Achieve highest SLA for virtual machines behind the basic load balancers

Suwarna S Kale 3,391 Reputation points
2023-08-10T17:13:37.7666667+00:00

I am looking to achieve 99.99% SLA for a pair of virtual appliance, so I am using availability zones to deploy the machines. Now we wanted to use basic load balancer in front of these machines, does that affects to our SLA?

How we can still able to achieve highest SLA (99.99%) for those virtual appliances running behind the basic load balancers?

Azure Virtual Machines
Azure Virtual Machines
An Azure service that is used to provision Windows and Linux virtual machines.
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Accepted answer
  1. TP 126.3K Reputation points Volunteer Moderator
    2023-08-10T17:17:56.16+00:00

    Hi Suwarna,

    Basic SKU load balancer does not support Availability Zones. You will need to use Standard SKU if you need that.

    Azure Load Balancer SKUs

    https://learn.microsoft.com/en-us/azure/load-balancer/skus#skus

    Please see article below for more information regarding using load balancer with availability zones:

    Load Balancer and Availability Zones

    https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-standard-availability-zones

    Please click Accept Answer if the above was useful.

    Thanks.

    -TP


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  1. dashanan13 930 Reputation points
    2023-08-12T09:04:23.5266667+00:00

    Hei @Suwarna S Kale

    Thank you for reaching out to Microsoft Community.

    As i understand, you have an appliance that you are running with the help of virtual machines and you need it to have 99.99% availability.

    You suggested that you are using "Azure VMs with Availability Zones" and that is good for a disaster recovery scenario but i am not convinced if it is what you need for a load balanced solution.

    I suggest you should try "Virtual machine scale set" (and combine it with availability zones too, if needed), it matches your user case.
    Azure Virtual Machine Scale Sets let you create and manage a group of load balanced VMs.
    Virtual Machine Scale Sets guarantee up to 99.99 percent service-level agreements (SLAs) for your VMs.

    PS: if you still want to work with the current setup here is the guide to Upgrade from a basic public to standard public load balancer

    Please mark it as "answer" if it helped.

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