Lot of customers are still dependent on Microsoft operating systems and applications. The most business critical applications are Active Directory and Microsoft SQL Server. Virtualization of these business critical systems is easy up to some scale and availability. When the scalability, performance and availability are top priority, your Technical Design is starting to be more complex. That's exactly where the fun starts,
Following four documents are great sources for any virtualization of business critical Enterprise application on VMware Platform.
Architecting Microsoft SQL Server on VMware Cloud Foundation
AI generated summary ... "This technical white paper provides best-practice guidelines for architecting and deploying Microsoft SQL Server on the VMware Cloud Foundation (VCF) platform. It emphasizes a "virtualization-first" strategy, detailing how VCF’s integrated compute, storage, and networking components can optimize database performance while reducing operational complexity. The documentation covers essential right-sizing techniques and configuration settings for vSphere High Availability, DRS, and vNUMA to ensure workload efficiency. Additionally, it introduces the Host Span Limit compute policy to help organizations maintain strict software licensing compliance across virtualized clusters. By aligning hardware resource allocation with specific SQL Server requirements, the guide aims to maximize uptime and scalability for mission-critical database environments."
My thought ... "Significant part of document is about NUMA / vNUMA considerations. If you can avoid NUMA you should do it, however, VMs hosting large SQL databases very often requires more CPU and RAM resources then a single NUMA node and you have to design so called MONSTER VM. If so, this document is for you."
Architecting Microsoft SQL Server for High Availability on VMware Cloud Foundation
AI generated summary ... "This technical white paper outlines architectural strategies for deploying Microsoft SQL Server 2025 on VMware Cloud Foundation 9. The document emphasizes achieving high availability and resilience by integrating SQL Server features like Always On Availability Groups and Failover Cluster Instances with VMware’s vSphere capabilities. It provides detailed guidance on storage configuration, specifically the use of clustered VMDKs and Raw Device Mapping to ensure stable database performance. Furthermore, the text addresses lifecycle management and the importance of adhering to vendor compatibility guides for mission-critical systems. By leveraging vMotion Application Notification and DRS anti-affinity rules, administrators can minimize downtime during maintenance and host failures. Ultimately, the guide serves as a best practices manual for optimizing virtualized database environments for modern, data-driven businesses."
My thought ... "High Availability is one of 6 design qualities and Infrastructure Architect should consider. In this document, High Availability of MS-SQL is discussed into detail. The document cover Always On Failover Cluster Instances (FCIs) and Always On Availability Groups (AGs), since these remain the dominant methods for deploying SQL Server high availability on VMware vSphere and VCF 9. Both FCIs and AGs require WSFC, meaning every SQL Server HA deployment must begin with proper planning and configuration of Windows Server Failover Clustering inside the VM. Without a functioning WSFC foundation, neither an FCI nor an AG can be deployed."
Running Microsoft SQL Server Failover Cluster Instance on VMware vSAN with VMware Cloud Foundation 9
AI generated summary ... "This technical white paper outlines how to implement Microsoft SQL Server Failover Cluster Instances within the VMware Cloud Foundation 9 environment. It emphasizes the use of VMware vSAN to provide native support for shared virtual disks, utilizing SCSI-3 Persistent Reservations to maintain high availability. The document details architectural strategies for both standard and stretched clusters, ensuring database resilience across multiple data sites. Furthermore, it provides a comprehensive migration guide for transitioning legacy storage setups to modern vSAN-based shared VMDKs. By following the included performance recommendations and configuration steps, administrators can achieve streamlined management and robust failover capabilities for critical database workloads."
My thought ... "There is often technical conviction that Microsoft HA Clustering (WSFC aka MSCS) requires external storage and LUNs connected as RDM (Raw Device Mapping). If you are one of these people, this document is for you. VMware primary storage in VMware Cloud Foundation is vSAN and this document will show you how shared VMDKs can be used for Microsoft WSFC, because vDisks on vSAN support SCSI-3 Persistent Reservations (SCSI3PR)."
Virtualizing Active Directory Domain Services on VMware Cloud Foundation
AI generated summary ... "This technical white paper outlines best practices for virtualizing Active Directory Domain Services using VMware Cloud Foundation. It highlights how modern features like VM Generation-ID and VM-level encryption resolve historical concerns regarding data integrity and security. The text provides specific guidance on time synchronization, recommending the use of the Windows Time Service over VMware Tools to prevent clock drift. Additionally, the source explains how to avoid USN rollback and replication failures through proper architectural design. By following these updated standards, organizations can safely achieve one hundred percent virtualization of their directory infrastructure. Therefore, the document serves as a comprehensive reference for architects and engineers seeking to maximize operational efficiency and availability."
My thought ... "Time synchronization is one of my favorite topics when it comes to Active Directory, because about 15 years ago I experienced a major outage caused by incorrect time synchronization — and I will never forget it. Real-world experience like that is invaluable."
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