Task 2.3: Describe Azure storage services

• AAzure Blob Storage

  Incorrect

  Blob Storage isn't a file share that users can map as a network drive over SMB.

• BAzure Disk Storage

  Incorrect

  Managed disks are block volumes attached to individual VMs, not shares for many users and servers.

• CAzure Queue Storage

  Incorrect

  Users couldn't map Queue Storage as a network drive, and the Linux servers couldn't mount it, so it can't stand in for the file server.

• DAzure Files

  Correct

  Azure Files offers fully managed file shares over SMB or NFS that cloud and on-premises machines can mount at the same time.

Azure Files provides managed file shares accessible through SMB and NFS. SMB shares are reachable from Windows, Linux and macOS clients and can be mounted concurrently by cloud or on-premises deployments, which makes it the natural replacement for a file server.

• ACold

  Correct

  Cold is an online tier for infrequently accessed data kept at least 90 days, with lower storage cost than cool and no rehydration wait.

• BHot

  Incorrect

  Hot is optimized for frequently accessed data and has the highest storage cost of the four tiers.

• CCool

  Incorrect

  Cool costs more to store than cold, and this data is kept long enough for the colder online tier.

• DArchive

  Incorrect

  Archive is an offline tier, so a file couldn't be read straight away when an auditor asks, and it suits data kept at least 180 days.

Choose the coldest tier that still meets access and retention needs. About four months clears cold's 90-day minimum but not archive's 180 days, and archive data is offline. Cold therefore stores this data most cheaply while keeping it immediately readable.

• AZone-redundant storage (ZRS)

  Correct

  ZRS copies data synchronously across three availability zones in the primary region and stays available for reads and writes if one zone fails.

• BLocally redundant storage (LRS)

  Incorrect

  LRS keeps its three copies in a single datacenter, so a zone-wide failure can take all of them offline.

• CGeo-redundant storage (GRS)

  Incorrect

  GRS copies data to a secondary region, which breaks the single-region requirement.

• DGeo-zone-redundant storage (GZRS)

  Incorrect

  Like GRS, GZRS copies data to a secondary region, which the compliance rule doesn't allow.

LRS keeps all of its copies in one datacenter. ZRS spreads copies across three zones in the primary region, keeping data available through a zone outage, and Microsoft recommends it where replication must stay within a country or region. GRS and GZRS add a second region.

• AAzure Storage Explorer

  Incorrect

  Storage Explorer is a graphical app for managing files and blobs, not a tool to call from a nightly script.

• BAzCopy

  Correct

  AzCopy is a command-line utility that copies and synchronizes blobs or files in one direction, from a source to a destination.

• CAzure File Sync

  Incorrect

  File Sync works with Azure Files shares, not blob containers.

• DAzure Data Box

  Incorrect

  Data Box isn't a command-line copy tool that a script can run every night.

AzCopy uploads, downloads and copies blobs or files and can synchronize them, always one way from source to destination, which makes it the tool to call from a nightly script.

• ACopy the files over the internet with AzCopy

  Incorrect

  At 100 Mbps, 300 TB would take the better part of a year even if the link were free for the copy.

• BRun an assessment and migration in Azure Migrate

  Incorrect

  Azure Migrate still moves data over the network, so it doesn't get around the 100 Mbps link.

• COrder Azure Data Box devices and ship the data

  Correct

  Data Box ships rugged storage devices that are filled locally and returned to Microsoft for upload, made for tens of terabytes or more over limited bandwidth.

• DSync the archive to Azure Files with Azure File Sync

  Incorrect

  File Sync still sends data over the same network link, so the 300 TB would take just as long to arrive.

Azure Data Box is a physical migration service for moving large amounts of data quickly when network bandwidth is limited. You copy data to the device on site and ship it back, and Microsoft uploads it to your storage account.

• AAzure Table Storage

  Incorrect

  Table Storage isn't built to serve large media files to browsers.

• BAzure Blob Storage

  Correct

  Blob Storage is object storage for large amounts of unstructured data, ideal for serving images and streaming video to browsers.

• CAzure Queue Storage

  Incorrect

  Queue Storage isn't a store for files that browsers download.

• DAzure Disk Storage

  Incorrect

  Managed disks are block volumes attached to VMs, not objects served to browsers.

Azure Blob Storage is an object store for unstructured text or binary data such as media, logs and backups. Objects are reachable over HTTP or HTTPS from anywhere, which suits serving images and streaming video and audio.

• ALocally redundant storage (LRS)

  Correct

  LRS keeps three copies in one datacenter, protecting against drive and rack failures at the lowest cost.

• BZone-redundant storage (ZRS)

  Incorrect

  ZRS costs more than LRS for protection these regenerable files don't need.

• CGeo-redundant storage (GRS)

  Incorrect

  GRS adds more protection and cost than the team needs.

• DRead-access geo-zone-redundant storage (RA-GZRS)

  Incorrect

  RA-GZRS is the most resilient option and among the most expensive.

Azure Storage always keeps three copies in the primary region. LRS keeps all three in a single datacenter: it's the lowest-cost option and covers drive and rack failures, but a disaster affecting the datacenter can lose the data, which is acceptable for files that can be rebuilt.

• ARetrieval that takes hours instead of milliseconds

  Incorrect

  Cool is an online tier: data is available immediately, with the same retrieval latency as the hot tier.

• BLower durability, because the cool tier keeps fewer copies

  Incorrect

  Data in the cool tier has the same high durability as in the hot tier.

• CLoss of zone-redundant replication for those photos

  Incorrect

  The hot, cool and cold tiers support every redundancy configuration, so moving to cool doesn't change the account's replication.

• DA lower availability commitment than the hot tier has

  Correct

  Cool and cold data have slightly lower availability: the SLA for cool is 99%, against 99.9% for hot.

The cool and cold tiers trade a little availability and higher access costs for lower storage costs. They keep the hot tier's durability, retrieval latency and throughput, and they support every redundancy option.

• AAzure Arc

  Incorrect

  Azure Arc isn't a migration hub for discovering and assessing a datacenter.

• BAzure Site Recovery

  Incorrect

  Site Recovery replicates machines for disaster recovery rather than assessing a datacenter for migration.

• CAzure Migrate

  Correct

  Azure Migrate is a hub for discovery, assessment and migration of servers, databases and web apps to Azure.

• DAzure Data Box

  Incorrect

  Data Box doesn't discover or assess servers, and it doesn't track a migration.

Azure Migrate is a unified migration platform: a single portal to start, run and track a migration, with tools such as Discovery and assessment and Server Migration, integration with other Azure services and with independent software vendor tools.