Microsoft announced on Monday a significant improvement to their Service Level Agreements in respect of a single instance Virtual Machine in Azure – now offering 99.9% availability!
Many organisations with legacy line of business applications are nervous about moving those workloads to the Cloud owing to the SLA provided by the cloud vendor. Often those legacy applications are unable to take advantage of scale-out features and therefore reside on a single instance server, which in turn suffers from relatively poor SLA commitments.
Microsoft have done extensive work to improve availability of the Azure infrastructure, including innovative machine-learning to predict failing hardware early and offering premium storage to help improve reliability and performance of attached disks – the net effect of this work is that they can now offer single instance virtual machines in Azure with 99.9% availability, allowing organisations to take advantage of the agility of the cloud without compromising on their expectations of availability.
To qualify for the single instance virtual machine SLA, all storage disks attached to the VM must use Azure Premium Storage which offers both high availability and performance (80,000 IOPS and 2,000 MBps throughput).
To put that SLA into context that’s less than 9 hours per year downtime – there are very few organisations capable of running their own infrastructure with single instance line of business applications that can provide that level of availability.
Of course, if your legacy line of business applications do support scale-out then you can continue to build multi-machine high availability by having two or more virtual machines deployed in the same Availability Set or by utilising VM Scale Sets – both of which provide machine isolation, network isolation, and power unit isolation across multiple virtual machines.
If you want to know more about how you can migrate applications and workloads safely, securely and efficiently to Azure then please feel free to contact us here at CoreAzure.