Hyper-V Best Practices for Maximum VM Performance

Virtualization saves hardware costs, but poorly configured VMs will suffer from terrible I/O bottlenecking. Follow these Hyper-V best practices for Windows Server.

1. Avoid Dynamic Memory for SQL/Exchange

While Dynamic Memory is great for standard web servers, it should be disabled for heavy database workloads like SQL Server, which prefer to lock a static amount of RAM in place.

2. Use Fixed-Size VHDX

Dynamically expanding virtual hard disks save space initially, but they cause fragmentation and slow disk write speeds over time. For production VMs, always provision Fixed-Size VHDX files.

3. Do Not Install Apps on the Host

The physical Hyper-V host should do nothing except run the Hyper-V role. Do not install antivirus (beyond Defender), file shares, or AD Domain Services on the parent partition.

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