In this post we talked for two of the options offered to users for Availability. Levels for each Service as described in this SLA, then you may be eligible for a credit towards a portion of your monthly service fees. If Microsoft does not achieve and maintain the Service This Service Level Agreement for Microsoft Online Services (this “SLA”) is a part of your Microsoft volume licensing agreement (the “Agreement”). 99.99%, 2 or more VMs into Availability Zone.99.95%, 2 or more VMs in an Availability Set.Protect from Hardware failures within data centersīelow are the SLA's for the Azure Virtual Machines. Note that for 99.99% SLA, you must deploy at least two virtual machines into at least two different zones.ĭifferences between Availability Set and Availability ZoneĪt the table below we can see the two main differences between Availability Set, Zone Your managed disk and, if you have one, your public IP will be deployed into the same Select the Availability Zone for the Virtual Machines using the Availability Zone drop-down. VirtualMachines Standard_DS 1 westeurope 1 NotAvailableForSubscription MaxResourceVolumeMB 7168Ĭonfiguring an Availability Zone is very easy, especially from the Azure Portal. We can check what SKUs are supported with the following command: Zone-redundant services (Automatic replication across zones is enabled for SQL Database, zone-redundant storage)Īt the image below we can see a scenario with three Availability Zones on the same region.Īvailability Zones don't support all VM sizes.Zonal Services (Add the resource to a specific zone, for example VMs, Managed Disks, IP Addresses ).There are two categories of Availability Zones: It can be deployed using one or more Virtual Machines in an Azure Region.
This is the next level of Azure Virtual Machines high-availability, because Virtual Machines are in different physical locations within an Azure Region.
We can't add an existing Virtual Machine to an Availability Set.Īt the image below we can see the Availability Set option on Azure Portal. We can configure an Availability Set ONLY when we deploy a New Virtual Machine, This configuration offers 99.95% SLA.īehind the scenes an availability set is a kind of clustering with not sync between VMs, it just try to keep the VMs up and running.Īt the image below we can see a basic scenario of two Web Servers and two Database Servers. This article provides you with an overview ofĪ group with two or more virtual machines in the same Data Center is called Availability Set, this ensures that at least one of the virtual machines hosted on Azure will be available if something happens. Azure offers SLA-graded availability solutions for Virtual Machines by hosting them in multiple data centers around the world. Availability is the annual percentage rate that a system is functional and working.
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