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AZ-104 - Jake C > Storage > Flashcards

Storage Flashcards

1
Q

What is the purpose of an OS disk?

A

Holds the OS related files.

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2
Q

What is the maximum size of an OS disk?

A

2048 GB

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3
Q

What is the purpose of a Data disk?

A

Holds general application and user data.

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4
Q

What is the maximum size of a Data disk?

A

32,767 GB

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5
Q

What is a Temp disk?

A

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

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6
Q

Where do Ephemeral disks save their data?

A

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

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7
Q

Is data held in Ephemeral disks free?

A

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

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8
Q

In what form are Managed Disks kept in Storage Accounts?

A

They are kept as page blobs.

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9
Q

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

A

50k

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10
Q

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

A

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.

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11
Q

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

A

ConvertTo-AzureRMVMManagedDisk -ResourceGroupName MyGroup -VMName JC-DC

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12
Q

Where can Ultra SSDs be used?

A

Only with VMs in Availability Zones.

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13
Q

What are some limitations of Ultra SSDs?

A

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

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14
Q

What is Azure Files?

A

A cloud-based file share.

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15
Q

How can you access Azure File Shares?

A

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

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16
Q

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

A

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

17
Q

Where are Azure Files kept?

A

Within a storage account.

18
Q

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

A

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

19
Q

What are some file migration command-line tools?

A

AzCopy in Azure CLI or Robocopy.

20
Q

What are some file migration methods?

A

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

21
Q

How do you connect to Azure Files Shares via SMB?

A

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

22
Q

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

A

Use Azure File Sync as this supports DACLs.

23
Q

How does Locally Redundant Storage (LRS) work?

A

Creates 3 copies of each file within the same region.

24
Q

How does Geo-Redundant Storage (GRS) work?

A

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

25
Q

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

A

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

26
Q

How does Zone Redundant Storage (ZRS) work?

A

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

27
Q

What happens with ZRS if a datacenter goes down?

A

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

28
Q

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

A

You won’t have access to your data.

29
Q

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

A

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

30
Q

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

A

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

31
Q

What are Paired Regions for storage?

A

Where two regions are paired to protect against regional outages.

32
Q

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

A

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

33
Q

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

A

Under Configuration within the Storage Account.

34
Q

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

A

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

35
Q

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

A

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

36
Q

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

A

Check the Last Sync Time.

AZ-104 - Jake C (5 decks)

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