Huawei H19-308_V4.0-ENU Exam
HCSA-Presales-Storage V4.0
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, 1.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.
2.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.
3.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:
2two8
HCSA-Presales-Storage V4.0
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H19-308_V4.0-ENU questions and answers in the first attempt.
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1two8
, 1.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.
2.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.
3.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:
2two8
