After installing or upgrading to InfoScale for Windows 7.4.1, the VSS Shadow Copies feature is disabled and reports, "No volume is eligible for shadow copies"

Problem

After installing InfoScale 7.4.1, the Widows VSS / COW Snapshot functionality is disabled and it cannot be re-enabled.

After upgrading InfoScale 7.x to 7.4.1, the Windows VSS / COW Snapshot functionality is disabled and it cannot be re-enabled.

Note: This issue is only seen with Windows Server 2016 and Windows Server 2019.
 

Error Message

No volume is eligible for shadow copies

The following error may also be reported to the Application Event Log:

Log Name: Application
Source: VSS
Event ID: 12289
Level: Error
Description:
Volume Shadow Copy Service error: Unexpected error DeviceIoControl(\\?\Volume{GUID} - 00000000000001E8,0x00530018,0000000000000000,0,000001853790C070,4096,[0]). hr = 0x80070057, The parameter is incorrect.
 

Cause

The installation/upgrade results in a specific registry key value getting modified to an invalid Type. 

Registry Key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{71a27cdd-812a-11d0-bec7-08002be2092f}

Value: The UpperFilters value should have a type of REG_MULTI_SZ; however, the upgrade/installation of 7.4.1 changes this to 0x20 This is not a valid type and causes this issue.

Solution

Two solutions are provided below (automated hotfix and manual steps). Both accomplish the same end-result, so either option can be followed.

With either solution provided, a reboot is required after performing the steps.
 

Solution 1: A hotfix is available for Windows Server 2016 and 2019 at the following location: https://sort.veritas.com/patch/detail/15134.

The readme included in the link provides the installation instructions. Following Step 4, the hotfix installation wizard will prompt for a reboot which will be required before the VSS / COW Snapshot functionality is available.
 

Solution 2: For a manual workaround/solution (instead of applying the above hotfix), the following steps can be performed. These are the same operations the hotfix installer performs.

1. Open the Registry (regedit), and browse to the following key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{71a27cdd-812a-11d0-bec7-08002be2092f}

2. Export this key to maintain a backup. 

3. Delete the UpperFilters value in the right-pane (right-click > Delete).

4. Create a New > Multi-String Value named UpperFilters.

5. Modify this UpperFilters value to add the Value Data: volsnap

6. Reboot the server.