After running diskpart.exe to extend the disk size in Windows, the partition size does not get updated

Products

• VMware vSphere ESXi

Issue/Introduction

After extending a Windows partition using the Microsoft Diskpart command-line utility or Disk Managements (diskmgmt.msc), you experience these symptoms:

• The Windows server guest operating system (Guest OS) shows an incorrect disk size in Disk Management or on My Computer after you expand the disk.
• The vSphere Client and vSphere Web Client display the correct, increased disk size.
• Within the Windows guest operating system, you see:
   
  • Disk Managements (diskmgmt.msc) displays the correct, increased disk size.
  • Share and Storage Management (storagemgmt.msc) does not show increased size of the disk.
  • The partition size does not get updated.
  • The old partition size is retained.

Note: For more information on extending Windows partitions, see https://learn.microsoft.com/en-us/troubleshoot/windows-server/high-availability/extend-partition-cluster-shared-disk

Cause

This issue occurs because the NTFS driver exhausts its resources when it tries to extend the volume.

Resolution

Use the extend command within the Microsoft Diskpart command-line utility.

For more information, see

• Extend or shrink a data volume in Windows
• Extend a basic volume

Additional Information

https://learn.microsoft.com/en-us/troubleshoot/windows-server/high-availability/extend-partition-cluster-shared-disk