QUESTION 121
When delivering a Huawei OceanStor Pacific scale-out storage project, an engineer introduced the end-to-end data integrity check technology of scale-out storage to the customer. Which of the following statements are false about this technology?
A. This technology enables the storage system to implement periodic background data integrity check. When the service load is heavy or service access is frequent, the system automatically starts periodic background data integrity check and self-healing.
B. For silent data scenarios such as bit change and read offset, the end-to-end data integrity check technology supports logical block addressing (LBA) check of clusters and hosts.
C. In this technology, write requests are checked at the system entry (virtual block service). User data is checked again in the object storage device (OSD) before being written to disks. Data is written to disks only after the data integrity check succeeds.
D. Block, NAS, and object services support end-to-end data integrity check, but the HDFS service does not.
Correct Answer: BCD
QUESTION 122
NVMe over Fabrics can map NVMe commands and data to multiple fabric links, including Fibre Channel, InfiniBand, RoCE v2, iWARP, and TCP.
A. TRUE
B. FALSE
Correct Answer: A
QUESTION 123
When delivering a Huawei OceanStor Pacific scale-out storage project, Huawei engineers introduced the end-to-end load balancing capability 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. Routes at the service layer balance storage space and accelerate fault reconstruction.
D. 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.
Correct Answer: ACD
QUESTION 124
A school has purchased two Huawei OceanStor Pacific series storage devices for service deployment. An engineer wants to configure the distributed parallel client (DPC) on the storage devices. Which of the following statements is false about the engineer’s configuration?
A. When the storage network is a Remote Direct Memory Access over Converged Ethernet (RoCE) network, the engineer can run the “systemctl stop lldpad.service” command to disable the lldpad service.
B. When creating a namespace, the engineer needs to select a security style and application type.
C. If upper-layer services require high data security, the engineer needs to set the storage pool type to “Self-encrypting” when creating a converged storage pool.
D. Before creating a converged storage pool, the engineer must enable the file service for nodes on DeviceManager.
Correct Answer: D
QUESTION 125
Which of the following statements is false about the software logical architecture of Huawei OceanStor Pacific series products?
A. At the service layer, Distributed Relational Object Service (DROS) processes all structured services. Unstructured services are processed by an independent block module.
B. In the OceanStor Pacific series products, the storage management module is responsible for management and control plane services (such as resource management, user management, and installation and deployment).
C. The persistence layer is responsible for space allocation and fault management of disk media, and provides reliable and scale-out data management capabilities through EC or copies.
D. The HDFS srv module at the access layer provides standard HDFS protocol access processing.
Correct Answer: A
QUESTION 126
In structured scenarios of Huawei converged storage systems, SmartQoS is classified into the negative feedback-based adaptive algorithm and volume-based I/O flow control management algorithm. Which of the following statements is false about the volume-based I/O flow control management algorithm?
A. In this scenario, the administrator needs to limit the total performance of the volume in the system. By collecting the pressure of the host on the volume, the administrator can adjust the token speed of the volume in the token bucket on each node to limit the overall IOPS.
B. The more tokens the I/O queue of a volume has, the more I/O resources the system allocates to the volume.
C. QoS flow control requires management of volume I/o queues.
D. If the traffic to be restricted is IOPs, one I/o consumes one token. If the traffic to be restricted is bandwidth, one byte corresponds to one token.
Correct Answer: A
QUESTION 127
Assume a financial customer purchases several Huawei scale-out storage devices for service deployment. Unstructured services require multiple network planes. Which statement about the network planes is false?
A. The management network is used for system management and maintenance. It is connected to the customer’s management network.
B. The internal management network is used for communication between storage and management nodes, including deployment and upgrade, resource configuration, performance alarm reporting, and certificate and key update.
C. For the file service in the Distributed Parallel Client (DPC) scenario, the back-end storage network is available for communication with compute nodes to process communication data between the DPC and Object Storage Device (OSD).
D. The service network is connected to the customer’s application system and accesses the storage through the S3, HDFS, NFS, CIFS, and POSIX interfaces.
Correct Answer: C
QUESTION 128
To install the hardware of a Huawei OceanStor Pacific series storage device, keyboard, video, and mouse (KVM) signal cable connection is required. If the cabinet is not full, any empty video graphics adapter (VGA) ports must be plugged with a KVM cable with the other end of the cable bound to the mounting bar of the cabinet.
A. TRUE
B. FALSE
Correct Answer: A
QUESTION 129
In the delivery as bay scenario, the tool can help plan and design flash storage devices before installation. It also performs hardware configuration and device networking, and can help quickly generate low level design (LLD) documents and configuration files for storage devices.
Correct Answer: LLDesigner
QUESTION 130
For device reliability purposes, during the quick installation of Ocean Stor Pacific 9550, engineers need to connect power cables on the storage device supplied by two power modules to separate power distribution units (PDUs).
A. TRUE
B. FALSE
Correct Answer: A
QUESTION 131
Before configuring services for Huawei flash storage, you need to initialize the system. Which statement about the initialization is false?
A. During security configuration management, read-only users have only the access permission to the storage device, that is, they can only perform query operations.
B. When the TCP+ SSL/TLS protocols are used for Syslog alarm notification, you need to set the certificate verification mode to improve the security of storage system logs.
C. During the wizard-based initialization, you need to configure basic information, such as device information, device time, and licenses.
D. You must change the IP addresses of the management network port and maintenance network port using the command-line interface (CLI) before applying for and activating a license.
Correct Answer: D
QUESTION 132
Assume a government office purchases multiple Huawei scale-out storage systems to provide the file service for upper-layer applications. Which statement is false about storage switch requirements during Distributed Parallel Client (DPC) setup?
A. The IP address of the management network port on the switch must be configured.
B. Multiple switches can form an M-LAG. When the InfiniBand transmission protocol is used, subnet management must be enabled.
C. When the Remote Direct Memory Access over Converged Ethernet (RoCE) transmission protocol is used, the VLANs and flow control must be configured.
D. If the control network does not cross subnets but cross-subnet capacity expansion is required later, the VLANs and flow control must be configured while there is no specific requirement for the control network gateway.
Correct Answer: A
QUESTION 133
Assume an industry customer purchased several Huawei all-flash devices for service deployment. During routine storage management, an engineer found that the disk read/write speed and IOPs are too high and the system response is slow frequently. The possible cause is insufficient bandwidth or improper RAID for the storage array.
A. TRUE
B. FALSE
Correct Answer: A
QUESTION 134
The backup and archiving scenario mainly involves sequential read of large I/Os, where there are more read I/Os than write I/Os and hot data areas are obvious. The service characteristics of this scenario are the same as those of the database OLAP scenario.
A. TRUE
B. FALSE
Correct Answer: B
QUESTION 135
Space is allocated when new data is written into a LUN, leading to frequent read and write I/Os of metadata and a longer write process.
Correct Answer: thin
QUESTION 136
When troubleshooting performance issues of flash storage based on the I/o path, an engineer first needs to analyze the CPU performance of controllers. Generally, Fibre Channel networking consumes more CPU resources than iSCSI networking, and random I/Os consume more CPU resources than sequential I/Os.
A. TRUE
B. FALSE
Correct Answer: A
QUESTION 137
In Huawei OceanStor Dorado series storage, disks, controllers, CPUs, memory modules, interface modules, and power modules are replaceable units and can be hot-swapped.
A. TRUE
B. FALSE
Correct Answer: B
QUESTION 138
In Huawei flash storage, if an engineer wants to remotely power on the storage system, the engineer must make an appropriate networking plan for the controller enclosures of the storage system. Which of the following statements is false about the networking principles of a storage system with multiple controller enclosures?
A. All power cables have been connected properly to the controller enclosures.
B. The maintenance terminal has been connected to any service network port on any controller enclosure.
C. The maintenance network ports of all the controller enclosures have been connected correctly in accordance with standard networking.
D. All scale-out cables have been connected properly to the controller enclosures.
Correct Answer: B
QUESTION 139
In a production environment, a user can use the command-line interface (CLI) or DeviceManager for routine O&M and management on storage devices. Which of the following statements are false about the two tools?
A. Generally, the user can log in to DeviceManager on any maintenance terminal connected to the storage system by entering the service network port IP address of the storage system and the local or domain user name in a browser.
B. When logging in to DeviceManager, the user needs to enter the IP address in the https://xxx.xxx.xxx.xxx:8088 format. If the IP address is not followed by a port number, the login will fail.
C. In the CLI, keywords of commands are in bold, and parameters of commands are in italics.
D. When using the CLI, the user must comply with its format conventions. For instance, the format [ x | y |… ] indicates that at least one option must be selected from two or more choices, and all options can be selected if needed.
Correct Answer: ABD
QUESTION 140
A financial customer purchases several Huawei flash storage devices for subsequent service deployment. During deployment delivery, engineers can use the tool to inspect the software and hardware status, value-added services, and alarms of the storage devices on the maintenance terminal.
Correct Answer: SmartKit