Unexpected Order of the Upper Filters List May Cause Inability to Boot or Inability to Create Page Files

!This issue has been fixed in v10.0.1.

Description

If the Upper Filters registry key has the Upper filters listed in any order that does not have ExtMirr last, problems can occur. On Windows Server 2022, the server will not be able to boot. On Windows Server 2025, the server will not be able to create page files, causing severe performance degradation.

Suggested Action

Using the Compatibility Utility:

• Run this utility on any system upgrading to DataKeeper v10.0.0

• Download the utility, checksum, and readme files from the following location, and follow the steps in the readme file to run the utility:
  https://downloads.us.sios.com/utilities/PW-17108-Upgrade-Compat-Utility/

If the provided utility is not used, perform the following manual procedure:

Ensure that the Upper Filters list has ExtMirr listed last.

1. Navigate to the following registry key: ​​​HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{71a27cdd-812a-11d0-bec7-08002be2092f}
2. Check the UpperFilters registry value.
   1. If ExtMirr is listed last, no further action is required.
   2. If ExtMirr is not listed last, move it to last.

!You must ensure that each value is on a separate line when you edit the key. If you do not, it may cause a BSOD after a reboot!

Disable DataKeeper functionality to automatically replace ExtMirr if it is removed. To do this, set the FixUpperFilters registry value to 0 under the following registry key:

1. Navigate to the following Registry Key: HKLM:\SYSTEM\CurrentControlSet\Services\ExtMirr\Parameters
2. Right-click on the FixUpperFilters registry value and select Modify
3. Set the value to 0
   

Refer to Upgrading SIOS DataKeeper Cluster Edition