Updating Windows Server Insider Preview Build to version 26461.1001

On August 7, 2025, Microsoft dropped a fresh Insider Preview build for Windows Server vNext—Build 26461—and it’s packed with innovations aimed at enterprise resilience, storage performance, and hybrid cloud readiness. Whether you’re a datacenter architect or a curious sysadmin, this build offers a glimpse into the future of Windows Server 2025.

Rack Level Nested Mirror (RLNM) for S2D Campus Cluster

One of the headline features is Rack Level Nested Mirror (RLNM) for Storage Spaces Direct (S2D) Campus Clusters. This enhancement is designed to meet NIS2 compliance for multi-room data redundancy in industrial environments.

Key capabilities:

• Enables fast and resilient storage across multiple racks or rooms.
• Supports all-flash storage (SSD/NVMe) with RDMA NICs (iWARP, RoCE, InfiniBand).
• Requires defining rack fault domains during cluster setup.
• Supports four-copy volumes with both fixed and thin provisioning.

This is a game-changer for factories and enterprises needing high availability across physical fault domains.

Under the Hood: Germanium Codebase

Build 26461 is based on the Germanium codebase, aligning with the broader Windows 11 ecosystem. It supports both AMD64 and ARM64 architectures and was compiled on July 31, 2025.

Final Thoughts

Windows Server vNext Build 26461 is more than just a preview—it’s a blueprint for the next generation of enterprise-grade infrastructure. With RLNM, expanded deployment options, and tighter integration with Azure, Microsoft is clearly doubling down on hybrid cloud and high-availability scenarios.

You can explore the full announcement on Microsoft’s Community Hub. Enjoy your testing 🚀