Windows 10: Regarding UWF (Unified Write Filter)

Discus and support Regarding UWF (Unified Write Filter) in Windows 10 Customization to solve the problem; I have some HP thin-client where Windows 10 Enterprise LTSB custom image is installed. These clients having 4 GB RAM is installed and 2.9 GB is usable... Discussion in 'Windows 10 Customization' started by mehere1989, Sep 11, 2018.

  1. Regarding UWF (Unified Write Filter)


    I have some HP thin-client where Windows 10 Enterprise LTSB custom image is installed. These clients having 4 GB RAM is installed and 2.9 GB is usable because of video memory.

    As we know in the write filter environment all writes are in overlay and system must reboot to clear the overlay memory otherwise system will get crashed after overlay exhausted.

    In this OS we have only one drive C which is protected by UWF and additional drive Z which is RamDisk for temporary writes and maximum of 768 MB, so its not possible to create page file in protected volume because while enabling UWF page file don't exist any more and the other drives are Z very less in memory.

    Now using some tool while booting OS, i have moved 8GB of partition from c drive and created additional drive D which is not protected then configured page file range 4.5 GB to 7GB in this drive after enabling the UWF still page file present and working.


    Now i have know UWF overlay size and how to calculate the system UP time which is depend upon the size of the overlay size.

    Is it good to set 600 MB or 1000 MB for overlay size and what are the UP times, now system is not complete running as i can see in it used overlay memory in 2 days around 100 mb ?



    Thanks in advance.

    :)
     
    mehere1989, Sep 11, 2018
    #1
  2. O_ro Win User

    Unified write filter servicing screensaver not showing up

    Joy,

    Thank you for your reply. sfc /scannow did not find any violations. The power troubleshooter however has NOTHING to do with UWF not executing the correct activity. It's master servicing script goes through all of the steps it's supposed to, but the servicing
    mode itself does not act like it should. That is the problem. I require uwf servicing mode to execute and complete its login process, as well as show the screensaver. Currently it does neither.

    I will appreciate further assistance.

    Were you able to find a solution?
     
  3. Unified write filter servicing screensaver not showing up

    Joy,

    Thank you for your reply. sfc /scannow did not find any violations. The power troubleshooter however has NOTHING to do with UWF not executing the correct activity. It's master servicing script goes through all of the steps it's supposed to, but the servicing
    mode itself does not act like it should. That is the problem. I require uwf servicing mode to execute and complete its login process, as well as show the screensaver. Currently it does neither.

    I will appreciate further assistance.
     
    MattBarrXO, Sep 11, 2018
    #3
  4. Regarding UWF (Unified Write Filter)

    Unified Write Filter (Win10LTSB) not working

    Hi all

    I'm currently trying to migrate from Windows Embedded Standard 7 SP1 (WES7) to Windows 10 LTSB (long term servicing branch). I'm having a major problem with the write protection layer in Win10 LTSB that I'm hoping someone can help with (I think it is a bug
    but perhaps I'm doing something wrong).

    Note that I have tried both Windows 10 LTSB 2015 and Windows 10 LTSB 2016. I have applied all Windows updates and the Unified Write Filter feature is enabled.

    Question 1:

    In WES7, the write protection was known as File Based Write Filter (FBWF). I used this to lock down the operating system but allow write access to a data folder on the same disk volume as my application collects and buffers data in real time - ready to be
    copied across the network at a later time. This worked fine.

    In Win10LTSB, I can't get the write protection (known as Unified Write Filter - UWF) working reliably. I've set up the UWF to protect the C: drive as I did with WES7. I've also set it up to exclude a folder from the write protection layer (lets call it C:\Excluded).
    When I create files/data in this folder, they are correctly stored on the disk (as the folder is excluded from the write protection layer) and are still present after a reboot - as they should be. So far, this all works correctly.

    The problem is that as files are being stored correctly in this folder, the size of the RAM (or disk) overlay reduces by the same amount. After a few minutes of successfully storing data in this excluded folder, the write protection overlay fills up and
    the PC grinds to a halt.

    In WES7, files created in an excluded folder did not affect the size of the overlay at all - which is correct. In Win10LTSB, files created in the excluded folder cause the size of the available overlay (RAM or disk) to reduce to the point where the PC will
    fall over.

    Does anyone have any experience in this area? Have I done something wrong or is this a bug? As it stands, I won't be able to migrate from WES7 to Win10LTSB for my product until this is resolved as I need to collect data dynamically into a folder that is
    excluded from the write protection layer.

    Question 2:

    With WES7, I was able to see which files had been diverted to the RAM overlay using the command \Fbfwmgr.exe /overlaydetail

    This permitted me to find out which files were consuming the RAM overlay and add those filenames/locations to the exclusion list as necessary. I can't find any way of looking at the files/folders that are currently consuming the RAM/disk overlay of the Win10LTSB
    unified write filter.

    Can anyone help?
     
    SimonMorrell, Sep 11, 2018
    #4
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Regarding UWF (Unified Write Filter)

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