Free Huawei H19-308_V4.0 Practice Exam with Questions & Answers | Set: 2

Huawei’s HyperReplication technology is designed to provide robust data redundancy across geographically separated storage systems. According to official technical specifications, Huawei storage supports two primary replication modes:

Synchronous Remote Replication (Option A): In this mode, data is written to both the local and remote storage systems simultaneously. The host receives a write-completion acknowledgement only after the data is successfully stored in both locations. This ensures zero data loss (RPO = 0) but is sensitive to network latency and is typically limited to distances within 100km to 300km.

Asynchronous Remote Replication (Option C): Data is first written to the local storage, and the host receives an immediate acknowledgement. The data is then synchronized to the remote site at defined intervals or based on specific triggers. This mode is not limited by distance and has minimal impact on application performance, though it carries a risk of minor data loss (RPO > 0).

Terms like " Semi-synchronous " or " Semi-asynchronous " (Options B and D) are not standard replication modes in the Huawei OceanStor architectural framework.

DAS has several recognized disadvantages in enterprise storage architecture. Because storage is directly attached to one server, it is difficult to expand flexibly across many hosts, which leads to poor scalability. Resource utilization is also low because unused capacity attached to one server cannot be easily shared by other servers. Reliability can also be limited because DAS usually lacks the advanced redundancy, multipathing, clustering, and centralized management features available in SAN or NAS storage systems. However, simple connection is not a disadvantage. It is actually one of DAS’s main advantages. DAS is easy to deploy because it connects directly to the server through local interfaces without requiring FC switches, Ethernet storage networks, or complex configuration. Therefore, the option that is not a disadvantage of DAS is simple connection.

The new-generation OceanStor hybrid flash storage is designed to support modern cloud-native workloads, including those running in containerized environments. To facilitate the connection between storage resources and container orchestrators like Kubernetes, Huawei supports several key plug-ins:

CSI (Container Storage Interface) (Option D): This is the industry-standard interface that allows the storage system to provide persistent volumes (PVs) to containers. By using the Huawei CSI plug-in, users can automate the provisioning, mounting, and management of LUNs (SAN) and File Systems (NAS) directly from Kubernetes manifests.

CDR (Container Disaster Recovery) (Option A): In addition to basic connectivity, Huawei provides the CDR plug-in to manage data protection for containerized applications. CDR enables backup and disaster recovery capabilities for persistent data, ensuring that if a container cluster or a data center fails, the application data can be recovered at a secondary site using replication or backup technologies.

Plug-ins like CSS or ECS (Options B and C) are generally related to other cloud services or specific compute instances and are not the primary container storage plug-ins associated with the OceanStor hybrid flash series.

The new-generation OceanStor hybrid flash storage supports multiple disk storage pool types to meet different performance and capacity requirements. An SSD pool is used when applications require high IOPS and low latency. An HDD pool is used for capacity-oriented workloads where cost per terabyte is more important than flash-level performance. A mixed SSD + NL-SAS HDD pool is also supported for hybrid scenarios, allowing hot data to benefit from flash performance while colder data is stored on high-capacity NL-SAS disks. This aligns with the hybrid flash design goal: balance cost, performance, and capacity through tiered media. By supporting these pool types, OceanStor hybrid flash storage can serve both performance-sensitive and capacity-heavy enterprise workloads. Therefore, all listed options are correct.

OceanStor Dorado is Huawei’s all-flash storage platform positioned around performance, reliability, scenario coverage, and intelligent operations. Option A reflects the performance highlight: Dorado is designed for extremely high IOPS and ultra-low latency, making it suitable for databases, virtualization, core banking, and latency-sensitive enterprise workloads. Option B is also valid because Dorado covers both SAN and NAS scenarios and is positioned as a leading all-flash storage system across industries. Option C is correct because Dorado’s high-end SmartMatrix architecture and HyperMetro capabilities provide strong resilience, including controller-level fault tolerance for mission-critical services. Option D is correct because Huawei emphasizes intelligent O & M through cloud-based analytics, proactive risk identification, and simplified management. Together, these highlights describe Dorado’s value proposition: fast, reliable, broadly applicable, and intelligently managed.

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 like HyperMetro , the RTO and RPO are both theoretically zero, meaning no data loss and no downtime.

OceanStor Pacific is Huawei’s distributed scale-out storage platform and supports multiple storage service types for different enterprise workloads. It provides file services for NAS scenarios through protocols such as NFS and SMB/CIFS. It provides object services for massive unstructured data, cloud-native applications, backup, archive, and S3-compatible access. It also supports HDFS services for big data analytics workloads, allowing big data platforms to use OceanStor Pacific as a storage backend. In addition, OceanStor Pacific supports block services for distributed SAN-style scenarios where applications need block-level access. This multi-service capability is one of the main advantages of OceanStor Pacific because it allows one distributed storage platform to support file, object, big data, and block workloads without deploying separate storage silos. Therefore, all listed options are correct.

The statement is false. DAS, or Direct-Attached Storage, is not a centralized shared storage architecture. It is storage that connects directly to a single server or host without passing through a dedicated storage network. Because of this direct connection, the storage resources are normally controlled by the attached server and are not naturally shared by multiple servers. A centralized shared storage system is more accurately represented by SAN or NAS. SAN provides shared block-level storage to multiple hosts through FC, iSCSI, or similar storage networks, while NAS provides shared file-level storage through protocols such as NFS or SMB/CIFS. DAS is simple and low-cost for small deployments, but it has limitations in scalability, sharing, and centralized management. Therefore, DAS should not be described as centralized shared storage.

Enterprise storage systems and general-purpose servers differ mainly in reliability engineering, data protection design, and availability architecture. Production quality control is a key difference because storage systems are built and validated specifically for continuous data services, strict compatibility, and long-term reliability. Power failure protection is also important because storage systems use mechanisms such as cache protection, battery backup, supercapacitors, or data vaulting to prevent data loss during unexpected power failures. High availability architecture is another major difference. Enterprise storage commonly includes redundant controllers, redundant power supplies, redundant paths, hot-swappable components, and failover mechanisms. Price alone is not a technical differentiator because both servers and storage systems vary widely in cost depending on configuration. The real differences are engineering reliability, power-loss protection, and HA architecture.

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.