H19-308_V4.0 Exam Dumps - Huawei HCS-Pre-sales Questions and Answers

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.

Huawei OceanProtect utilizes source deduplication to optimize the data protection process. In traditional backup scenarios, the entire dataset is sent over the network to the backup target, which can consume significant bandwidth and time. With source deduplication, the storage system or backup agent identifies redundant data blocks at the source—before they are sent over the network.

By comparing new data chunks against a local cache of already-transmitted fingerprints, the system ensures that only unique, non-duplicate data is physically moved across the production-to-backup link. This significantlyreduces network bandwidth consumptionand effectively increases thelogical backup bandwidth, as the system can process larger volumes of data without being limited by physical network throughput. Consequently, thebackup window is shortened, allowing organizations to meet tight RPOs even in environments with limited network resources or massive data growth.

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 Dwilloccur.

Soft Quota (700 GB):This is a flexible limit combined with a grace period. When the limit is exceeded, the system issues an alarm butcontinues to allow data writesuntil the grace period expires or the hard quota is reached. Therefore, Option B willNOToccur.

Advisory Quota (600 GB):This is purely for monitoring and reporting. When reached, the system simply triggers an administrative alarm or notification; itnever restricts data writes. Therefore, Option C willNOToccur.

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."

Huawei OceanStor Dorado utilizes RAID 2.0+ block virtualization technology, which supports Dynamic RAID Reconstruction. In a traditional RAID environment, if a disk fails, the RAID group continues to operate in a "degraded" mode until the disk is replaced. However, in Dorado's RAID 2.0+, the system uses a distributed spare space policy where spare capacity is spread across all disks in the pool.

When one SSD fails in a storage pool originally configured with RAID 6 (7 data chunks + 2 parity chunks), the system identifies that it no longer has enough physical disks to maintain a 7+2 stripe width. To maintain the same level of protection (dual parity) while utilizing the remaining 8 disks, the system dynamically adjusts the RAID policy for new writes and reconstructed data toRAID 6 (6+2). This ensures that the data remains protected by two parity chunks even with a reduced disk count. This "shrinkage" of the stripe width allows the system to remain in a "healthy" protected state rather than staying in "degraded" mode indefinitely.

Huawei provides tailored solutions for Medical PACS based on the specific performance and scale requirements of healthcare providers. OceanStor Dorado NAS (Option D) is recommended for the "Hot Data" or active tier of a PACS system. Because medical images between 100 KB and 1 MB require high-concurrency access and extremely low latency for immediate clinical review, the FlashLink® technology and all-flash architecture of the Dorado series provide the necessary IOPS to prevent bottlenecks during peak hours.

OceanStor Pacific (Option C)is the primary recommendation for the massive, long-term unstructured data storage required by PACS. A single hospital can generate petabytes of data over several years. OceanStor Pacific’s scale-out architecture allows it to handle billions of small files efficiently using a global namespace, and its high-ratio Erasure Coding (EC) ensures maximum capacity utilization and lower TCO for archives. While Hybrid Flash (Option A) can be used, it is often superseded by the superior performance of Dorado or the superior scalability of Pacific in modern medical environments. FusionCube (Option B) is an HCI solution more suited for edge computing or virtualization rather than specialized, large-scale medical imaging repositories.

For "Safe City" projects involving massive video surveillance (such as 10,000+ camera streams), Huawei recommends the OceanStor Pacific series (distributed storage). Large-scale video surveillance generates immense volumes of unstructured data that must be written continuously and stored for long periods. A traditional centralized NAS or SAN often faces performance bottlenecks at the controller level when handling thousands of concurrent high-definition video streams.

OceanStor Pacific uses ascale-out architecturethat allows performance and capacity to scale linearly. For 10,000 cameras, the system can aggregate the bandwidth of dozens or hundreds of nodes, providing the high throughput required for video ingestion and the massive capacity required for long-term retention. Additionally, OceanStor Pacific supports high-ratio Erasure Coding (EC), which provides better disk utilization (up to 91%) than traditional RAID, significantly reducing the Total Cost of Ownership (TCO) for petabyte-scale surveillance archives.

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.

Huawei’s HyperLock feature provides WORM (Write Once, Read Many) functionality for NAS file systems. When a file is placed in the WORM state, the storage system strictly enforces a policy where the file's data can be accessed and read by authorized users, but any attempt to modify, overwrite, or delete the file is blocked by the storage controller.

In the Huawei OceanStor system, a file enters the WORM state after it is "locked." Once locked, the file remains in a read-only state for a defined retention period. During this time, not even an administrator can modify the file's content or reduce its protection duration. This is critical for meeting regulatory compliance (such as SEC Rule 17a-4) and for protecting sensitive data against ransomware, as it ensures that once data is archived, it remains immutable and verifiable. Only after the retention period has expired can the file be deleted, though it can still never be modified.

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.

A Storage Area Network (SAN) is a dedicated network for block-level data access. Huawei OceanStor systems support a variety of block-access protocols to ensure compatibility with different infrastructure environments. Fibre Channel (FC) is the industry standard for high-performance enterprise SANs, offering dedicated, low-latency, and lossless delivery. iSCSI provides block-level storage over standard TCP/IP Ethernet networks, making it a flexible and cost-effective alternative for many organizations.

InfiniBand (Option B)is a high-bandwidth, low-latency interconnect protocol often used in High-Performance Computing (HPC) and specialized SAN clusters to connect compute nodes to storage pools at extremely high speeds.NFS (Option D)is excluded from this answer because it is aNAS (Network Attached Storage)protocol. NFS (Network File System) provides file-level access rather than block-level access. While modern Huawei systems like the OceanStor Dorado series are "Unified Storage" (supporting both SAN and NAS on the same hardware), technically, only A, B, and C are considered SAN protocols.