active-Active (gateway-free) modes.
Presales Strategy: Identifying key competitive advantages and solution scenarios for Huawei storage products.

For official study resources and scheduling, you can visit the Huawei Talent Portal.

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Sample Question and Answers

QUESTION 1
Compared with HDDs, SSDs have high I/O performance and low latency.

A. TRUE
B. FALSE

Answer: A

Explanation:
According to Huaweis technical documentation on storage media, Solid State Drives (SSDs)
fundamentally differ from Hard Disk Drives (HDDs) in their physical construction and data access
methods. HDDs rely on mechanical components, including rotating platters and moving read/write
heads. This mechanical nature introduces "rotational latency" and "seek time," which inherently limit
the number of Input/Output Operations Per Second (IOPS).
In contrast, Huaweis OceanStor SSDs utilize flash memory chips (NAND Flash) and a highperformance
controller. Because there are no moving parts, the "seek time" is eliminated, allowing
for near-instantaneous data access. This results in significantly higher random IOPS and much lower
latency (often measured in microseconds rather than milliseconds). Furthermore, Huaweis
FlashLinkâ® technology further optimizes the collaboration between the storage controller and the
SSDs, ensuring that even as the drive fills up, the performance remains consistent and the latency
remains low. Therefore, in any performance-oriented storage environment, SSDs are the preferred
choice over traditional HDDs.

QUESTION 2
Which RAID level cannot provide data redundancy protection?

A. RAID 5
B. RAID 6
C. RAID 1
D. RAID 0

Answer: D

Explanation:
In the Huawei OceanStor RAID 2.0+ architecture, Redundant Array of Independent Disks (RAID) levels
are used to balance performance, capacity, and reliability. RAID 0, also known as "striping,"
distributes data blocks across multiple physical disks to maximize I/O performance. By allowing
multiple disks to be read or written simultaneously, it provides the highest throughput and capacity utilization (100%).
However, the defining characteristic of RAID 0 is the complete lack of redundancy. Unlike RAID 1
(Mirroring), RAID 5 (Parity), or RAID 6 (Dual Parity), RAID 0 does not store redundant information or
parity bits. Huawei documentation explicitly states that if any single physical disk in a RAID 0 group
fails, the entire RAID group becomes inaccessible, and all data within that group is lost. Therefore,
RAID 0 is strictly recommended only for temporary data or scenarios where data loss is acceptable
and maximum performance is the sole priority. For enterprise production environments, Huawei
recommends RAID 5, RAID 6, or RAID-TP.

QUESTION 3
What are the main application scenarios for SAN storage? (Select all that apply)

A. Big data storage
B. VMware virtualization
C. Database
D. Mass file sharing

Answer: B, C

Explanation:
Storage Area Network (SAN) storage is designed to provide block-level data access to servers,
appearing to the operating system as a locally attached hard drive. Huawei OceanStor SAN solutions
(both FC-SAN and IP-SAN) are optimized for high-performance, low-latency applications.
Databases (Option C), such as Oracle, SQL Server, and DB2, are primary use cases for SAN storage
because they require high IOPS and low latency for transactional processing. The block-level access
allows the database management system to have granular control over data placement and caching.
VMware virtualization (Option B) is another core scenario. SANs provide the shared storage
necessary for advanced features like VMotion, High Availability (HA), and Distributed Resource
Scheduler (DRS). In these environments, multiple ESXi hosts connect to a centralized SAN to access
VMFS (Virtual Machine File System) volumes. While Option A (Big Data) and Option D (File Sharing)
often use Distributed Storage (OceanStor Pacific) or NAS, the high-concurrency, structured nature of
Databases and Virtualization makes them the definitive scenarios for SAN.

QUESTION 4
RAID 0 is actually a mirroring technology.

A. TRUE
B. FALSE

Answer: B

Explanation:
This statement is false because RAID 0 and Mirroring (RAID 1) are fundamentally different concepts
in Huawei storage technology. As defined in the Huawei technical manual, RAID 0 is "Striping." It
breaks data into chunks and spreads them across multiple disks to increase performance. It has no redundancy.
"Mirroring" is the terminology specifically used for RAID 1. In a RAID 1 configuration, the system
writes the exact same data to two separate physical disks simultaneously. This creates a 100%
redundant copy (a mirror). If one disk fails, the other continues to provide data, ensuring zero
downtime and no data loss. Huawei's RAID 2.0+ virtualization technology can implement striping and
mirroring across different "chunks" or "extents" within a storage pool, but it maintains the technical
distinction: RAID 0 is for performance through striping, while mirroring is for reliability through
duplication. Therefore, characterizing RAID 0 as a mirroring technology is a technical inaccuracy.

QUESTION 5
Which statements are correct about NVMe over Fabrics (NVMe-oF) (RoCE v2)? (Select all that apply)

A. Traditional Ethernet can transmit NVMe-oF (RoCE v2) data packets without packet loss.
B. NVMe-oF (RoCE v2) significantly improves performance by using Remote Direct Memory Access (RDMA).
C. Lossless Ethernet can transmit NVMe-oF (RoCE v2) data packets.
D. The cost of NVMe-oF (RoCE v2) is generally higher than that of NVMe-oF (Fibre Channel).

Answer: B, C

Explanation:
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 correct because 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 costeffective
than deploying a dedicated Fibre Channel (FC) fabric, which requires specialized HBAs and FC switches.

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