Deck 9: HCNA-Storage-BSSN

Question 1

Which command is used to monitor the CPU usage in performance optimization of the N8500 clustered NAS storage systems?

A) sar -u 3 3
B) sar -r 3 3
C) sar -n DEV 2 2
D) sar -n CPU 2 2

Answer 1

sar -u 3 3

Question 2

Which of the following storage units are used by an N8500 clustered NAS system? (Select 3 answers)

A) S2200T
B) S2600T
C) S5500T
D) S6800T

Answer 2

S2600T
S5500T
S6800T

Question 3

When configuring file systems for the N8500 clustered NAS storage systems, you are advised to configure a file system size not larger than 32 TB and the size of small-file storage applications not larger than 16 TB to achieve satisfactory reliability and data recovery speed. (The small files here refer to the files with an average size of 1 MB.)

Answer 3

False

Question 4

If the service disk in slot 35 on a C node of the OceanStor 9000 is faulty, you are supposed to find this disk at the front panel of the C node and then replace it.

Question 5

Which of the following statements about CIFS service parameter settings on an OceanStor 9000 storage system is incorrect?

A) When the domain authentication mode is used, local users are not allowed to access CIFS shared directories.
B) When the user authentication mode is used, domain users are not allowed to access CIFS shared directories.
C) If you want users to access CIFS shared directories without entering user names or passwords, enable the guest mode.

Question 6

Which of the following are possible challenges facing massive data management? (Select 2 answers)

A) How to implement quick data searches for higher retrieval efficiency
B) How to ensure data authenticity and prevent data cheating
C) How to implement PB-level storage of various data
D) How to save storage resources by reducing the data amount

Question 7

A customer has purchased an N8500 clustered NAS storage system configured with SATA and NL-5AS disks. In order to strike a balance between RAID reliability and read/write performance, which of the following configuration plans is recommended?

A) 11-disk RAID 5 and one hot spare disk
B) 11-disk RAID 6 and one hot spare disk
C) 4-diskRAID10
D) 9-disk RAID 5

Question 8

Which are the possible causes for file read/write performance decrease? (Select 3 answers)

A) A slow disk or bad sector exists,
B) The Fibre Channel port has a high bit error rate.
C) The LUN has been set to write back.
D) The prefetch policy does not apply to service data changes.

Question 9

In performance optimization of the N8500 clustered NAS storage systems, which of the following issues must the maintenance personnel be aware of concerning LUNs and controllers? (Select 3 answers)

A) Create only one LUN for each RAID group.
B) Set LUNs to forcible write back without mirroring.
C) Ensure that the owning controller and the working controller of a LUN are the same.
D) Disks that compose a file system are evenly distributed on controllers.

Question 10

When configuring an N8500 clustered NAS engine, a user must specify the start and end physical IP addresses and the start and end virtual IP addresses,

Question 11

Which of the following statements about the VCS services and resources provided by a clustered NAS system are correct? (Select 3 answers)

A) A dependency relationship between service groups can be defined.
B) A dependency relationship between resources can be defined,
C) Each resource corresponds to one agent.
D) Resource dependency relationships can be defined in a cyclic manner.

Question 12

Before installing software for an OceanStor 9000 storage system, you must prepare required tools, cables, and software packages. Which of the following statements about this preparation is incorrect?

A) The SSH client software is required for remote access.
B) An FTP upload tool is required for uploading installation packages to storage nodes.
C) The OceanStor 9000 storage system software is required, which contains the OceanStor SystemReporter suite.
D) A network cable is required for connecting the management PC to the OceanStor 9000 management network port.

Question 13

A NAS storage system is dedicated to storing and managing which of the following data types?

A) Block data
B) File data
C) Object data
D) Consecutive data blocks

Question 14

Which of the following statements about N8500 troubleshooting is incorrect?

A) Check file system configurations, and then check storage device configurations.
B) Check network connection, and then check NAS device configurations.
C) Check device indicators, and then check system logs.
D) Check the status of storage unit disk enclosures, and then check the status of storage unit controller enclosures.

Question 15

The HUAWEI OceanStor 9000 can be managed using web browsers. If an OceanStor 9000 storage system uses default settings, which of the following entered in the browser address box is correct?

A) https://IP:httpsport/webui
B) http://IP:httpsport/tools
C) http://IP:httpsport
D) https;//IP:httpsport

Question 16

The CIFS sharing of the OceanStor 9000 supports local user authentication and AD domain user authentication.

Question 17

Which of the following statements about the InfoQuota feature of the OceanStor 9000 are correct? (Select 3 answers)

A) Quotas can be set based on users,
B) Quotas can be set based on user groups.
C) Quotas can be set for file directories,
D) Quotas can be set for files.

Question 18

The HUAWEI OceanStor Toolkit V100R001 is used for information collection. When importing a service package, you can find the service package in the datacollect folder under toolcases.

Question 19

The flexible space of the OceanStor 9000 is attributed to the scale-out architecture, scalability from 3 to 288 nodes, and support for global namespace.

Question 20

You can use the HUAWEI OceanStor Toolkit to perform the operations such as preventive maintenance, information collection, and upgrade for the HUAWEI OceanStor 9000.

Question 21

Which of the following disks are used by an N8500 clustered NAS engine as system disks?

A) Fibre Channel disks
B) SAS disks
C) SATA disks
D) SSDs

Question 22

If an OceanStor 9000 storage system consists of four M nodes and uses 10GE for the back-end network, how many IP addresses must be planned for the back-end storage network segment?

A) 8
B) 12
C) 6
D) 10

Question 23

Based on full interconnection of data channels and communication channels, a clustered NAS system employs cluster volume management to manage global storage space. Specifically, any nodes in a cluster can access the same storage space using the same volume device name, ensuring access consistency.

Question 24

Which of the following are included in Hadoop? (Select 3 answers)

A) HDFS
B) HBase
C) MapReduce
D) MPP DB

Question 25

In an OceanStor 9000 storage system, hard quotas are set for user A to access the /dir directory. The recommended threshold is 3 GB, the soft threshold is 4 GB, the grace period is 10 days, and the hard threshold is 6 GB. If user A has written 3.1 GB data in the /dir directory, which of the following statements are correct? (Select 2 answers)

A) The system reports an alarm indicating that the threshold is exceeded,
B) User A can continue to write data in the /dir directory.
C) User A can continue to write data in the /dir directory for another 10 days.
D) User A cannot continue to write data in the /dir directory.

Question 26

Which of the following statements about the file system used by the OceanStor 9000 is incorrect?

A) The file system provides a unified file system namespace.
B) The name of the namespace provided by the file system is the same as the system name.
C) The root directory of the namespace does not provide sharing or access.
D) Added capacity can be directly obtained from the storage pool.

Question 27

Which of the following are considered when planning the deployment of an N8000 clustered NAS storage system? (Select 3 answers)

A) Evenly distribute service loads among all cluster nodes. Employ port bonding to increase network bandwidths and enhance protection capability.
B) Plan the types of file systems for the storage system based on the performance and data integrity requirements of customers' environments.
C) Plan various RAID groups for the storage system to address the data integrity and read/write performance requirements of different application scenarios.
D) Select operating systems based on application requirements.

Question 28

A customer has purchased a 4-node N8500 clustered NAS storage system. The enterprise-edition engine nodes have two CPUs, 10GE network ports, and 48 GB cache. The performance of an engine node reaches 700 MB/s. The back-end storage uses the S5600T, which is configured with 80 SAS disks divided into eight 9-disk RAID 5 groups. Each RAID group has one hot spare disk. The performance of each SAS disk in the 9-disk RAID 5 groups is 30 MB/s. According to the preceding information, what is the overall performance of the N8500 without considering other factors?

A) 700 MB/s
B) 2800 MB/s
C) 1920 MB/s
D) 2400 MB/s

Question 29

Compared with traditional RAID algorithms, the Erasure Code redundancy technology provides higher reliability and more flexible redundancy policies. Which of the following statements about Erasure Code is incorrect?

A) Data to be written is divided into multiple data blocks of the same size.
B) The Erasure Code algorithm calculates N parity blocks for every M consecutive data blocks. (The value of N is smaller than that of M.)
C) M+N data blocks are concurrently stored to different nodes.
D) In Erasure Code storage mode, a concurrent failure of N-l disks is tolerated.

Question 30

The stripe file system data of an N8500 clustered NAS storage system is stored on multiple data disks in the same way as data in RAID 0. The stripe file system provides high read/write performance but low security.

Question 31

Scale-out is a horizontal expansion architecture that addresses the needs and challenges caused by rapid data growth and complex data changes. The scale-out architecture features distributed processing, online expansion, data sharing, and clustering.

Question 32

Which of the following statements about the system services of the OceanStor 9000 are correct? (Select 2 answers)

A) The MDS service manages the metadata of a file system.
B) The DS service stores file data but not metadata on the storage system.
C) The CMS service manages physical nodes in a cluster.
D) In an OceanStor 9000 storage system, some nodes provide the MDS service and some nodes provide the DS service.

Question 33

In an N8500 clustered NAS system, the engine enclosures exchange cluster control information over a Fibre Channel heartbeat network.

Question 34

You can check VCS cluster logs by viewing the Engine_A.log file in the /var/VRTSvcs/log directory on an N8500 storage system.

Question 35

A 2-node N8500 clustered NAS engine is a 4 U enclosure. The heartbeat links between the two nodes are set up based on the internal PCIe channels.

Question 36

Multiple users access a multimedia VOD application at different bit rates. Which prefetch policy should be selected for the LUNs on the background N8500 clustered NAS storage system?

A) No prefetch
B) Constant prefetch
C) Intelligent prefetch
D) Variable prefetch

Question 37

Which of the following issues are resolved by big data storage security technology? (Select 3 answers)

A) Integrity
B) Confidentiality
C) Availability
D) Continuity

Question 38

Which of the following statements about the OceanStor Toolkit installation of the OceanStor 9000 is incorrect?

A) The OceanStor Toolkit can be installed on any storage node.
B) The PC used for installation is connected to a storage node through port eth0.
C) The IP address of the network port used to upload the OceanStor Toolkit must be configured on the same network segment as the management network.
D) After the OceanStor Toolkit is successfully installed, enter https://xx.xx.xx.xx:8088/tools in the Internet Explorer address box to go to the login page.

Question 39

In an N8500 system, if an engine node is faulty and the other components are in the normal state, the consequences do not include which of the following?

A) The N8500 cannot be managed.
B) LUNs on the storage units become unavailable.
C) Service performance deteriorates.
D) The NFS file sharing service becomes abnormal.

Question 40

Which command is used to check whether a file system is mounted using the support account for N8500 V200R001?

A) cfsmntadm display
B) cfsmountadm display
C) cfsmntadm show
D) cfsmountadm show

Question 41

Which of the following statements about CIFS are correct? (Select 2 answers)

A) CIFS transmits data based on TCP.
B) CIFS transmits data based on UDP.
C) CIFS is a file sharing protocol used on Linux.
D) CIFS is a file sharing protocol used on Windows.

Question 42

In an N8500 clustered NAS system, at most how many 1 Gbit/s service ports can a single clustered NAS engine node provide?

A) 4
B) 8
C) 12
D) 16

Question 43

Which of the following statements about different service applications' storage performance and capacity requirements are correct?

A) Compared with an email application, an enterprise OLTP/OLAP database requires higher storage performance.
B) Compared with picture and video applications, a large-sized relational database requires a larger storage capacity.
C) Compared with the content delivery network application, the backup and archive services require higher storage performance.
D) Compared with a real-time online service system, scientific computing requires higher storage performance.

Question 44

Which of the following must be considered before you optimize the performance of an N8500 clustered NAS storage system? (Select 3 answers)

A) Evaluate the feasibility of the performance target based on your experience.
B) Use a fixed testing environment for performance optimization.
C) Determine the testing mode based on services to ensure the comparability of the test results.
D) Performance optimization has no impact on ongoing services. You do not need to worry about the pressure on services.

Question 45

Which of the following statements about the high availability daemon (HAD) function of an N8500 clustered NAS system are correct? (Select 3 answers)

A) Each host in the N8500 cluster runs a HAD process.
B) The hastart command can be executed to enable the had and hashadow services to automatically start.
C) HAD is used to monitor and manage the statuses of all services on the clustered NAS system.
D) The clustered system uses hashadow to monitor the HAD process. If HAD becomes abnormal, hashadow can restart HAD.

Question 46

In the IB networking solution of the OceanStor 9000, which of the following statements about the IP address planning of the front-end service network is correct?

A) Two static IP addresses on the front-end service network must be planned for each node.
B) Four dynamic IP addresses on the front-end service network must be allocated to each node for the IP address pool used by the InfoLink function.
C) One InfoLink DNS IP address on the front-end service network must be planned.
D) One floating IP address on the front-end service network must be planned for each node.

Question 47

Compared with a relational database, which of the following are advantages of NoSQL? (Select 3 answers)

A) Flexible scalability
B) High availability
C) High cost-effectiveness
D) Feature richness

Question 48

In the OceanStor 9000, a file pool is a collection of files that have specific characteristics. A file pool policy defines the rules for storing a file pool in a node pool.

Question 49

The fencing function provided by an N8500 prevents split-brain from occurring. Which of the following statements about fencing are correct? (Select 3 answers)

A) Monitors GAB and checks the changes of cluster members.
B) Ensures the single view of cluster members.
C) Prevents multiple nodes from using a volume manger to access the shared storage.
D) Automatically recovers the master node if the cluster becomes abnormal.

Question 50

If an engine node of an N8500 storage system cannot be started, which of the following measures is incorrect?

A) Replace the CPUs.
B) Replace the memory.
C) Replace the Fibre Channel interface cards.
D) Replace the main board.

Question 51

Which of the following statements about the CIFS share are correct? (Select 2 answers)

A) CIFS normal share enables a directory to be accessed by all users.
B) CIFS homedir share enables a directory to be accessed by all users.
C) In Normal mode, a client can access a share through only one VIP.
D) Compared with the Normal mode, the Cluster mode provides higher data reliability but lower performance.

Question 52

Which of the following statements about the application scenarios of different nodes of the HUAWEI OceanStor 9000 big data storage systems is correct?

A) The mini-capacity node applies to small-capacity scenarios.
B) The performance node applies to large-capacity and high-bandwidth scenarios.
C) The capacity node applies to OPS-intensive scenarios.
D) None of the above is correct.

Question 53

A NAS storage system supports file system sharing, and the underlying protocol transmits data based on iSCSI.

Question 54

Which of the following statements about the N8500 configuration prerequisites are correct? (Select 3 answers)

A) The heartbeat network ports of the clustered NAS engine are correctly connected to the heartbeat network.
B) The service network ports of the clustered NAS engine are not connected to the customer's service network before they are configured.
C) The clustered NAS engine is correctly powered on and the statuses of the indicators are normal.
D) Hardware installation and cable connection of the clustered NAS engine are complete.

Question 55

An N8500 clustered NAS engine can be connected to a SAN storage array over a Fibre Channel network and a SAS network concurrently.

Question 56

An OceanStor 9000 storage system uses GE for the front-end network and 10GE for the back- end network. Which of the following statements is incorrect about the ports on the P node as shown in the figure?

A) Ports AO-1 and AO-1 are connected to the 10GE switch. A back-end network IP address must be planned for each of the two ports.
B) Ports B3-0 and B3-1 are connected to the front-end service switch. A front-end network IP address must be planned for each of the two ports.
C) NIC 0 is connected to the management and maintenance switch. You do not need to assign an IP address for this port.
D) Port IPMI is connected to the management and maintenance switch. You do not need to assign an IP address for this port.

Question 57

Which of the following statements about the file system mirroring feature provided by an N8500 clustered NAS system are incorrect? (Select 2 answers)

A) The N8500 supports a maximum of two mirrors for a single file system.
B) Resources of different storage pools can be selected to implement file system mirroring.
C) File system mirroring allows users to select three mirroring layout types.
D) In the same service scenario, mirrored-stripe and striped-mirror provide the same data reliability and performance.

Question 58

Which of the following statements about IP address planning for the N8500 clustered HAS storage systems is incorrect?

A) Each service network port, management network port on an engine node, and management network port on a storage unit must have a physical IP address.
B) Each service network port and management network port on an engine node must have a virtual IP address.
C) Ensure that the physical IP address and virtual IP address of each port reside on the same network segment.
D) It is recommended that the console IP address reside on the same network segment as the service network.

Question 59

In performance optimization of the N8500 clustered NAS storage systems, the top command is runand the following output is displayed: top - 01: 06: 48 up 1: 22, 1 user, load average: 0.06, 0.60, 0.48 Tasks: 29 total, 1 running, 28 sleeping, 0 stopped, 0 zombie Cpu(s): 0.3% us, 1.0% sy, 0.0% ni, 98.7% id, 0.0% wa, 0.0% hi, 0.0% si Mem: 191272k total, 173656k used, 17616k free, 22052k buffers Swap: 192772k total, 0k used, 192772k free, 123988k cached Which of the following statements is incorrect?

A) up 1:22 indicates the current system time.
B) load average indicates the average length of task queues.
C) 0.3% us in Cpu(s) indicates the CPU occupation percentage of user space.
D) 17616k free in Mem indicates the total capacity of free memory.

Question 60

Which of the following statements about the configuration of the file system snapshot feature provided by an N8500 clustered NAS system are incorrect? (Select 2 answers)

A) A file system snapshot can be created manually or automatically.
B) The maximum number of snapshots created for a file system is 256.
C) A snapshot that is automatically created is in online state by default,
D) A snapshot can be automatically removed by the system.