File Share Witness
https://www.altaro.com/hyper-v/file-share-witness-hyper-v-cluster/
https://www.tech-coffee.net/understand-failover-cluster-quorum/
https://s3.amazonaws.com/quickstart-reference/microsoft/sql/latest/doc/Microsoft_WSFC_and_SQL_AlwaysOn_Quick_Start.pdf
https://d1.awsstatic.com/whitepapers/RDS/Deploying_SQLServer_on_AWS.pdf
https://s3.amazonaws.com/quickstart-reference/microsoft/sql/latest/doc/Microsoft_WSFC_and_SQL_AlwaysOn_Quick_Start.pdf