Free Practice Questions for Huawei H19-308_V4.0 Exam

Performance optimization in Huawei Hybrid Flash arrays is primarily handled by the SmartCache and SmartTier features, which leverage the speed of SSDs to compensate for the slower performance of HDDs:

SmartCache (Option C):This feature uses SSDs as a high-speedLevel-2 read cache. By caching frequently accessed "hot" data on SSDs, the system can respond to read requests with much lower latency than if it had to fetch data from mechanical SAS or NL-SAS drives.

SmartTier (Option D):This is anintelligent storage tieringfeature. It monitors data access frequency and automatically migrates active data blocks to the high-performance SSD tier, while moving inactive "cold" data to lower-cost HDD tiers. This ensures that performance-sensitive workloads always run on the fastest available media.

SmartDedupe (Option A)is a capacity efficiency feature for reducing redundant data.SmartAcceleration (Option B)is not a standard standalone feature name in the OceanStor Hybrid suite, although the system as a whole uses various acceleration algorithms.

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 OceanProtect provides a multi-layered defense to ensure that backup data remains immutable and protected from ransomware attacks. To specifically prevent data tampering and deletion, the following technologies are employed:

WORM (Write Once, Read Many) (Option C):This technology ensures that once data is written to the backup storage, it cannot be modified or deleted by any user (including administrators) until the specified retention period has expired.

Secure Snapshot (Option A):These snapshots are protected by a "read-only" attribute and a retention lock. Unlike standard snapshots, secure snapshots cannot be deleted manually before they expire, providing a reliable point-in-time recovery source even if the primary backup is targeted.

Air Gap (Option B):By physically or logically isolating a copy of the data in an "Air Gap" zone that is disconnected from the network most of the time, Huawei ensures that the data is unreachable for tampering or deletion by attackers who have gained access to the production network.

Detection and analysis (Option D)is part of the solution, but its purpose is toidentifyan ongoing attack or infected files, rather than physically preventing the tampering or deletion of the data itself.

In Huawei’s object storage management (OceanStor Pacific), quotas are a critical administrative tool for resource governance. Option C is correct as quotas serve as a fundamental method for controlling how much of the physical resource pool a specific entity (tenant or user) can access and consume.

Option A and D are correctbecause Huawei supports bothTenant-levelandBucket-levelquotas. Once a Hard Quota limit is reached for a tenant or a specific bucket, the storage system will reject further write requests (PUT operations) to prevent exceeding the allocated budget.Option B is correctbecause the storage management system (DeviceManager or eSight) integrates with the quota system to trigger alarms when usage reaches predefined thresholds (such as 80% or 90%) or when the resource limit is reached, allowing administrators to take proactive measures like expanding the quota or cleaning up data.

Huawei’s SmartThin technology is a thin provisioning feature that allows storage administrators to allocate more logical capacity to servers than is physically available in the storage pool. Traditionally, "thick provisioning" reserves the entire capacity of a LUN the moment it is created, leading to significant "stranded" or wasted space if the application does not immediately use it.

With SmartThin, the storage system only consumes physical blocks when data is actually written to the disk. This "on-demand" allocation ensures that physical resources are shared across multiple LUNs more efficiently. For example, a 10 TB LUN might be presented to a database, but if the database only contains 2 TB of data, only 2 TB of physical space is consumed. This significantly improves theStorage Resource Utilization Rateand reduces the Total Cost of Ownership (TCO) by delaying the need to purchase additional physical disks until the actual consumed capacity approaches the physical limits of the array.

According to Huawei’s BCManager and HyperReplication guides, "incorrect" statements must be identified to understand the distinction between disaster recovery (DR) and active-active solutions. Option B is incorrect because while HyperMetro supports automatic transparent failover (zero RTO) using a Quorum Server, standard synchronous remote replication typically requires manual intervention or third-party management software to trigger a switchover when the primary site fails. In synchronous replication, the secondary LUN is usually in a read-only state and cannot take over automatically without administrative action.

Option D is incorrectbecause it describes an "Active-Active" state. In a standard Remote Replication pair, only the primary LUN is accessible for host I/O (Read/Write), while the secondary LUN is locked to maintain data consistency. Only theHyperMetrofeature allows both LUNs in the pair to provide simultaneous read and write services to application servers across different sites. Regarding distance, while asynchronous replication is physically less constrained, synchronous and HyperMetro technologies are strictly limited by latency (typically requiring round-trip time <10ms and distance within 100km to 300km depending on the specific product line) to avoid severe application performance degradation.

Huawei distinguishes Scale-out Storage (OceanStor Pacific) from traditional Array Storage (Centralized SAN/NAS) based on its ability to handle the "Yottabyte Era" requirements of mass data.

Large Volume (Option A):While traditional arrays are limited by the number of controllers and disk enclosures they can address, scale-out storage is designed to aggregate thousands of nodes into a single global namespace, easily managing 10 PB or even EB-level data volumes.

TB-level Bandwidth (Option C):Distributed storage excels at throughput. By utilizing a high-speed interconnected network (InfiniBand or RoCE) and parallel access protocols like DPC, a scale-out cluster can deliver aggregate bandwidth in the range of TB/s, which is critical for HPC and big data analytics.

Elastic Scalability (Option D):Traditional arrays typically scale out to a few dozen controllers. OceanStor Pacific can scale out to 4,096 nodes in a single cluster, providing linear growth in both performance and capacity as nodes are added.

Performance in IOPS (Option B)is not adifferencein the sense that both systems provide IOPS; however, centralized all-flash arrays (Dorado) are often superior for low-latency, high-IOPS structured databases, whereas scale-out storage is primarily defined by its massive bandwidth and capacity scalability.

Huawei’s data protection solutions, particularly the OceanProtect and BCManager suites, support a wide range of backup targets to accommodate various Recovery Time Objectives (RTO) and Recovery Point Objectives (RPO).

Disk (Option C):This is the most common modern backup media (Disk-to-Disk or D2D), offering fast backup and recovery speeds. Huawei's OceanProtect is a dedicated high-speed disk-based backup storage.

Tape Library (Option D):Traditionally used for long-term archiving (D2D2T), tape remains a cost-effective and reliable "offline" storage medium for compliance and disaster recovery.

Disc (Option A):Optical discs (like Blu-ray) are used in specific archival scenarios where "Write Once" (WORM) physical media is required for regulatory purposes.

Cloud (Option B):Modern Huawei solutions supportBackup to Cloud, where data is deduplicated, compressed, and sent to an off-site object storage provider (like Huawei Cloud OBS) for cost-effective disaster recovery without the need for a physical secondary site.

Huawei OceanStor NAS systems provide a comprehensive Audit Log feature to track user activities for security and compliance purposes. This feature records metadata related to how files and directories are accessed and manipulated over the SMB or NFS protocols.

According to the Huawei technical reference, the audit mechanism captures a wide range of events, including:

File Opening (Option D):Records when a user accesses a file, including the timestamp and user ID.

File Modification (Option B):Tracks changes made to the content of a file.

File Renaming (Option A) and Deletion (Option C):Records structural changes to the file system, which is critical for identifying potential data theft or accidental loss.

By analyzing these logs, administrators can reconstruct the history of file operations to determine "who did what and when." This is a key component of Huawei’s data security framework, helping organizations meet internal auditing requirements and external regulatory standards.