H19-308_V4.0 Exam Dumps - HCSA-Presales-Storage V4.0

In the Huawei OceanStor RAID 2.0+ architecture, Redundant Array of Independent Disks (RAID) levels are used to balance performance, capacity, and reliability. RAID 0, also known as "striping," distributes data blocks across multiple physical disks to maximize I/O performance. By allowing multiple disks to be read or written simultaneously, it provides the highest throughput and capacity utilization (100%).

However, the defining characteristic of RAID 0 is the complete lack of redundancy. Unlike RAID 1 (Mirroring), RAID 5 (Parity), or RAID 6 (Dual Parity), RAID 0 does not store redundant information or parity bits. Huawei documentation explicitly states that if any single physical disk in a RAID 0 group fails, the entire RAID group becomes inaccessible, and all data within that group is lost. Therefore, RAID 0 is strictly recommended only for temporary data or scenarios where data loss is acceptable and maximum performance is the sole priority. For enterprise production environments, Huawei recommends RAID 5, RAID 6, or RAID-TP.

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 high-end OceanStor Dorado 18000 series is designed with the SmartMatrix 4.0 full-mesh architecture, which provides the industry's highest level of controller redundancy. In a standard configuration with 8 controllers (housed in two enclosures), the system can tolerate extreme failure scenarios without service interruption:

Individual Failures (Option A, C):The system easily handles the failure of one or two controllers as the remaining controllers take over the workload transparently.

Extreme Controller Failure (Option B):Due to the full-mesh interconnect where all controllers share a global memory cache and can access all backend disks, the system can tolerate the failure of up toseven out of eight controllers. As long as one controller remains active, services continue.

Enclosure Failure (Option D):Because the architecture is mirrored across controller enclosures, theentire failure of one controller enclosure(containing 4 controllers) is tolerated.

This level of resilience ensures that mission-critical applications remain online even in the face of catastrophic hardware events, maintaining 99.9999% availability.

Huawei’s 3DC (Three-Data-Center) solution is designed for high-level business continuity, typically involving a local HA site and a remote DR site. The documentation supports three main topological configurations to meet different reliability and performance needs:

Cascading Network (Option B):Site A (Production) replicates to Site B (Local DR), and Site B then replicates to Site C (Remote DR). This reduces the pressure on the production site (Site A) as it only manages one replication link.

Parallel Network (Option C):Site A replicates directly to both Site B and Site C simultaneously. This provides better protection for the data at Site C, but increases the load and bandwidth requirements on Site A.

DR Star Network (Option A):This is a specific variant of the multi-site protection architecture used in Huawei'sHyperMetro + Remote Replicationscenarios. It typically combines an active-active setup between Site A and B with an asynchronous link to Site C, ensuring that even if two sites fail, the third contains a survivable copy of the data.

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."