] limited number of cluster nodes. ] SQL instance in a limited number of cluster. ] no failure protection - if the disk array fails, disaster recovery does not occur. ] Use disaster recovery cluster, not at the database level or the database object level, such as tables, create a disaster recovery cluster. Virtual machines can also participate in the cluster, the virtual and physical machines can be clustered together, not a problem. SQL Server instance to a virtual machine, but performance may be good enough impact, depending on the resources consumed by an instance. In the virtual machine before installing SQL Server instance, you need to conduct stress tests to verify whether it can withstand the necessary load. In this flexible architecture, if the virtual machine and physical machine clusters together, you can between virtual machines and physical machines on the SQL Server for load balancing. For example, the use of virtual machine instances of SQL Server development and application. Then you need to conduct stress tests on the development instance, when it more disaster recovery to the cluster of physical machines.
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