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Hi Todd, I've done a bit of testing with a two node 11g R2 RAC environment running on Windows 2008 R2. It appears to work the same as Linux when using the multi-writer flag correctly. However if you're planning to implement on vSphere 5.0 it would pay not to use the VMXNET3 NIC at this stage as there are a few bugs that may impact stability and connectivity if using large pages when using it on Windows (which you might normally implement for the interconnect private network). VMXNET2 or E1000 still work fine, although no large pages with E1000. It's only a problem with updated vSphere 5 version of VMware Tools. KB 2006277 explains the situation. It's expected to be fixed in 5.0 U1. Otherwise happy testing.
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