Practice Free H19-308_V4.0-ENU Exam Online Questions
Question #11
The OceanStor Dorado series includes entry-level, mid-range, and high-end product models.
- A . TRUE
- B . FALSE
Correct Answer: A
Question #12
Which of the following domain controller systems is supported by the SMB protocol?
- A . LDAP
- B . NIS
- C . Active Directory
Correct Answer: C
C
Explanation:
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. While LDAP (Option A) and NIS (Option B) are supported by Huawei NAS for the NFS protocol (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.
C
Explanation:
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. While LDAP (Option A) and NIS (Option B) are supported by Huawei NAS for the NFS protocol (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.
Question #13
With adaptive data locality rearrangement on writes, the data dispersion is calculated in real time when backup data is written and data distribution on disks is adjusted.
During backup data recovery, only a few sequential reads are required, improving HDD recovery performance.
- A . TRUE
- B . FALSE
Correct Answer: A
Question #14
A customer wants to purchase an object storage system to be used by different departments. These departments are independent of each other and cannot access each other’s data. Therefore, the data capacity of different departments needs to be limited.
Which of the following object storage features will you recommend to the customer? (Select all that apply)
- A . Replication
- B . WORM
- C . Multi-tenancy
- D . Quota
Correct Answer: C, D
C, D
Explanation:
To meet the customer’s requirement for departmental isolation and resource control, Huawei recommends the combination of Multi-tenancy (Option C) and Quotas (Option D).12
Multi-tenancy is the foundational feature for iso3lation in Huawei object storage. It allows the physical storage system to be logically partitioned into multip4le "Tenants". Each department can be assigned its own tenant environment with its own set of users, access keys, and buckets. Data is logically isolated, meaning one department cannot see or access the data of another unless explicitly permitted.
Quota management is then used to limit the capacity consumed by each department. In Huawei OceanStor Pacific, quotas can be applied at the Tenant level or the Bucket level. By setting a Tenant Quota, the administrator ensures that a specific department does not exceed its allocated budget of storage space, preventing one department from exhausting the resources of the entire system. While Replication (Option A) and WORM (Option B) are valuable for data protection, they do not address the specific needs of departmental isolation and capacity limiting.
C, D
Explanation:
To meet the customer’s requirement for departmental isolation and resource control, Huawei recommends the combination of Multi-tenancy (Option C) and Quotas (Option D).12
Multi-tenancy is the foundational feature for iso3lation in Huawei object storage. It allows the physical storage system to be logically partitioned into multip4le "Tenants". Each department can be assigned its own tenant environment with its own set of users, access keys, and buckets. Data is logically isolated, meaning one department cannot see or access the data of another unless explicitly permitted.
Quota management is then used to limit the capacity consumed by each department. In Huawei OceanStor Pacific, quotas can be applied at the Tenant level or the Bucket level. By setting a Tenant Quota, the administrator ensures that a specific department does not exceed its allocated budget of storage space, preventing one department from exhausting the resources of the entire system. While Replication (Option A) and WORM (Option B) are valuable for data protection, they do not address the specific needs of departmental isolation and capacity limiting.
Question #15
Which of the following will NOT occur after you set the hard, soft, and advisory quotas for a 1 TB directory to 800 GB, 700 GB, and 600 GB, respectively? (Select all that apply)
- A . The total capacity of the directory cannot exceed 1 TB.
- B . When the used capacity of the directory exceeds 700 GB, data cannot be written.
- C . When the used capacity of the directory exceeds 600 GB, data cannot be written.
- D . When the capacity of the directory exceeds 800 GB, data cannot be written.
Correct Answer: B, C
B, C
Explanation:
Huawei’s SmartQuota feature allows administrators to manage storage consumption at the directory, user, or user-group level using three types of thresholds:
Hard Quota (800 GB): This is a strict limit. Once the used capacity reaches this value, the storage system will immediately prevent any further write operations to that directory.
Therefore, Option D will occur.
Soft Quota (700 GB): This is a flexible limit combined with a grace period. When the limit is exceeded, the system issues an alarm but continues to allow data writes until the grace period expires or the hard quota is reached. Therefore, Option B will NOT occur.
Advisory Quota (600 GB): This is purely for monitoring and reporting. When reached, the system simply triggers an administrative alarm or notification; it never restricts data writes. Therefore, Option C will NOT occur.
Option A is also correct because the directory is part of a 1 TB file system; it can never exceed the physical size of its parent container. Thus, only B and C are the actions that "will NOT occur."
B, C
Explanation:
Huawei’s SmartQuota feature allows administrators to manage storage consumption at the directory, user, or user-group level using three types of thresholds:
Hard Quota (800 GB): This is a strict limit. Once the used capacity reaches this value, the storage system will immediately prevent any further write operations to that directory.
Therefore, Option D will occur.
Soft Quota (700 GB): This is a flexible limit combined with a grace period. When the limit is exceeded, the system issues an alarm but continues to allow data writes until the grace period expires or the hard quota is reached. Therefore, Option B will NOT occur.
Advisory Quota (600 GB): This is purely for monitoring and reporting. When reached, the system simply triggers an administrative alarm or notification; it never restricts data writes. Therefore, Option C will NOT occur.
Option A is also correct because the directory is part of a 1 TB file system; it can never exceed the physical size of its parent container. Thus, only B and C are the actions that "will NOT occur."
Question #16
When RAID 5 is configured for the new-gen OceanStor hybrid storage, how many write penalties are generated in one full-stripe write operation?
- A . 2
- B . 4
- C . 0
- D . 1
Correct Answer: C
C
Explanation:
In Huawei OceanStor storage systems utilizing RAID 2.0+ and the SmartMatrix architecture, the "write penalty" associated with traditional RAID is mitigated through Full-Stripe Writes. In a partial write (where only some data in a stripe is updated), a RAID 5 setup usually suffers a write penalty of 4 (Reading old data, reading old parity, writing new data, writing new parity).
However, Huawei’s controllers utilize a large cache to aggregate incoming data. When enough data is collected to fill an entire stripe (e.g., 8 data chunks plus 1 parity chunk in an 8+1 RAID 5 setup), the system performs a Full-Stripe Write. In this scenario, the system calculates the parity in the CPU/cache and writes the entire stripe to the disks at once. Since no old data or old parity needs to be read from the physical disks before writing, the disk-level write penalty is 0. This significantly enhances the write performance of hybrid arrays, especially those using mechanical HDDs which are highly sensitive to the latency of extra read/write operations.
C
Explanation:
In Huawei OceanStor storage systems utilizing RAID 2.0+ and the SmartMatrix architecture, the "write penalty" associated with traditional RAID is mitigated through Full-Stripe Writes. In a partial write (where only some data in a stripe is updated), a RAID 5 setup usually suffers a write penalty of 4 (Reading old data, reading old parity, writing new data, writing new parity).
However, Huawei’s controllers utilize a large cache to aggregate incoming data. When enough data is collected to fill an entire stripe (e.g., 8 data chunks plus 1 parity chunk in an 8+1 RAID 5 setup), the system performs a Full-Stripe Write. In this scenario, the system calculates the parity in the CPU/cache and writes the entire stripe to the disks at once. Since no old data or old parity needs to be read from the physical disks before writing, the disk-level write penalty is 0. This significantly enhances the write performance of hybrid arrays, especially those using mechanical HDDs which are highly sensitive to the latency of extra read/write operations.
Question #17
Which of the following are supported by OceanStor Dorado high-end models? (Select all that apply)
- A . Tolerance of the failure of one controller enclosure
- B . Symmetric active-active controllers
- C . Smart disk enclosures
- D . Automatic tiering between SSD and HDD
Correct Answer: A, B, C
A, B, C
Explanation:
Huawei OceanStor Dorado high-end models (such as the 18000 series) utilize the SmartMatrix 4.0 architecture to provide industry-leading resilience.
Option A is correct because these models can tolerate the failure of an entire controller enclosure (containing 4 controllers) without interrupting services, as the other enclosure in the cluster continues to handle all I/O.
Option B is correct because Dorado features a Symmetric Active-Active design where any LUN is not owned by a specific
controller; instead, any controller in the cluster can directly access any LUN, eliminating the performance bottleneck caused by traditional ALUA (Asymmetric Logical Unit Access) and ensuring load balancing.
Option C is correct as Huawei employs Smart Disk Enclosures equipped with their own CPU and memory. These enclosures can offload tasks like data reconstruction (RAID rebuilds) from the main controllers, significantly speeding up recovery times and reducing the performance impact on host I/O during a disk failure.
Option D is incorrect because OceanStor Dorado is an All-Flash array; it does not support HDDs and therefore does not perform tiering between flash and mechanical media (which is a function of the OceanStor Hybrid Flash series).
A, B, C
Explanation:
Huawei OceanStor Dorado high-end models (such as the 18000 series) utilize the SmartMatrix 4.0 architecture to provide industry-leading resilience.
Option A is correct because these models can tolerate the failure of an entire controller enclosure (containing 4 controllers) without interrupting services, as the other enclosure in the cluster continues to handle all I/O.
Option B is correct because Dorado features a Symmetric Active-Active design where any LUN is not owned by a specific
controller; instead, any controller in the cluster can directly access any LUN, eliminating the performance bottleneck caused by traditional ALUA (Asymmetric Logical Unit Access) and ensuring load balancing.
Option C is correct as Huawei employs Smart Disk Enclosures equipped with their own CPU and memory. These enclosures can offload tasks like data reconstruction (RAID rebuilds) from the main controllers, significantly speeding up recovery times and reducing the performance impact on host I/O during a disk failure.
Option D is incorrect because OceanStor Dorado is an All-Flash array; it does not support HDDs and therefore does not perform tiering between flash and mechanical media (which is a function of the OceanStor Hybrid Flash series).
Question #18
What are the typical application scenarios for SAN storage?
- A . Just a Bundle of Disks (JBOD)
- B . File sharing
- C . Virtualization
- D . Database
Correct Answer: BCD
Question #19
Which protocol is not a front-end protocol of SAN?
- A . iSCSI
- B . Fibre Channel
- C . NFS
- D . InfiniBand
Correct Answer: C
Question #20
Which of the following are differences between scale-out storage and array storage?
- A . Elastic scalability: thousands of nodes
- B . Performance:100,000/1,000,000-level IOPS
- C . Performance: TB-level bandwidth
- D . Large volume: 10 PB or more data
Correct Answer: ACD