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what scenarios does always on failover

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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?




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