Storage

Question 1

What is the purpose of an OS disk?

Answer 1

Holds the OS related files.

Question 2

What is the maximum size of an OS disk?

Answer 2

2048 GB

Question 3

What is the purpose of a Data disk?

Answer 3

Holds general application and user data.

Question 4

What is the maximum size of a Data disk?

Answer 4

32,767 GB

Question 5

What is a Temp disk?

Answer 5

Short-term storage in each VM which is local to the server, not attached to a Storage Account.

Question 6

Where do Ephemeral disks save their data?

Answer 6

It is saved local to the VM rather than to remote storage.

Question 7

Is data held in Ephemeral disks free?

Answer 7

Yes. Because data is saved locally to the VM, it is free..

Question 8

In what form are Managed Disks kept in Storage Accounts?

Answer 8

They are kept as page blobs.

Question 9

What’s the maximum amount of Managed Disks per Subscription?

Answer 9

50k

Question 10

What are the two types of encryption methods associated with Managed Disks?

Answer 10

Azure Storage Service Encryption (SSE) as part of the storage account or Azure Disk Encryption (ADE) which uses BitLocker or DM-Crypt depending on the VM’s OS.

Question 11

What command would you use to convert an Unmanaged Disk to an Managed one?

Answer 11

ConvertTo-AzureRMVMManagedDisk -ResourceGroupName MyGroup -VMName JC-DC

Question 12

Where can Ultra SSDs be used?

Answer 12

Only with VMs in Availability Zones.

Question 13

What are some limitations of Ultra SSDs?

Answer 13

Data disk only, no snapshots, VM images, scale sets, recovery, encryption or backup.

Question 14

What is Azure Files?

Answer 14

A cloud-based file share.

Question 15

How can you access Azure File Shares?

Answer 15

Either mounting the share locally in Windows Explorer, using Azure File Sync or in the Azure Portal.

Question 16

What would you use between Azure Files or Azure Files Sync for an on-prem service?

Answer 16

Azure File Sync works better for on-prem services whereas Azure Files is more suited to services running in Azure.

Question 17

Where are Azure Files kept?

Answer 17

Within a storage account.

Question 18

What’s the difference between standard and premium performance with Azure Files?

Answer 18

Standard uses HDDs with 300Mbps bandwidth whereas Premium uses SSDs with 5Gbps bandwidth.

Question 19

What are some file migration command-line tools?

Answer 19

AzCopy in Azure CLI or Robocopy.

Question 20

What are some file migration methods?

Answer 20

AzCopy, Robocopy, Azure Storage Explorer, Azure Import, Azure File Sync or Azure Data Boxes.

Question 21

How do you connect to Azure Files Shares via SMB?

Answer 21

Within the File Share on Azure, there’s a connect option. Paste the PowerShell code into the shell to mount the share locally.

Question 22

What do I use to connect to an Azure share with permissions set the traditional way?

Answer 22

Use Azure File Sync as this supports DACLs.

Question 23

How does Locally Redundant Storage (LRS) work?

Answer 23

Creates 3 copies of each file within the same region.

Question 24

How does Geo-Redundant Storage (GRS) work?

Answer 24

Creates 3 copies of each file within a region, then creates an additional 3 copies in a secondary region.

Question 25

When can you get read-access to files in secondary regions when using GRS?

Answer 25

You can have read-access when the primary region is down.

Question 26

How does Zone Redundant Storage (ZRS) work?

Answer 26

Put data into 3 clusters within a single region, each cluster is kept in different physical locations.

Question 27

What happens with ZRS if a datacenter goes down?

Answer 27

ZRS keeps data in different physical locations therefore you should still have access if one datacenter goes down.

Question 28

What if the region does down and I'm using ZRS?

Answer 28

You won't have access to your data.

Question 29

How does Geo-Zone Redundancy Storage (GZRS) work?

Answer 29

This takes ZRS but replicates the 3 data clusters to a secondary region which will have copies of those clusters.

Question 30

When can you get read-access to files in secondary regions when using GZRS?

Answer 30

You have read-access, even if the primary region isn't down.

Question 31

What are Paired Regions for storage?

Answer 31

Where two regions are paired to protect against regional outages.

Question 32

How would you modify the replication model for a storage account in PowerShell?

Answer 32

Use the Set-AzStorageAccount cmdlet then use the -SkuName parameter to define the replication model.

Question 33

How would you modify the replication model for a storage account in the Azure Portal?

Answer 33

Under Configuration within the Storage Account.

Question 34

Storage has failed over to the secondary site when using GRS, what replication model will be used after the failover process?

Answer 34

With the primary site being down, you will be using LSR with the secondary site acting as the primary.

Question 35

Storage had failed over, how is everything put back to how it was?

Answer 35

Set your replication model back to what it was from LSR.

Question 36

How do you understand how much data was lost during a failover?

Answer 36

Check the Last Sync Time.