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If you're using HDDs to provide storage capacity, you must use storage bus caching. When using persistent memory devices as cache devices, you must use NVMe or SSD capacity devices (you can't use HDDs). Persistent memory devices are used in block storage mode. Same number and types of drives in every server – see Drive symmetry considerations. Solid-state drives must provide power-loss protection. 512n, 512e, and 4K native drives are all supported. SATA, SAS, persistent memory, and NVMe (M.2, U.2, and Add-In-Card) drives are all supported. For more help choosing drives, see the Choosing drives and Understand and deploy persistent memory articles. Storage Spaces Direct works with direct-attached SATA, SAS, NVMe, or persistent memory (PMem) drives that are physically attached to just one server each. It's required that every node has a direct connection with every other node of the cluster. Switchless: Nodes can be interconnected using direct connections, avoiding using a switch. If using RDMA that implements the RoCE protocol, network device and switch configuration is even more important. Switched: Network switches must be properly configured to handle the bandwidth and networking type. Switched or switchless node interconnects NICs that are remote-direct memory access (RDMA) capable, iWARP (recommended) or RoCE. Recommended interconnect for high performance, at scale, or deployments of 4+ Two or more network connections from each node recommended for redundancy and performance. 10 Gbps network interface card (NIC), or faster. Minimum interconnect for small scale 2-3 node Storage Spaces Direct requires a reliable high bandwidth, low latency network connection between each node. RAID 1 mirror is not required, but is supported for boot. #STACK THE STATES 2 CONN ENT WINDOWS#
Any boot device supported by Windows Server, which now includes SATADOM. 4 GB of RAM per terabyte (TB) of cache drive capacity on each server, for Storage Spaces Direct metadata. #STACK THE STATES 2 CONN ENT PLUS#
Memory for Windows Server, VMs, and other apps or workloads plus. 
Intel Nehalem or later compatible processor or.Recommended that all servers be the same manufacturer and model.Minimum of 2 servers, maximum of 16 servers.In addition, the following requirements apply: Servers The fully configured cluster (servers, networking, and storage) must pass all cluster validation tests per the wizard in Failover Cluster Manager or with the Test-Cluster cmdlet in PowerShell.
There are over 1,000 components with the SDDC AQs. In addition, we recommend that servers and network adapters have the Software-Defined Data Center (SDDC) Standard and/or Software-Defined Data Center (SDDC) Premium additional qualifications (AQs), as pictured below.
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Systems, components, devices, and drivers must be certified for the operating system you’re using in the Windows Server Catalog. Want to evaluate Storage Spaces Direct but don't have hardware? Use Hyper-V or Azure virtual machines as described in Using Storage Spaces Direct in guest virtual machine clusters.
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