HCNA Storage вопросы/ответы

Question/answers Huawei HCNA Storage BCCP H13-612 из разных источников (mock, вопросы honorcup и с сайта Huawei) единым списком для удобства подготовки. Это не dumps, а те дампы, которые есть, они не имеют отношения к текущему HCNA Storage – то что я видел были для старого Storage.

Что такое Big Data?

– Новый маркетинговый ход

– Новый подход к хранению и обработке данных

– Конкретный класс продуктов

Все ответы являются правильными

What are the main differences between traditional data and big data?

Количество данных и возможность анализа неструктурированных данных

Name main reasons why we now have so much data that needs to be collected.

- взрывной рост технологий, как обработки/хранения/передачи, так и появление форматов с высоким разрешением видео/фото
- бизнес и обычные клиенты все более полагаются на цифровые данные

(True or False) Many companies gather so much data but still they are able to extract the right information from the data.

F

What is the difference between structured and unstructured data?

В неструктуированных данных нет структуры (лол), удобной для извлечения информации из данных типа SQL/таблиц

E-mails are example of unstructured data.

T

Which of the following is not the advantage of object storage?
A.Object interface, dividing data flexibly
B.External SCSI or file interfaces
C.Flat objects, allowing easy access and expansion
D.Improved data integrity and security

B

Which is the distributed file system of Hadoop?
A.HDFS
B.Hbase
C.MapReduce
D.MPP-DB

A

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

1. HDFS
2. HBase
3. MapReduce
4. MPP DB

ABC

What is NOT a characteristic of the Erasure code?
A.Uses a RAID 2.0+ like technology to store the parts on multiple disks.
B.Main technology used to prevent file loss.
C.Parts of the files can be spread over multiple OceanStor 9000 nodes.
D.With OceanStor 9000, files are chopped in 4 MB parts.

D

What is NOT a characteristic of the Erasure code?
A.Uses a RAID 2.0+ like technology to store the parts on multiple disks.
B.Main technology used to prevent file loss.
C.Parts of the files can be spread over multiple OceanStor 9000 nodes.
D.With OceanStor 9000, files are chopped in 4 MB parts.

D

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

1. Flexible scalability
2. High availability
3. High cost-effectiveness
4. Feature richness

D

Which of the following does not demonstrate the characteristics of big data?

1. Analysis of the popularity of China railway lines during the Spring Festival travel rush in
2. Analysis and forecast of global influenza with the use of search engines
3. Analysis of final exam scores of a university student
4. Data recording and analysis of a Chinese moon landing project

C

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

1. How to implement quick data searches for higher retrieval efficiency
2. How to ensure data authenticity and prevent data cheating
3. How to implement PB-level storage of various data
4. How to save storage resources by reducing the data amount

AC; PB-PetaByte

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

1. Integrity
2. Confidentiality
3. Availability
4. Continuity

ABC

Describe the concepts of Hadoop and OBS.

Hadoop – набор инструментов для работы с big data.
OBS – неиерархическое объектное хранилище.

Big Data solutions are primarily used to store what type of data?

1. Mostly structured data
2. Mostly unstructured data
3. Both structured data and unstructured data
4. None of the above

C

Which of the following methods provides the best RTO?
A.Disk-To-Tape
B.Disk-To-Disk-To-Tape
C.Virtual Tape Library
D.Replication

D

What are the categories of deduplication technology?

- По месту исполнения
- По моменту времени
- По объекту дедупликации
- По масштабу

By granularity, deduplication can be divided into

1. File-level deduplication
2. Block-level deduplication
3. Byte-level deduplication
4. Deduplication at source end

ABC

How many backup topologies are available? What are their advantages and disadvantages?

См. lan-based, lan-free

Common backup media include

1. Tape library
2. Disk array
3. VTL
4. CD-ROM tower/library

ABCD

Which of the following statements about LAN-Free backup are correct?
A.Backup data flows do not consume LAN resources.
B.Backup performance is improved compared to LAN-Base backups.
C.The backup agent does not affect the performance of application servers.
D.Network performance is not affected.

ABD

Depending on the amount of data to be backed up, which of the types is not the actual backup method?
A.Incremental backup
B.Full backup
C.Real-time backup
D.Differential backup

C

Put the following Backup methods in the right order. Cheapest hardware solution first, most expensive hardware solution last.
A.Tape, CD/DVD, Virtual Tape Library, Solid State Disk
B.CD/DVD, Tape, Virtual Tape Library, Solid State Disk
C.Tape, CD/DVD, Solid State Disk, Virtual Tape Library
D.CD/DVD, Solid State Disk, Tape, Virtual Tape Library

A

(True or False) Incremental backup requires the last full backup and each incremental backup to fully restore data. Data reconstruction is therefore slower compared with full backups.

T

Statement 1: The retention period determines how many times per day a backup must be made.
Statement 2: Incremental backups do not require a lot of time to complete.
A.Statement 1 and 2 are true.
B.Statement 1 is true; Statement 2 is false.
C.Statement 1 is false; Statement 2 is true.
D.Statement 1 and 2 are false.

С

What is NAS?

Network Attached Storage – подключенное к сети Ethernet хранилище

What is share?

Общая директория для группы/всех

What are scenarios where NFS and CIFS can be applied?

В сценариях необходимости работы с файлами на удаленных машинах. CIFS в Windows, NFS в Linux.

Which of the following is not the function of a NAS device?
A.Provides interfaces to share files.
B.Provides interfaces to connect storage systems.
C.Provides a hardware platform to run NAS software.
D.Provides a large block storage space.

D

Which of the following are NAS components?

1. Storage
2. Network
3. Engine
4. Server

ABD

Statement 1: NAS solutions are always file based.
Statement 2: NAS solutions are mostly limited in distance because Ethernet cables are used.
A.Statement 1 and 2 are true.
B.Statement 1 is true; Statement 2 is false.
C.Statement 1 is false; Statement 2 is true.
D.Statement 1 and 2 are false.

A

Fill in the blanks. In a ____ infrastructure multiple clients are connected over an ______ based network with the centralized storage device.
A.NAS, Ethernet.
B.DAS, SCSI.
C.NAS, iSCSI.
D.SAN, Ethernet.

A

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

1. CIFS transmits data based on TCP.
2. CIFS transmits data based on UDP.
3. CIFS is a file sharing protocol used on Linux.
4. CIFS is a file sharing protocol used on Windows.

AD

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

1. Block data
2. File data
3. Object data
4. Consecutive data blocks

B

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

F

Which of the RAID levels DOES NOT provide redundancy?

RAID 0

Failure of any two disks in a RAID 10 group does not affect data access (T/F).

False

Is the one-to-one and one-to-many relationships between RAID and LUNs (T/F)?

True

Дан набор жёстких дисков: один диск 2 TB, два – по 1.5 TB и один – 4 TB. Из набора требуется собрать массив уровня RAID10. Какова будет максимальная емкость массива?

3 TB (1,5*4/2)

Имеем RAID массив уровня 5, состоящий из 3-х дисков. В одном stripe на двух дисках содержится информация 00000000 и 11110000. Восстановите потерянную информацию для данного stripe на третьем диске.

00000000

11110000

--

11110000

Для защиты от потери данных кэша RAID контроллера (сервера/системы хранения) в случае сбоя электропитания используется

+ в качестве физического носителя для кэш RAID контроллера используются энергонезависимая память, на хранение данных в которых не влияют сбои в питании.
- два RAID контроллера, работающих в паре
+ ионистр и Flash модуль для выгрузки кэша RAID контроллера на время сбоя
- встроенный батарейный блок для питания RAID контроллера на время сбоя

Which of the following statements about RAID are False?
A.Software RAID is not supported with Huawei.
B.Hardware RAID 3 is supported with Huawei.
C.RAID 5 has a 1 disk capacity space penalty.
D.RAID 6 performs just as fast as RAID 5.
E.In both RAID 10 and RAID 6 it is possible to loose two disks without data loss.
F.Rebuild times force IT administrators not to use RAID 6 anymore.

ADE

Which of the following statements about RAID 5 are not correct?
A.RAID 5 has fixed parity disks.
B.RAID 5 uses the XOR algorithm for parity.
C.RAID 5 writes data by stripes.
D.RAID 5 tolerates the failure of a maximum of two member disks without losing data.

AD

Which of the following statements about RAID 10 is false?
A.RAID 10 applies to scenarios with demanding requirements for speed and fault tolerance.
B.RAID 10 requires at least four member disks.
C.In RAID 10, if two member disks in the RAID 1 group fail, data read proceeds normally.
D.Data is mirrored and then striped in RAID 10.

C

Which of the following statements are correct?
A.A RAID group is like a physical volume that consists of multiple disks.
B.One logical volume can be created on a physical volume.
C.Multiple logical volumes can be created on a physical volume.
D.A LUN can reside on multiple RAID groups.

ABC

Which of the following statements are correct?
A.A logical volume can reside on multiple physical disks. Data storage can be physically discontinuous.
B.A volume group is built on physical volumes. A volume group can contain one physical volume group or multiple physical volumes.
C.Multiple volume groups can be created on the space of a logical volume.
D.Physical volumes reside on the lowest layer in the logical volume manager. Logical volumes and volume groups are dependent on physical volumes.

ABD

Which of the following is the correct procedure for configuring a HUAWEI OceanStor V3 storage system?
A.Creating a LUN -> Adding a mapping -> Creating a Storage pool.
B.Creating a Storage pool -> Adding a mapping -> Creating a LUN.
C.Creating a LUN -> Creating a Storage pool -> Adding a mapping.
D.Creating a Storage pool -> Creating a LUN -> Adding a mapping.

D

In the same case of IO environment and disk type, which of the following description of RAID5/RAID10 Performance Comparison is wrong?

1. Space utilization: Raid5 is obviously better than Raid10
2. Security: Raid5 is lower than Raid10
3. When read the business which belongs to large files, the performance of Raid5 is obviously better than Raid10
4. When read the business belongs to the Radom small IO, Raid5 is the best choice

D

Which of the following opinions are correct? (Select 2 answers)
A. In the process of disk array creating RAID group, it suggest that configure hot spare is the best.
B. as long as the type of disk is the same as the RAID group member, which can do hot spare disk of RAID group
C. reasonably choose different rotating speed of disk as the same RAID group can effectively improve the performance of the RAID group
D. the same disk array can be configured in multiple hot spare disks

AD

Which of the following RAID levels provide redundancy?
RAID 0
RAID 1
RAID 5
RAID 10

BCD

Rebuilding a global hot spare disk is faster than rebuilding dedicated hot spare disk (T/F).

F

If a customer is concerned with reliability and performance, what RAID schemes will you recommend?

RAID 10
RAID 2.0+

Explain the differences between the application scenarios of RAID 5 and those of RAID 1.

RAID 5 - не очень важные данные в большом количестве (файловые/почтовые сервера)
RAID 1 - важные данные (БД, critical business app) в небольшом количестве (размер данных не превышает размер одного диска) 

Explain the basic principles of RAID 5.

Для защиты данных массива используется логическая операция XOR. Защита от отказа одного диска.

Discribe the various states a RAID group can be in.

создание массива
работа массива
реконструкция массива - отказал диск, есть hot spare и данные уже переносятся на него
деградация массива - отказал диск (или несколько, но не больше чем позволяет RAID), но нет hot spare
авария массива - слишком много дисков отказало

Explain the difference between stripe unit and stripe width.

Stripe unit или chunk size - минимальная единица данных записываемая на один диск, перед записью на другой диск.
Stripe width/depth (ширина ленты) - суммарная емкость секторов на одной ленте: количество данных в chunk одного stripe * количество дисков под данные в RAID.

Describe the difference between a LUN and an NTFS volume.

LUN - неформатированный жестких диск, без файловой системы.
NTFS volume - раздел, отформатированный NTFS (раздел может быть поверх реального жесткого диска или LUN)

Block virtualization

Extent основывается на chunk, размер меньше или равен размеру chunk (64мб)

Какойиз этапов процесса создания LUN с использованием технологии RAID2.0+ задает уровни отказоустойчивости и производительности?

Объединение чанков в группы (формирование CKg)

Which of the following statements about block virtualization technology for Huawei storage systems are incorrect?
A.A RAID group is formed in the unit of physical disks.
B.Data is distributed to all disks, fully leveraging the read/write processing capability of a storage system.
C.A CKG is the unit used in applying for space, releasing space, and relocating data.
D.Data reconstruction efficiency improves significantly.

AС

Which is the correct formation order of the following elements in RAID 2.0+?
A.LUN -> CK -> CKG -> Extent -> LD
B.LD -> CK -> CKG -> Extent -> LUN
C.LD -> CKG -> CK -> Extent -> LUN
D.LD -> Extent -> CKG -> CK -> LUN

B

Link bandwidth of Storage array remote replication data transmission is not adjusted. True False

F

What is the difference between traditional RAID and Huawei’s RAID 2.0+?
За счет более грамотной архитектуры (полагается не на диски напрямую, а на логические блоки):

- распределение нагрузки чтения
- распределение нагрузки восстановления на hot spare
- не нужно следить за дисками горячей замены

What are the three tiers the OceanStor models supports?

high-perfomance tier
perfomance tier
capacity tier

What is hot spare space used for?

Для восстановления данных, в RAID 2.0+ hot spare пространство распределенно равномерно по всем дискам домена.

What is the difference between an Extent and a Grain?

extent 512кб до 64мб используются thich lun
grain 64кб используются thin lun

List the five convergence levels that OceanStor v3 offers.

SAS & NAS
HIGH-END & MID-RANGE & ENTRY-LEVEL
SSD & HDD
PRIMARY & BACKUP STORAGE
HETEROGENEOUS convergence

RAID 2.0+ offers better protection against data loss than traditional RAID but it performs a little bit slower ( T/F)

F

To rebuild a RAID 2.0+ protected failed drive takes a lot of time as all drives are involved in the rebuild of the spare disk (T/F)

F

Explain the difference between a snapshot and a clone.

Clone занимает весь объем, отведенный под LUN
Snapshot занимает только пространство отведенное под ненулевые данные LUN, а не весь объем

What two methods can be used to restore data using a snapshot?

side-by-side recovery: создается сопоставление snapshot LUN для хоста, который "видит" оригинальный LUN. В результате конкретные данные могут быть скопированы на уровне ОС.
rollback function: оригинальный LUN (и все его данные) просто подменяется snapshot LUN.

How much storage capacity is consumed when a Thin LUN of 500 GB is created?

64MB

Name the three stages of the SmartTier process.

1) I/O monitoring
2) Data placement analysis
3) Data relocation

Describe what is meant with synchronous replication.

При записи хоста на основной СХД хост не получит подтверждение успешности записи пока основной СХД не получит подтверждение от СХД, с которым происходит репликация.

Which of the licensed features can be described as: the, almost instant, creation of a full copy of an active LUN without ipmacting the access to the active LUN?

1. HyperSnap
2. HyperMirror
3. HyperClone
4. HyperReplication

C

Which of the following statements about the SmartTier feature is true?

1. Saves space in the disk domain.
2. Lowers the cost of storing aged data.
3. Data relocating data is a heavy burden on the system and should only be executed in quiet time of the system.
4. SmarTier needs all three tiers to be filled with disks.
5. SmarTier works on individual LUNs.

BE

Huawei OceanStor V3 series storage system hardware includes controller enclosures and disk enclosures. Which of the following statements about controller enclosures are correct?
A.A controller enclosure consists of controller modules, fan, BBU modules, power modules and/or interface modules.
B.A controller enclosure does not have disks. Disks are installed in disk enclosures.
C.A controller enclosure is the core of a storage system.
D.A controller enclosure processes storage services and manages the disk enclosures connected to it.

ACD

Which of the following statements about the expansion modules in a controller or a disk enclosure of a storage device are incorrect?
A.The expansion modules in a disk enclosure enable communication between the disk enclosure and a controller enclosure or another disk enclosure.
B.The disk expansion modules in a controller include a PRI expansion module and an EXP expansion module.
C.Expansion port PRI must connect to expansion port EXP.
D.Huawei storage devices typically use Fibre Channel ports as expansion ports.

BD

What is true about the characteristics of the HUAWEI OceanStor V3 hardware?
A.Up to 8 controllers can be working together.
B.Data coffer feature implemented in all OceanStor models.
C.Controller CPU’s have been updated and cache is upgraded.
D.All of the answers are true.

D

What is required to add additional controllers to an existing  HUAWEI OceanStor V3 system?
A.Smart I/O card
B.SAS cabling
C.56 Gb Infiniband module
D.FC or iSCSI Host Bus Adapter

A

In HUAWEI OceanStor V3, here are 2 statements:
Statement 1: A reboot of the controller is always needed during a firmware upgrade.
Statement 2: All applications must be stopped when firmware is upgraded online.
A.Statement 1 and 2 are true.
B.Statement 1 is true; Statement 2 is false.
C.Statement 1 is false; Statement 2 is true.
D.Statement 1 and 2 are false.

B

Which of the following is the correct procedure for configuring a HUAWEI OceanStor V3 storage system?
A.Creating a LUN -> Adding a mapping -> Creating a Storage pool.
B.Creating a Storage pool -> Adding a mapping -> Creating a LUN.
C.Creating a LUN -> Creating a Storage pool -> Adding a mapping.
D.Creating a Storage pool -> Creating a LUN -> Adding a mapping.

D

Which of the following OceanStor models are available as generation v3.

1. OS 2600
2. OS 5300
3. OS 6600
4. OS 6800
5. OS 9000

BD

Which of the following tasks are MANDATORY tasks in the process of mapping a LUN to a host.

1. Create Disk Domain
2. Create Storage Pool
3. Create Lun Group
4. Create Host
5. Create Host Group
6. Create Port Group
7. Create Mapping View

ABCDEG

What are two reasons to create multiple disk domains within an OceanStor device?

Изоляция ресурсов (производительности, емкости, tiering) - LUN создается внутри Storage Pool, а Storage Pool создается внутри Disk Domain. Следовательно LUN может получать емкость/производительность из физических дисков внутри только своего Disk Domain.

Разделение носителей по группам на основе типа и размера - в дисковых доменах будут разные диски по стоимости и производительности.

There are hundred disks put in one single Disk Domain. Just one LUN is created. Statement 1: splitting the disk domain up into two 50 disk disk domains does impact the performance of the LUN (T/F).
Statement 2: initializing the file system as GPT is required for volumes bigger than 2TB (T/F).

T,T

When would you put multiple LUNs into a single LUN group?

Для применения общих политик для группы LUN - mappings, snapshots, replication. Применяя политику к группе она будет применена ко всем LUN в этой группе.

What is the reason to use a Port Group?

Port group - объединение нескольких физических портов хоста в группу. Необязательная настройка. Может использоваться для определения портов, которые будут использоваться для обмена данными с определенным LUN.

Which of the following description of DAS is wrong?
A.A storage device connects to a host using the SCSI-based bus architecture.
B.DAS is unfavorable to storage resource sharing.
C.The host CPU has a work load when storing data.
D.Long-distance transmission is supported between a host and a storage device.

D

Which are the limitations of DAS, compared with SAN?
A.Poor scalability
B.Difficult resource sharing
C.Large investment
D.Decentralized management

ABD

A DAS solution is also referred to as an Island of Storage (T/F).

T

What are the main port types of fibre channel switches?

+F_Port
N_Port
+E_Port
+G_Port

Dual-switch networking is widely applied in Fibre Channel SANs. Which of the following is not belonging to its characteristics?
A.Two Fibre Channel switches are deployed in a SAN for connecting to the two controllers of a storage device.
B.Per host two fibre channel ports should be available. The two Fibre Channel ports connect to two Fibre Channel switches.
C.The ports on the two Fibre Channel switches connecting to the hosts and storage device must reside in the same zone.
D.As multiple paths exist, the dual switch networking mode supports link redundancy but does not support load balancing.

D

What methods can be used to define zoning in a FC switch?

Port/hard zoning
Wwn/soft zoning + alias zoning

Statement 1: Alias zoning is a user friendly version of soft zoning.
Statement 2: Port zoning is preferred for zoning a FC switch when there are a lot of changes to the patch points.
A.Statement 1 and 2 are true
B.Statement 1 is true; Statement 2 is false
C.Statement 1 is false; Statement 2 is true
D.Statement 1 and 2 are false

B

Which of the following are port types defined by Fibre Channel?
A.E-Port
B.F-Port
C.NL-Port
D.G-Port

ABD

Which of the following are port types defined by Fibre Channel ((switch))?
A.E-Port
B.F-Port
C.NL-Port
D.G-Port

ABD

Which of the following items are mandatory in a Fibre Channel SAN?
A.Storage device
B.Fibre Channel switch
C.Fibre Channel HBA
D.Windows operating system

AC

(True or False) All FC devices with more than 1 interface port but only have one  World Wide Name.

F

Which of these are common vendors of Fibre Channel Host Bus Adapters.
A.Brocade
B.Cisco
C.Emulex
D.Qlogic

ACD

Which are the advantages of the optical switching topology relative to point-to-point and the arbitration ring? (Select 3 Answers)

1. Multiple points can communicate at the same time
2. each node failure is independent, single node failure will not affect the other nodes
3. devices share the bandwidth
4. support multiple transmission rate at the same time

ABC

Because of differences in the operating system itself, each of multi-path software has different compatible versions under the different operating systems, and even different versions of the same operating system, may have different multipath versions, so before installing the multipath software, need to query version supporting table, confirm the compatibility between multipath and OS, HBA carD. True False

T

What is a transeiver?

expansion module (sfp/xfp/etc) в разное оборудование (switch, router, server, storage array, etc) с функцией преобразования оптического сигнала в электрический и наоборот

A host can be part of multiple zones in a FC switch (T/F).

T

E_Ports are FC ports in a host that connects to a switch (T/F).

F

Every interface in a FC switch has a unique WWPN assigned to it. The switch chassis itself has a unique WWNN (T/F).

T

Which of the following characteristics are applicable to FC SANs.

1. Lossless protocol
2. Single fabric
3. IQN zoning
4. Up to 16.77 million devices
5. Speeds up to 10 Gbs/
6. Design should include SPOF’s

AD

- WWN (World Wide Name)

TRUE

F

ABC

ABD

T

T

T

AB

ADEF

infiniband

False

ABC

D

Underlying network protocol, equipment. speed, distance, cost, etc.

Storage array
Server with iSCSI HBA/NIC+Initiator
Ethernet switch
Cables+connectors

initiator - источник, кладет SCSI команды в iSCSI для транспорта по сети TCP/IP в сторону target
target - получатель, кладет SCSI команды в iSCSI для транспорта по сети TCP/IP в сторону initiator, master в обмене

F

T

Стек протоколов TCP/IP не задействован в данном сигнальном обмене