Supported Windows releases It is supported with Windows Failover Clustering on Windows Server 2016 & 2019 Datacenter OS versions.
Windows release recommendation It is recommended to use Windows Server 2019 Datacenter due to a number of key enhancements in WSFC on WS 2019, including:
Windows 2019 Failover Cluster is Azure aware.
There is added integration and awareness of Azure Host Maintenance, and improved experience by monitoring for schedule events.
For the cluster virtual IP address, it is possible to use (default option) Distributed network name, where cluster network name (virtual hostname) use any cluster node local IP address. This is the same approach that Windows Scale Out File Server is using. In this way there is no need to have a dedicated IP address for cluster network name, and there is no need to configure this IP address on the Azure Internal Load Balancer. Therefore, overall management is easier.
Supported with heterogeneous Linux clustering You can use this solution for achieving high availability of the SAP ASCS/SCS even when using SAP HANA or any DB as the database layer, even if the database layer is running on Linux.
Important: When deploying SAP ASCS/SCS Windows Failover cluster with Azure shared disk, be aware that your deployment will be operating with a single shared disk in one storage cluster. Your SAP ASCS/SCS instance would be impacted, in case of issues with the storage cluster, where the Azure shared disk is deployed.
The documentation above covers a manual procedure to deploy and prepare the infrastructure for the SAP ASCS/SCS using Azure Shared Disks.
With this Azure ARM Template , you can automate the infrastructure preparation for a single SAP SID with ERS1. The Azure ARM template will create two Windows Server 2019 or 2016 VMs, the Windows OS will be added to an existing Windows Active Directory domain, a shared disk will be created, attached to the VMs, and formatted with a drive letter; Azure Availability Set and Proximity Placement Group will be created and VMs will be added; Azure Internal Load Balancer will be created and configured; Azure cloud witness as a majority maker is created and configured etc.
Azure shared disks are discussed in SAP on Azure - Video Podcast #8 - The One with the Azure Shared Disks: