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Storage Spaces Direct (S2D)

How to change the Cluster Network without downtime in a 2 nodes direct connect
How to change the Cluster Network (plug in the wrong slot RDMA2 instead of RDMA3) without downtime in a 2 nodes direct connection  Go to network Conne...
Fri, Sep 11, 2020 at 2:56 PM
Understanding the Azure Local / Storage Spaces Direct storage stack: how a write reaches the disk
TL;DR: An application write in a VM on Azure Local traverses ten or more layers — guest filesystem, VHDX, CSV, ReFS, Storage Spaces, the Storage Bus Layer o...
Tue, May 26, 2026 at 10:24 AM
Testing RDMA performance between Azure Local / S2D nodes with MlxNdPerf
TL;DR: MlxNdPerf is the NVIDIA/Mellanox utility that measures RDMA Read/Write/Send bandwidth and latency between two endpoints. Run it server-side on one no...
Tue, May 26, 2026 at 3:53 PM
Rebooting a cluster node without VM downtime: pause, drain, resume (Azure Local / Windows Server 2022+)
TL;DR: Never reboot a node that is still an active cluster member. Suspend it with -Drain so VMs live-migrate off, reboot, resume it, then let Storage Space...
Thu, Aug 13, 2026 at 2:15 PM
Which VMs are driving storage load? Checking per-VM IOPS, latency, and bandwidth on Azure Local / S2D (Get-StorageQoSFlow)
TL;DR: Run Get-StorageQoSFlow from any cluster node to see live IOPS, latency, and bandwidth for every running VM on the cluster. No agents, configuration, ...
Wed, Oct 14, 2026 at 8:48 PM
Reviewing per-VM network and storage performance over the last hour, day, or week on Azure Local / S2D (Cluster Performance History)
TL;DR: Storage Spaces Direct and Azure Local clusters automatically record per-VM network bandwidth, storage IOPS, and storage latency in Cluster Performanc...
Wed, Oct 14, 2026 at 8:53 PM