This is not really a storage feature per-se, but I am including it in this series of vSphere 5.1 storage enhancements simply because most of the work to support this 5 node Microsoft cluster framework was done in the storage layer. Although most of the framework was in place since vSphere 4.0 (support for SCSI-3, LSI SAS Controller in the Virtual Hardware, support for PGRs), a number of additional improvements were required before we could scale out to supporting 5 nodes instead of the 2 nodes we supported in the past. I also need to call out that this is…