IFW Volume Shadow Copy (VSS) Stopped Working
Posted: Sat Oct 15, 2022 8:19 pm
I use IFW to image backup several computers. I have the default set to use VSS. This was working fine until a few weeks ago when on one of the computers IFW forces backup to use Phylock. VSS error "Unable to obtain a lock on C drive."
I would prefer to use VSS for the backup. Only two things changed since VSS no longer works. Updated Windows 11 to 2022-H2 and updated IFW to v3.55.
Windows Event log:
Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface. hr = 0x80070005, Access is denied.
This is often caused by incorrect security settings in either the writer or requestor process.
Operation:
Gathering Writer Data
Context:
Writer Class Id: {e8132975-6f93-4464-a53e-1050253ae220}
Writer Name: System Writer
Writer Instance ID: {6f1bc1b4-3e55-4ef9-a723-8bf49b108397}
Volume Shadow Copy Service error: Cannot find diff areas for creating shadow copies. Add at least one NTFS drive to the system with enough free space. The free space needed is at least 32 Mb for each volume to be shadow copied.
Operation:
Automatically choosing a diff-area volume
Processing EndPrepareSnapshots
Context:
Volume Name: \\?\Volume{83a1a1ec-5bb3-423c-bd4d-65b5c361bae4}\
Volume Name: \\?\Volume{9c2e1272-19b6-41b6-a2da-5bb1afa6640a}\
Execution Context: System Provider
I would prefer to use VSS for the backup. Only two things changed since VSS no longer works. Updated Windows 11 to 2022-H2 and updated IFW to v3.55.
Windows Event log:
Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface. hr = 0x80070005, Access is denied.
This is often caused by incorrect security settings in either the writer or requestor process.
Operation:
Gathering Writer Data
Context:
Writer Class Id: {e8132975-6f93-4464-a53e-1050253ae220}
Writer Name: System Writer
Writer Instance ID: {6f1bc1b4-3e55-4ef9-a723-8bf49b108397}
Volume Shadow Copy Service error: Cannot find diff areas for creating shadow copies. Add at least one NTFS drive to the system with enough free space. The free space needed is at least 32 Mb for each volume to be shadow copied.
Operation:
Automatically choosing a diff-area volume
Processing EndPrepareSnapshots
Context:
Volume Name: \\?\Volume{83a1a1ec-5bb3-423c-bd4d-65b5c361bae4}\
Volume Name: \\?\Volume{9c2e1272-19b6-41b6-a2da-5bb1afa6640a}\
Execution Context: System Provider