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command line as described in Running File Based Write Filter Command Line Options. The File Based
Write Filter status icon in the system tray remains red while the File Based Write Filter is disabled.
Setting the File Based Write Filter Controls
Use the File Based Write Filter Control dialog box to view and manage your control settings
To view and manage UWF control settings, use the Unified Write Filter Control dialog box.
1. To open the dialog box, double-click the UWF icon in the notification area of the administrator
taskbar.
The Unified Write Filter Control dialog box is displayed.
2. Use the following guidelines setup the Write Filter Controls.
a. UWF Status area includes:
Current Status — Shows the status (Enabled or Disabled) of the File Based Write Filter.
Boot Command — Shows the status of the Boot Command. FBWF_ENABLE means that the
FBWF is enabled for the next session; and FBWF_DISABLE means that the FBWF is disabled for
the next session.
RAM used by FBWF — Shows the amount of RAM used (in Kilobytes and Percentage) that is
being used by the File Based Write Filter. If Current Status is Disabled, RAM Used by FBWF is
always zero (0).
Amount of RAM used for FBWF Cache — Shows (in MB) the amount of RAM (in MB) that is
used as File Based Write Filter cache for the current session.
Cache Setting — Shows the cache setting for the current session.
Warning #1 ( percent) — Shows the FBWF cache percentage value at which a Low Memory
warning message is displayed to the user for the current session.
Warning #2 ( percent) — Shows the FBWF cache percentage value at which a Critical Memory
warning message is displayed to the user, along with another message display counting down
the number of seconds before automatic rebooting will occur for the current session.
Reboot Time Delay (in seconds) — Shows the number of seconds that will lapse before
system reboot in the Warning #2 ( percent) case of cache overflow for the current session.
b. FBWF Cache Settings area includes:
Amount of RAM to be used for FBWF Cache — Shows (in MB) the amount of RAM (in MB) that
is to be used as File Based Write Filter cache for the next session. This value should be in the
range of 16 MB to 1024 MB. There is an additional check that this value should not exceed 1/3
of Total Available RAM.
Advanced Cache Settings area includes options to allow you to improve the effectiveness of
cache memory (Cache Compression, Cache Preallocation, or None).
c. FBWF Warning Settings area includes:
Warning #1 (%) — Shows the FBWF cache percentage value at which a Low Memory warning
message is displayed to the user; Default value = 85, Minimum value = 50, Maximum value =
90.
Warning #2 (%) — Shows the FBWF cache percentage value at which a Critical Memory
warning message is displayed to the user, along with another message display counting down
the number of seconds before automatic rebooting occur; Default value = 90, Minimum value
= 55, Maximum value = 95.
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