Availability Zones

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Time
3 hours 51 minutes
Difficulty
Beginner
CEU/CPE
4
Video Transcription
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>> Let's talk about how Azure
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provides redundancy within a region.
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If you look closely at the map,
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you'll see that some regions have
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a diamond inside and the legend
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says that those regions have availability zones.
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Some examples are West US 2,
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Central US and East US.
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But what are availability zones.
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Availability zones are physical,
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separate datacenters within an Azure region.
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Unlike region pairs that are required to
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be at least 300 miles apart,
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availability zones are in a closer proximity and are
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connected through a private
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high-speed fiber-optic network.
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Each availability zone consists
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of one or more datacenters
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equipped with independent power, cooling and networking.
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Similarly to the region pairs,
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if one zone goes down,
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the other continues working.
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Availability zones are important for
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core infrastructure services like Virtual Machines,
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managed disks, IP addresses,
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load balancers, or SQL databases.
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You can architect your application for
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higher availability by co-locating
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your compute storage, networking,
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and data resources within a single availability zone
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and duplicating the same resources into another zone.
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But be aware that there could be a cost tied
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to duplicating your resources in multiple zones.
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There are two categories of
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resources that support availability zones.
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Some zonal resources are VMs like Managed Disks or
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IP addresses where you specify
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the availability zone at the resource creation.
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There are also other zone redundant services
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like storage and SQL databases,
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where the platform automatically replicates across zones.
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Everything we've discussed so far in
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this module allows us to
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build a highly available and performant applications.
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This brings us to service level agreements,
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which we will discuss in the next video.
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