NVP-vProxy: Windows VM FLR failing when Windows "Storage Spaces" is used on the VM
Summary: NetWorker VMware Protection (NVP) Virtual Machin (VM) FLR of a Microsoft Windows VM FLR failing when Windows "Storage Spaces" is configured.
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Symptoms
During vProxy FLR for a Windows VM, the mount completes, but the file system does not display, preventing file selection. The VM operating system is configured with Windows Storage Spaces.
NOTE: Windows Storage Spaces is conceptually similar to software RAID. It is used to present multiple large VMware Virtual Machine Disks (VMDK) as one volume.
Cause
This is a known limitation in NetWorker as the Windows Storage Spaces file system is not supported for file level restore.
When performing the FLR, the vProxy mounts the VMDK disks to the target VM. The file system on the VMDK disks is not individual volumes, but are logical volumes (LVM) created with Windows Storage Spaces. The vProxy FLR solution does not interact with Windows Storage Spaces to create a new logical volume.
Resolution
Workaround:
Perform Instant Access Recovery of the VM and copy the required files. This procedure is detailed in: NVP vProxy: Perform VM FLR without vProxy FLR Agent
Additional Information
Microsoft article on Storage Spaces: https://docs.microsoft.com/en-us/windows-server/storage/storage-spaces/storage-spaces-direct-overview
Affected Products
Backup and Recovery Manager NetWorkerProducts
Backup and Recovery Manager NetWorkerArticle Properties
Article Number: 000038307
Article Type: Solution
Last Modified: 22 Jun 2025
Version: 4
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