To create a reliable infrastructure, adding your virtual machines to an Availability Set is key. There are several scenarios that can have an impact on the availability of your Azure Virtual Machines. These are as follows:
- Unplanned hardware maintenance event: When hardware is about to fail, Azure fires an unplanned hardware maintenance event. Live migration technology is used, which predicts the failure and then moves the VM, the network connections, memory, and storage to different physical machines without disconnecting the client. When your VM is moved, the performance is reduced for a short time because the VM is paused for 30 seconds. Network connections, memory, and open files are still preserved.
- Unexpected downtime ...
