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

In Huawei OceanStor Hybrid Flash systems, performance optimization is achieved through intelligent resource management. Level-2 cache (Option A), known as SmartCache, utilizes SSDs as an extension of the system’s DRAM cache. By storing "hot" data on high-speed SSDs, the system significantly reduces the read latency for frequently accessed blocks that have been evicted from the primary memory cache.

Storage tiering (Option D), orSmartTier, automatically migrates data blocks between different storage tiers (SSD, SAS, and NL-SAS) based on their access frequency. It ensures that active data resides on the highest-performance media while moving inactive "cold" data to high-capacity drives. These two features are specifically designed to maximize IOPS and minimize response times. In contrast,Thin Provisioning (SmartThin)andData Deduplication (SmartDedupe)are "Storage Efficiency" features; their primary goal is to save physical space and improve capacity utilization. While essential for TCO, they do not inherently improve raw system performance and may involve a minor metadata overhead during processing.

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.

This statement is false because the Air Gap isolation zone is one of the most critical components of the Huawei OceanProtect ransomware protection solution. Huawei provides a comprehensive "four-layer" protection framework for data resilience, where Air Gap technology serves as the final, most secure layer.

TheAir Gapfeature creates a security isolation zone for backup data. Under normal operations, the replication link between the production backup storage and the isolation zone storage is physically or logicallydisconnected(the "gap"). The link only opens during a specific, scheduled window to replicate "clean" data from the production site to the isolation zone, and it is immediately closed once replication is finished. This ensures that even if ransomware compromises the main network and production storage, the data in the Air Gap isolation zone remains "invisible" and unreachable to the attacker. Combined with secure snapshots and WORM, this allows organizations to recover their business from an uninfected copy of the data, making Air Gap a core supported feature of the OceanProtect portfolio.

In Huawei OceanStor systems, a snapshot is not a full physical copy of the data. Huawei uses a technology called HyperSnap, which typically employs a "Copy-on-Write" (COW) or "Redirect-on-Write" (ROW) mechanism.

When a snapshot is created, the system generates a point-in-time (PIT) logical image of the source LUN. It does not immediately duplicate the data blocks; instead, it records the state of the data at that specific moment. If data in the source LUN is subsequently modified, the original data is preserved (in COW) or new data is written to a new location (in ROW) to maintain the integrity of the snapshot. Because only the metadata and the changed blocks are managed, snapshots are created near-instantaneously and consume very little initial space.

A "full copy" would be referred to as aClone (HyperClone)or aLUN Copy, both of which require a 1:1 ratio of physical storage space relative to the source and take significant time to complete. Therefore, a snapshot is a virtual, point-in-time image, not a full physical duplicate.

In Huawei OceanStor NAS systems, data consistency and integrity are maintained through a mechanism known as File Locking. When User A opens a file for modification (a write operation), the storage system applies a "Write Lock" or an "Exclusive Lock" to that specific file. This lock prevents other users from performing any actions that would alter the file's metadata or content, as these concurrent changes would lead to data corruption or "lost updates".

Consequently,File deletion (Option A),File modification (Option C), andFile renaming (Option D)are all blocked because they require write-level access or changes to the file system's directory structure that conflict with the active lock held by User A. However,File reading (Option B)is generally permitted unless User A has specifically requested an exclusive lock that bars all access. In standard CIFS/SMB and NFS configurations used by Huawei, multiple users can read a file while one user is writing, ensuring that information remains accessible without compromising the integrity of the file being updated.

This statement is false because Huawei's new-generation OceanStor hybrid flash storage features a converged (Unified) architecture that supports Native NAS capabilities directly within the storage controllers. In older storage generations or with competitors, an external "NAS Gateway" or "Filer" was often required to provide file services on top of block storage.

Huawei’sHyperMetro for NASis a gateway-free active-active solution. The file systems are managed natively by the storage OS (OceanStor OS), allowing both SAN and NAS services to benefit from the same high-availability features. By eliminating the need for an external gateway, Huawei simplifies the network topology, reduces hardware costs (TCO), and minimizes latency by removing an extra processing hop for file data. This native integration allows for seamless cross-site active-active deployments for file protocols like CIFS/SMB and NFS, just as it does for block protocols.

HyperCDP (Continuous Data Protection) is a feature specifically designed for high-density, high-frequency data protection in Huawei OceanStor Dorado systems. While standard snapshots (HyperSnap) have limits on the total number of point-in-time copies and the frequency at which they can be taken, HyperCDP allows for the creation of snapshots at intervals as short as several seconds.

HyperCDP achieves this by utilizing a specialized metadata management system that minimizes the impact on system performance during the snapshot creation process. It can support up to 60,000 recovery points per LUN, providing a much finer granularity for data recovery than traditional backup or snapshot technologies. This is particularly useful for protecting against ransomware or logical data corruption, as it allows an administrator to roll back a database or volume to a state just seconds before the incident occurred.HyperReplication (Option B)is for remote DR,HyperLock (Option C)is for WORM/compliance, andHyperVault (Option D)is an integrated backup tool for older hybrid systems.

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.