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When learning the SmartVirtualization feature of Huawei flash storage, a new employee is not familiar with eDevLUNs and external LUNs. Which of the following statements are true about the eDevLUNs and external LUNs?

A.

An eDevLUN consists of actual data and metadata. The storage space required by metadata is provided by the heterogeneous storage system, and the physical space required by actual data is provided by the local storage system.

B.

If the administrator has not configured any value-added feature for eDevLUNs, each eDevLUN occupies small space in the storage pool of the local storage system.

C.

eDevLUNs belong to storage pools created in the local storage system.

D.

eDevLUNs can be created regardless of whether external LUNs are normal.

The LUN active-active balancing feature of Huawei all flash storage Integrates the global load balancing.design. The front-end interface board evenly distributes I/Os to the target controller for load balancing.

An engineer can use the ______ tool to install software for Huawei storage systems. This tool can collect and evaluate storage compatibility information in one-stop mode and supports batch installation of the UltraPath software, improving the software installation efficiency.

Cache policies and configurations are involved in storage-layer performance optimization of Huawei flash storage. Which of the following statements is false about the high and low watermarks of a cache?

A.

Generally, the low watermark for storing dirty data in the cache should not be too low. The recommended value is 20%.

B.

Generally, the high watermark of the cache should not be too high, and the difference between the high and low watermarks should not be too small.

C.

If the high watermark of the cache is too high, I/O fluctuation and latency increase will occur usually when the current I/O traffic bursts.

D.

If the high watermark of the cache is too high, the write performance will be affected. If the low watermark of the cache is too low, the read performance will be affected.

Assume a financial customer purchased several Huawei scale-out storage devices for deploying the video surveillance service. This service has high requirements on performance. Therefore, the cache write policy must be set to write-through for the storage devices.

A.

TRUE

B.

FALSE

When delivering a Huawel OceanStor Pacific scale-out storage project, Huawei engineers Introduced the end-to-end load balancing capabllty supported by the scale-out storage to the customer. Which of the following statements are false about the load balancing capability?

A.

The route-based hash policy of the persistence layer is different from that of the service layer. The route-based hash policy of the persistence layer is implemented based on weights, while that of the service layer is implemented based on STORE DHT.

B.

Unstructured and structured services at the service layer have different route-based hash policies. However, both unstructured and structured services are mapped based on the same basic routing model.

C.

In load balancing at the semantic layer, a directory is divided into 256 partitions by default and can be adjusted to a maximum of 512 partitions.

D.

Routes at the service layer balance storage space and accelerate fault reconstruction.

Which of the following statements are false about direct TCP offload engine (DTOE) 1.0? Select all that apply.

A.

This technology uses the polling mode, reducing the latency.

B.

This technology allows to directly operate the hardware queue in the user mode, avoiding the context switching overhead.

C.

High latency overhead still exists using the technology, such as kernel mode interrupts, locks, system calls, and thread switching.

D.

This technology requires CPU to process each MAC frame, which will consume a large number of CPU resources.

Assume a scientific research Industry customer purchased several Huavvel OceanStor Pacific series scale-out storage devices for service deployment, and an engineer has configured the file service in the Distributed Parallel Client (DPC) scenario on the storage devices. To meet high performance requirements of front end services, the engineer wants to enable the CPU performance mode for the DPC node using the CU. Which of the following commands can be used to enable the CPU performance mode?

A.

cpupower frequency-info

B.

cpupower frequency-set -g performance

C.

change service ndmp_restart_servlce

D.

change pms converged_qos_policy

Huawei OceanStor Pacific series storage systems provide a recycle bin function. When a storage system deletes an old dentry. It records a write-ahead log (WAL) twice. In addition, after the dentry is deleted, the inode is also deleted.

A.

TRUE

B.

FALSE

A government customer has purchased several Huawei scale-out storage devices, and an engineer wants to install the distributed parallel client (DPC). When creating DPC nodes, the engineer can manually add a node by entering the service IP address of the node.

A.

TRUE

B.

FALSE