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Pearson MCSA 70-740 Installation, Storage , and compute with Windows Server 2016 > Chapter 6 - Data Deduplication > Flashcards

Chapter 6 - Data Deduplication Flashcards

1
Q

Name three scenarios that would be ideal for data deduplication.

A

General-purpose file servers
VDI deployments
backup targets

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2
Q

What data deduplication policy specifies that files should be considered for data
deduplication?

A

Optimization policy

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3
Q

What two fields in Get-DedupStatus are relevant to the optimization rate?

A

OptimizedFilesSavingsRate and SavingsRate

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4
Q

What is a Chunk?

A

A part of a file that Data Deduplication selected by the chunking algorithm as likely to occur in other, similar files

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5
Q

What is a Chunk Store?

A

An organized series of container files in the System Volume Information folder that DDPEval uses to uniquely store chunks

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6
Q

What is Dedup?

A

An abbreviation for data deduplication that is commonly used in PowerShell, Windows Server APIs and components, and the Windows Server community

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7
Q

What is File Metadata?

A

Information that describes properties about the file that are not related to the main content of the file

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8
Q

What is File Stream?

A

The main content of the file

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9
Q

What is a File system?

A

The software and on-disk data structure that the operating system uses
to store files on storage media

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10
Q

What is a File System Filter?

A

A plugin that modifies the default behavior of the file system

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11
Q

What is Optimization?

A

The process of chunking a file and storing its unique chunks in the chunk store

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12
Q

What is Optimization Policy?

A

A policy which specifies the files that should be considered for data deduplication

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13
Q

What is Reparse Point?

A

A special tag that notifies the file system to pass off I/O to a specified file system filter; in data deduplication, it is the way optimized files are stored (pointers to a chunk map)

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14
Q

What is Volume?

A

A Windows construct for a logical storage drive that may span multiple physical storage devices across one or more servers

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15
Q

What is Workload?

A

An application that runs on Windows Server

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16
Q

What are some usage scenarios for data deduplication?

A

User documents: 30% to 50%
Deployment shares: 70% to 80%
Virtualization libraries: 80% to 95%
General file shares: 50% to 60%

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17
Q

How does data deduplication help in general file servers?

A

There will be plenty of opportunity for data deduplication to work its magic in these environments—often consisting of team shares, user home folders, work folders, and software development shares.

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18
Q

How does data deduplication help in Virtualized Desktop Infrastructure (VDI) deployments?

A

Many virtual hard disks are practically identical.

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19
Q

How does data deduplication help with backup targets?

A

So much of the data we store as backups is identical to other data we have backed up!

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20
Q

What is DDPEval?

A

Data Deduplication Savings Evaluation tool can evaluate the potential for optimization against directly connected volumes and mapped or unmapped network shares.

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21
Q

Can data deduplication affect performance negatively?

A

data deduplication is a periodic task that could interrupt the performance requirements of your workload. This is of most concern for workloads stored in traditional HDDs as opposed to SSDs.

22
Q

What are the resource requirements of the workload?

A

Storage that has “downtime,” such as weekends, is often an excellent candidate for data deduplication since this processing can occur during those times.

23
Q

How does Windows Server 2016 enhance data deduplication in four ways?

A

Support for larger volumes
Support for larger files
Support for Nano Server
Simplified backup support

24
Q

How does Windows Server 2016 enhance support for data deduplication in larger volumes?

A

Server 2016 now supports volume sizes up to 64 TB.

25
Q

How does Windows Server 2016 enhance support for data deduplication in larger files?

A

Files up to 1 TB are fully supported

26
Q

How does Windows Server 2016 enhance data deduplication in backup support?

A

A new default usage type now supports seamless deployment of data deduplication for virtualized backup applications.

27
Q

What are the Three types of Data Deduplication?

A

Default
Hyper-V
Backup

28
Q

What is the default type of data deduplication used for?

A

This is the option to choose for general-purpose file servers. It uses Background optimization.

29
Q

What is the optimization policy for the default type of data deduplication?

A

Minimum file age = 3 days
Optimize in-use files = No
Optimize partial files = No

30
Q

What is the Hyper-V type of data deduplication used for?

A

This is deduplication tuned specifically for VDI servers.. It uses Background Optimization and has “under the hood tweaks” for Hyper-V interoperability

31
Q

What is the optimization policy for the Hyper-V type of data deduplication?

A

Minimum file age = 3 days
Optimize in-use files = Yes
Optimize partial files = Yes

32
Q

What is the Backup type of data deduplication?

A

This is tuning for virtualized backup applications. It has priority optimization and “Under-the-hood” tweaks for interop with DPM/DPM-like solutions

33
Q

What is the optimization policy for the backup type of data deduplication?

A

Minimum file age = 0 days
Optimize in-use files = Yes
Optimize partial files = No

34
Q

What four jobs make data deduplication possible?

A

Optimization
Garbage Collection
Integrity Scrubbing
Unoptimization

35
Q

What is Garbage Collection?

A

Reclaims disk space by removing unnecessary chunks that are no longer being referenced by files that have been recently modified or deleted

36
Q

What is Integrity Scrubbing?

A

Identifies corruption in the chunk store due to disk failures or bad sectors

37
Q

What is Unoptimization?

A

Undoes the optimization done by deduplication and disables data deduplication for that volume

38
Q

How do you add the role of data deduplication in PowerShell?

A

Install-WindowsFeature -Name FS-Data-Deduplication

39
Q

How do you add the role of data deduplication in Nano Server?

A

Install-WindowsFeature -ComputerName -Name FS-Data-Deduplicatio

40
Q

What are five cmdlets used to implement data deduplication in PowerShell?

A 
Enable-DedupVolume
Start-DedupJob
Stop-DedupJob
Get-DedupJob
Start-DedupJob
41
Q

What does the Enable-DedupjobVolume cmdlet do?

A

Enables data deduplication on one or more volumes.

42
Q

What does the Start-DedupJob cmdlet do?

A

Starts a new data deduplication job

43
Q

What does the Stop-DedupJob cmdlet do?

A

Stops a data deduplication job that’s already in progress (or removes it from the queue)

44
Q

What does the Get-DedupJob cmdlet do?

A

Shows all the active and queued data deduplication jobs

45
Q

What does the Start-DedupJob cmdlet do?

A

To disable date deduplication

46
Q

What cmdlet is useful for Powershell data deduplication monitoring?

A

Get-DedupStatus

47
Q

Which Fields are important in the Get-DedupStatus cmdlet for data deduplication monitoring?

A 
LastOptimizationResult
LastGarbageCollectionResult
LastScrubbingResult
OptimizedFilesSavingsRate
SavingsRate
48
Q

How do you interpret the monitoring of the LastOptimizationResult field in data deduplication monitoring?

A

(0 = success), LastOptimizationResultMessage, and LastOptimizationTime (should be recent)

49
Q

How do you interpret the monitoring of the LastGarbageCollectionResult in data deduplication monitoring?

A

0 = success), LastGarbageCollectionResultMessage, and LastGarbageCollectionTime (should be

50
Q

How do you interpret the monitoring of the LastOptimizationResult field in data deduplication monitoring?

A

(0 = success), LastScrubbingResultMessage, and LastScrubbingTime (should be recent)

51
Q

How do you interpret OptimizedFilesSavingsRate in data deduplication monitoring?

A

applies only to the files that are “in-policy” for optimization (space used by optimized files after optimization/logical size of optimized files)

52
Q

How do you interpret SavingsRate in data deduplication monitoring?

A

applies to the entire volume (space used by optimized files after optimization/total logical size of the optimization)

Pearson MCSA 70-740 Installation, Storage , and compute with Windows Server 2016 (28 decks)

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