This article is intended to provide more information about a specific issue that can be identified by running a Best Practices Analyzer scan for Hyper-V. It also can be used without running a scan, as general troubleshooting and best practice information to help you configure your server appropriately. If you have troubleshooting steps or information that would improve this article, please add it. For instructions on how to edit a TechNet Wiki article, see Wiki: How to Use the Editor.
For more information about best practices and scans, see Run Best Practices Analyzer Scans and Manage Scan Results.
Note: The following sections provide details about the specific issue. Italics indicates UI text that appears in the Best Practices Analyzer tool for the specific issue.
Impact
If the virtual hard disks are stored on physical disk that has a sector size of 4K, the virtual machine or applications that use the virtual hard disk might experience performance problems. This affects the following virtual machines: <list of virtual machines>
Resolution
Use the Create Virtual Hard Disk Wizard to create a new VHD-format or VHDX-format virtual hard disk and specify the existing virtual hard disk as the source disk. The new virtual hard disk will be created with alignment between the virtual blocks and physical disk.