Azure – Creating virtual machine (VM) – discussing Availability options – when to use which option

Hi All,

Greetings for the day!!!

Today discussing “Availability options” for virtual machine

Details

• When we create an Virtual Machine – VM, we have asked an option for “Availability options” as shown in below fig

What are Availability options

• Options provided by Azure to maintain the high availability of our application
• Options provided by Azure to manage the resiliency for our application
• What is resiliency
  • Resiliency is the ability of a system to recover from failures and continue to function.
• Following are options available as on today
  • No infrastructure redundancy required
  • Availability zone
  • Virtual machine scale set
  • Availability set

• No Infrastructure Redundancy required : Single VM in the selected region. No copy of VM is maintained
• Availability zone
  • An Availability Zone is a physically separate zone / locations, within an Azure region.
  • There are three Availability Zones per supported Azure region.
  • Each Availability zone contains one or more datacenters
  • We can protect our application and data from loss of datacenters
  • Each Availability Zone has a distinct power source, network, and cooling
  • Using zones for our VMs means protecting our apps and data from the loss of data center
  • If one zone is compromised or have an issue , then apps and data from another zone is immediately available
  • Azure availability zones are connected by a high-performance network with a round-trip latency of less than 2ms
  • They help our data stay synchronized and accessible when things go wrong
  • Here COST is applicable for transferring data in between Zones – requires to synchronize our applications or data
  • Availability zones also provides protection from Calamities
  • Microsoft offers the industry’s best 99.99% VM uptime SLA for Availability Zone.
• Virtual machine scale set
  • Azure virtual machine scale sets allows us to create and manage a group of load balanced VMs.
  • As per our application demand, the number of VM instances can automatically increase or decrease
  • This provides high availability to our application
  • Also allows centrally manage / configure / update our VMs
• Availability sets
  • Protect again failures within data center
  • VM replica will be created in fault domain
  • We dont have COST associated with data transfer
  • We always have same zone.
  • Availability Set is considered over Availability Zone when Cost is factor as there is no data transfer cost

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