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Storage Flashcards

1
Q

3 storage account options are:

A

GPv1, GPv2, Blob

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2
Q

Three tiers for Blob storage

A

Hot, Cool, Archive

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3
Q

Maximum number of storage accounts per subscription

A

200

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4
Q

For most scenarios, Microsoft recommends: GPv2 or Blob?

A

GPv2

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5
Q

Two performance tiers for storage

A

Premium, Standard

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6
Q

Type of disk for Standard performance tier

A

Magnetic (HDD)

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7
Q

Type of disk for Premium performance tier

A

SSD

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8
Q

Can you switch between Standard and Premium performance tiers?

A

No

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9
Q

What is the only usage for the Premium performance tier?

A

Azure VMs

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10
Q

Is there any storage data that is not replicated?

A

No - data is always replicated at least three times

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11
Q

What are the four replication options for a storage account?

A

Locally Redundant Storage (LRS), Zone-Redundant Storage (ZRS), Geo-Redundant Storage (GRS), Read Access Geo-Redundant Storage (RA-GRS)

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12
Q

Which type of replication option cannot be altered to another type?

A

ZRS

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13
Q

How many times is LRS replicated, and where?

A

3 times within a single facility in a single region

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14
Q

How many times is ZRS replicated, and where?

A

3 times across two or three facilities, in either one or two regions

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15
Q

How many times is GRS replicated, and where?

A

3 times in primary region and 3 times in second region

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16
Q

What is difference between RA-GRS and GRS?

A

RA-GRS provides read access to your data in the second region

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17
Q

What is AzCopy?

A

Command-line utility to copy files to and from Blob, Table and File storage

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18
Q

What are common parameters of AzCopy?

A

/Source: /Dest: /SourceKey: /DestKey: /SourceSAS: /DestSAS: /Pattern:

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19
Q

For which type of container is AzCopy case-sensitive?

A

Blob

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20
Q

What replication scheme is the default?

A

RA-GRS

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21
Q

Aside from user credentials, what are the two options to manage storage resources in a different Azure subscription?

A

Account name and key, Shared access signature

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22
Q

Virtual machines have at least how many disks?

A

two - OS and temporary disks

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23
Q

On a Windows VM, the OS drive is registered as what type of disk and on what drive letter?

A

SATA and C:\

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24
Q

The temporary disk on a Windows VM is used for storing what (specifically) and under what drive letter by default?

A

pagefile.sys and d:\

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25
Q

What storage is used for Data disks on a VM?

A

They are persisted as a blob in an Azure Storage Acct

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26
Q

What determines the size of the temporary disk and the number of disks you can attach to a VM?

A

The size you choose for the VM

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27
Q

What is the max IOPS per storage account for standard storage?

A

50,000

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28
Q

What is the maximum number of disks per storage account for standard storage?

A

100

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29
Q

What is the maximum IOPS for premium storage for a storage account?

A

unlimited

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30
Q

What is the maximum number of disks per storage account for premium storage

A

unlimited

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31
Q

What is the total disk capacity and maximum number of disks at max capacity for a storage account with premium storage?

A

35 TB total, 35 disks

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32
Q

What is the max bandwidth for a storage account with premium storage?

A

50 Gbps

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33
Q

What is the total snapshot capacity for premium storage in a storage account?

A

10 TB

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34
Q

What is the difference between using a managed and unmanaged disk for a VM?

A

Disks that are unmanaged must explicitly define a separate storage account.

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35
Q

When using premium disk for a VM, do you have access to the underlying storage account?

A

No

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36
Q

True or false - you can upload a VHD file and attach it to an existing VM in Azure?

A

true

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37
Q

When detaching a managed disk from a VM, does it impact the underlying disk object?

A

No. It is the equivalent of unplugging the hard drive from the computer.

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38
Q

When converting an unmanaged disk to a managed disk for a VM, what is the potential issue with performing the process?

A

You must power off the VM

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39
Q

File storage uses what protocol?

A

SMB 3.0

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40
Q

What command would you use to map a file share on your Windows VM?

A

net use

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41
Q

The quota on a file share could also be referred to as what?

A

Size

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42
Q

If you have a mapped or mounted file share, what action will likely break the mount?

A

Rotating or changing the access key for the file share. The access key is the password used to connect.

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43
Q

To mount a file share in Linux, what must be true of your Linux machine?

A

It must be running in Azure in the same region as the file share.

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44
Q

What is the maximum size for a file share?

A

5 TB

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45
Q

What two series of VMs support premium storage?

A

DS and FS

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46
Q

True or false - the file share quota cannot be changed after creation

A

False - you can change the size (quota) of the file share

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47
Q

What drive type is used for new data disks for a VM?

A

SCSI

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48
Q

What are the three main types of blobs?

A

Block blobs, Append blobs, Page blobs

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49
Q

Which blob type is the best choice for a large number of IOT sensors / devices writing data to a blob, but not needing to read data from it?

A

Append blob

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50
Q

Which type of blob would be most useful as the persistence for a VHD?

A

Page blob

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51
Q

What are the three types of access for a blob service, and which is the default?

A

Private (default), Blob, Container

52
Q

Can a blob storage account use Premium performance?

A

No - only standard

53
Q

True or false: you can use Powershell to upload or download a VHD file

A

True - Add-AzureRmVHD, Save-AzureRmVHD

54
Q

What is the name of the service by which you can ship a physical hard drive to Azure instead of uploading the data?

A

Azure Import/Export service

55
Q

Which type of blob is optimized for sequential I/O?

A

Block blobs

56
Q

Which type of blob is most cost effective?

A

Block blob

57
Q

What is the maximum size for a single queue message in Queue Storage?

58
Q

What is the upper bound in overall size of a queue?

A

The amount of space available in the storage account

59
Q

How long can a message remain on a queue?

60
Q

What is the maximum number of properties an entry in table storage can have?

61
Q

True or false - PrimaryKey is a required entry for an Azure table entry

62
Q

What are the required fields for an Azure table entry?

A

PartitionKey, Timestamp, RowKey

63
Q

What is the name of the service that will automatically encrypt a storage account?

A

Storage Service Encryption (SSE)

64
Q

What is a URI that grants restricted access rights to Azure Storage resources?

A

Shared Access Signature (SAS)

65
Q

What are two types of Shared Access Signatures?

A

Ad Hoc and Policy

66
Q

If I want to allow a user to read and delete from a specific type of storage, would I use a storage key or a shared access signature?

A

Shared Access Signature allows discrete access to individual resources

67
Q

When creating a Recovery Services vault, what is the default replication?

A

Geo-redundant

68
Q

Is Azure Site Recovery heterogeneous or homogeneous and why?

A

Heterogeneous because it supports multiple types of servers / VMs such as Hyper-V, VMWare and physical servers

69
Q

True or false: Azure Site Recovery cannot be used to assist with a surge in demand on your existing site

A

False - Site Recovery is able to help deal with traffic surges and extend capacity

70
Q

True or false: Azure Site Recovery can monitor and facilitate failover for two on-prem data centers

71
Q

Storage Analytics metrics are available for what four types of storage objects? Which of these four does NOT have Storage Analytics logging available?

A

metrics - blobs, files, tables, queues

logging is not supported for files

72
Q

Are write operations performed by Storage Analytics billable?

73
Q

What is the maximum retention policy for Storage Analytics?

A 
explicitly defined - 365 days
implicitly defined (0 days) - indefinite
74
Q

What is the default retention policy for Storage Analytics?

A

0 days (meaning, indefinite)

75
Q

Can your Azure Backup be recovered if you lose the passphrase?

76
Q

The software you install locally to backup files to Azure as part of Azure Backup is called what?

A

Azure Backup Agent

77
Q

When you create a storage account, Azure creates ___ storage keys, each of them being ___ bits

78
Q

If you believe your storage account key to have been compromised, what should you do?

A

regenerate it

79
Q

By default, a new storage account is created in which access tier?

80
Q

What are the two primary considerations when estimating the cost of a blob GPv2 storage account?

A

How much data will be stored, and how will you normally access that data?

81
Q

LRS is designed to provide how many “9s” in durability?

A

11 9s (99.999999999)

82
Q

A write request to LRS storage only returns successfully after what is true?

A

Only after the data has been written to all replicas

83
Q

What is a storage scale unit?

A

A collection of racks of storage nodes

84
Q

What is a Fault Domain in the context of LRS?

A

A group of nodes representing a physical unit of failure and can be considered to belong to the same physical rack

85
Q

What is an Upgrade Domain in the context of LRS?

A

A group of nodes that are upgraded together during the process of a service upgrade (rollout)

86
Q

If a datacenter-level disaster occurs, which type of storage may lose all replicas?

87
Q

ZRS offers how many “9s” in durability?

A

12 9s (99.9999999999)

88
Q

GRS offers how many “9s” in durability?

A

16 9s (99.99999999999999)

89
Q

When you enable RA-GRS, your data is available on a secondary endpoint. How does the URL change to access that secondary endpoint?

A

Add “-secondary” to the account name

90
Q

True or false - when using RA-GRS, your application must manage the endpoint it is interacting with

A

True - because there is a “-secondary” endpoint available

91
Q

When using RA-GRS, if you want to know whether your data has been fully replicated yet, what should you check?

A

Last Sync Time

92
Q

Under what circumstance would you obtain read and write access to your secondary region with RA-GRS?

A

After completion of a Microsoft-initiated failover to the secondary region

93
Q

What is the SLA on GRS?

A

There is none currently

94
Q

What is the RPO for GRS?

A

Typically under 15 minutes, but there is no SLA

95
Q

Are you able to choose the secondary region for GRS?

A

No - it is determined automatically based on the primary region you choose

96
Q

Which storage tier cannot be set at the account level and must be set on a blob?

97
Q

GPv1 accounts do or do not support tiering (Hot, Cool, Archive)?

A

They do not

98
Q

As compared hot storage tier, cool storage has ____ storage costs and _____ access costs

A

Lower storage cost, Higher access cost

99
Q

If you have media content that is not viewed frequently, but is expected to be available immediately, which storage tier is appropriate?

100
Q

Historical medical images would be a good candidate for which storage tier?

101
Q

You are gathering large scientific data sets. If you break up your data-gathering process into accumulation and processing, when should you use hot and cool storage tiers?

A

Accumulation and stage for processing in hot storage, storage of the data after processing (which gathering more) in cool storage

102
Q

Archive data is intended for data that can tolerate ____ ____ of retrieval latency and will remain in the archive tier for at least ____ days

A

several hours of latency, 180 days

103
Q

What must you do to read data in archive storage, what is the process called and how long can it take to complete?

A

You must change the tier of the blob to hot or cool, the process is called rehydration and it can take up to 15 hours to complete

104
Q

What should you check to see if your rehydration of archive tier data is complete?

A

Archive Status - it will read “rehydrate-pending-to-hot” or “rehydrate-pending-to-cool” and will be removed entirely upon completion

105
Q

What operation do you use to change the storage tier for an individual blob?

A

Set Blob Tier

106
Q

What property would you check to see if a blob storage tier is inferred from the storage account?

A

Access Tier Inferred

107
Q

When a blob is moved to a warmer storage tier, how is the operation billed?

A

As a read from the source (cooler) tier

108
Q

When a blob is moved to a cooler storage tier, how is the operation billed?

A

As a write against the destination (cooler) tier

109
Q

You will be charged an early deletion fee if you delete it or move to a warmer tier prior to ___ days in the cool tier and ___ days in the archive tier. Is the fee prorated?

A

30 (cool), 180 (archive), yes it is prorated

110
Q

Azure Storage events are pushed / published through what?

A

Azure Event Grid

111
Q

True or false: asynchronous file uploads are a great fit for events

112
Q

You can identify a blob storage event because the event type start with what?

A

Microsoft.Storage

113
Q

What is the maximum request rate per storage account?

A

20,000 req / sec

114
Q

Maximum number of blocks in a block blob or append blob

115
Q

Max size of a block in a block blob

116
Q

Max size of a block in an append blob

117
Q

Max size of a page blob

118
Q

Max number of stored access policies per blob container or file share

119
Q

Maximum size of a file in a file share

120
Q

Target throughput for a single file share

A

up to 60 MiB

121
Q

File Share - Max open handles per file

122
Q

File Share - Maximum number of open snapshots

123
Q

Page blobs are made up of ___ byte pages, up to a total size of ___

A

512 byte pages up to a total of 8 TB

124
Q

What type of strength and algorithm is used for Azure Storage encryption?

A

256 bit AES

125
Q

True or false: You can disable Storage Service Encryption

A

False - it is applied to all new and existing storage accounts and cannot be disabled

126
Q

If you’re creating a custom domain name for a blob storage account, and you have an SLA and want to avoid downtime, what method should you use?

A

Intermediary mapping with asverify (instead of direct CNAME mapping)

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