We have two servers each one occupied by a dedicated storage. I am looking for the a way to setup these two servers to provide a database on MS SQL Server with automatic fail-over support.
Using Database Mirroring seems to be ineffective for automatic fail-over when only two servers are available.
More info on why: For automatic fail-over, Database Mirroring needs a third element called witness to coordinate Principal/Mirror roles between two DB instances and assist switching during fail-over. However, I only have two servers available so I am forced to install witness on one of the servers that can be either Primary (Principal) or Secondary (Mirror) DB instance. So when a hardware failure occurs on the server that both principal DB and witness are running, the mirror DB cannot become online and automatic fail-over doesn’t happen.
A recent feature of SQL Server called Always On Availability Groups seems to provide the similar functionality for mirroring plus more. Can automatic fail-over be achieved using Always On Availability Groups having only two servers?
Do you have any other recommendation for having automatic fail-over support, particularly against power failures, by two servers?
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