When files are deleted, UWF removes them from the overlay and returns the freed resources to the available pool.Īs the drive overlay fills up the available space, you can warn your users that they're running out of space, and prompt them to reboot the device or to run a script to clear the overlay.
(Some apps have high write volumes and will fill up the overlay faster.) The amount of overlay used will depend on: $files.OverlayFiles | select-object -Property FileName,FileSize | export-csv -Path D:\output.csv $files = $wmiobject.GetOverlayFiles("c:") You can use this Powershell script to find out which files are consuming space: $wmiobject = get-wmiobject -Namespace "root\standardcimv2\embedded" -Class UWF_Overlay We recommend enabling UWF on a test device, installing the necessary apps, and putting the device through usage simulations. For example, if the OS requires 2 GB of RAM, and your device has 4 GB of RAM, set the maximum size of the overlay to 2048MB (2 GB) or less. When planning device rollouts, we recommend optimizing the overlay size to fit your needs.įor RAM overlays, you'll need to budget some RAM for the system.
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You can use freespace passthrough to use additional free space on the drive beyond the reserved virtual overlay space.By default, the overlay is cleared on reboot. If your users are expected to make many large writes to the overlay, consider using a disk overlay instead.ĭisk overlay: The virtual overlay is stored in a temporary location on the drive. As the drive overlay fills up the available RAM, device performance could be reduced, and users will eventually be prompted to reboot the device. RAM is often more limited than drive space.By writing to RAM, you can reduce the wear on write-sensitive media like solid-state drives.RAM overlay (default): The virtual overlay is stored in RAM, and is cleared after a reboot.
At certain levels, your device can warn users and/or reboot the device. To increase uptime, set up monitoring to check if your overlay is filling up. You can choose where the overlay is stored (RAM or disk), how much space is reserved, and what happens when the overlay fills up. The Unified Write Filter (UWF) protects the contents of a volume by intercepting write attempts to a protected volume and redirects those write attempts to a virtual overlay.
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