UWF automatically excludes these registry entries from filtering. UWF maintains configuration settings in the registry for the current session and for the next session after a device restart. Static configuration changes do not take effect until after a device restart, and these changes are saved in the registry entries for the next session.
Dynamic configuration changes occur immediately and persist after a device restart. Skip to main content. This browser is no longer supported.
Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? If you do not want to initiate a write filter restart to persist this content, make sure this check box is not selected. When the check box is not selected, you will not initiate a restart, but the deployment will be applied to the overlay at the deadline schedule, or during a configured maintenance window.
The drawback with this choice is that your installation might not persist after a restart. For applications, software updates etc. Obviously, this introduces a delay and there is a further delay because the device must restart each time before the required changes are re-applied to the overlay. The following table provides information about whether Configuration Manager supports an opportunistic persist and a forced persist to manage write filters.
None of these features require or support write filter exceptions. As shown in the previous screenshot, the forced persist option for a software deployment is a check box called Commit changes at deadline or during a maintenance window. For the Endpoint Protection client setting, it is called For Windows Embedded devices with write filters, commit Endpoint Protection client installation.
Although we need write filters to be disabled so that we can apply required changes, we also want to limit any unwanted writes to the disk while the write filters are disabled. New in Configuration Manager SP1, when Configuration Manager disables write filters, it prevents all users except administrators from logging on to the device.
If users try to log on, they see a servicing lock screen when they try to log on to their embedded device.
The following screenshot shows what this looks like for Windows Embedded Standard 7. The world of embedded devices has a wide variety of usage scenarios when it comes to end users, some of which are as follows:. The changes we made in Configuration Manager were to ensure reliable operation for the scenarios where there is no user interaction during management actions, such as software installations. So what does this mean if you plan to use Windows Embedded to deliver a Thin PC solution to your users?
This scenario is supported, but the following user interactions are not available:. Configuration Manager does not support software deployments that have a purpose of Available. If you target a software deployment to an embedded device, it does appear in Software Center but if users try to install it when write filters are enabled, they see an error message that they do not have permissions.
You can interactively install the software when write filters are disabled, but remember that if Configuration Manager disables the write filters as part of another deployment, only administrators can log on to the embedded device. Software Center lets users configure their business hours and select an option to only install software outside their specified business hours.
If we made these options available to users on embedded devices that had write filters disabled, their configuration choices would not persist after a restart. However, note that if the embedded device was imaged when write filters were disabled, and these options were configured, the image would include these settings and users will not be able to change them. This end result might be suitable for your environment, or it might not. If you plan to image embedded devices, consider this behavior before you capture the image.
In line with disabling the configuration of non-business hours in Software Center, we also disabled the user notification option to postpone a software deployment to non-business hours. You must turn on UWF before you can configure it.
You can choose where the overlay is stored RAM or disk , how much space is reserved, whether the overlay persists after a reboot. To increase uptime, set up monitoring to check if your overlay is filling up. To learn more, see UWF Overlay location and size. A volume is a logical unit that represents an area of persistent storage to the file system that is used by the OS. A volume can correspond to a single physical storage device, such as a hard disk, but volumes can also correspond to a single partition on a physical storage device with multiple partitions, or can span across multiple physical storage devices.
When you configure UWF to protect a volume, you can specify the volume by using either a drive letter or the volume device identifier. If you specify a volume using a drive letter, UWF uses loose binding to recognize the volume. By using loose binding, drive letters can be assigned to different volumes if the hardware or volume configuration changes.
If you specify a volume using the volume device identifier, UWF uses tight binding to recognize the volume. By using tight binding, the device identifier is unique to the storage volume and is independent from the drive letter assigned to the volume by the file system.
If you want to protect a volume with UWF while excluding specific files, folders, or registry keys from being filtered by UWF, you can add them to a write filter exclusion list. When a device is protected with UWF, you must use UWF servicing mode commands to service the device and apply updates to an image.
You can use UWF servicing mode to apply Windows updates, antimalware signature file updates, and custom software or third-party software updates. UWF uses Windows Event Log to log events, errors and messages related to overlay consumption, configuration changes, and servicing.
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