I have setup always on between 2 stand alone SQL servers, Automatic failover(Synchronous) in which 2 instances have WSFC enabled .
what are the possible causes does always on failover?
Possibilities i am aware of
1.Disk filled out
2.restart of instance/server
3.upgrade or patch failed and cant connect to sql server
4.Network cable pulled out
like above what are other possible scenarios does always on failover?