Backup not working due to VSS issue

Question

Our automated backup solutions which is Cove is failing to backup this server, when I checked the event logs I'm getting the following errors

This is Windows Server 2016 running on HYPER-V

Volume Shadow Copy Service error: Unexpected error calling routine GetVolumeNameForVolumeMountPoint is now failing on the volume, winerror 0x00001126. . hr = 0x80071126, The file or directory is not a reparse point. . Operation: PrepareForSnapshot Event Context: Execution Context: Writer Writer Class Id: {e8132975-6f93-4464-a53e-1050253ae220} Writer Name: System Writer Writer Instance ID: {6ab1eb14-07fb-4edb-a839-5096deee558c}

C: - 101GB free out of 200GB

D: - 395GB free out of 800GB

Troubleshooting done:

• Tried to do the following troubleshooting:

Rebooted the server multiple times

Disabled the AV on the server

Run the following

sfc / scannow - Windows Resource Protection did not find any integrity violations

dism /online /cleanup-image /scanhealth

dism /online /cleanup-image /checkhealth

dism /online /cleanup-image /restorehealth - getting error 14, I already created the IRPStackSize on regedit with the value of 12

dism /online /cleanup-image /restorehealth /source:WIM:d:\sources\install.wim:2 /limitaccess - cannot find source

Any insights or directions that can help?

Thanks in Advance!

Answer 1

• Was able to reach out to COVE support and were able to pinpoint the reparse point causing the issue, So there's a service that's located on a substitute drive which is not a mountpoint, we changed the path of the service to the original path (removed the substitute drive from the path) on the registry and it fixed the issue.

Answer 2

Hi,

The error 0x00001126 ERROR_NOT_A_REPARSE_POINT means the file or directory is not a reparse point.

System Error Codes (4000-5999) (WinError.h) - Win32 apps | Microsoft Learn

It seems your backup application references a wrong path as the mount point of the volume. I think it's better to contact the software vendor to fix the issue.

Best Regards,

Ian Xue

Answer 3

The problem is, this is a Windows issue - I tried running dir /al /s and run a fsutil query on those directory that showed up and the only reparse point that it can find is

C:>fsutil reparsepoint query C:\Windows\SYSVOL_DFSR\sysvol\xxx.loc

Reparse Tag Value : 0xa0000003

Tag value: Microsoft

Tag value: Name Surrogate

Tag value: Mount Point

Substitue Name offset: 0

Substitue Name length: 66

Print Name offset: 68

Print Name Length: 58

Substitute Name: ??\C:\WINDOWS\SYSVOL_DFSR\domain

Print Name: C:\WINDOWS\SYSVOL_DFSR\domain

Reparse Data Length: 0x00000088

Reparse Data:

0000: 00 00 42 00 44 00 3a 00 5c 00 3f 00 3f 00 5c 00 ..B.D.:..?.?..

0010: 43 00 3a 00 5c 00 57 00 49 00 4e 00 44 00 4f 00 C.:..W.I.N.D.O.

0020: 57 00 53 00 5c 00 53 00 59 00 53 00 56 00 4f 00 W.S..S.Y.S.V.O.

0030: 4c 00 5f 00 44 00 46 00 53 00 52 00 5c 00 64 00 L._.D.F.S.R..d.

0040: 6f 00 6d 00 61 00 69 00 6e 00 00 00 43 00 3a 00 o.m.a.i.n...C.:.

0050: 5c 00 57 00 49 00 4e 00 44 00 4f 00 57 00 53 00 .W.I.N.D.O.W.S.

0060: 5c 00 53 00 59 00 53 00 56 00 4f 00 4c 00 5f 00 .S.Y.S.V.O.L._.

0070: 44 00 46 00 53 00 52 00 5c 00 64 00 6f 00 6d 00 D.F.S.R..d.o.m.

0080: 61 00 69 00 6e 00 00 00 a.i.n...

Answer 4

Hi,

Please run dir /al /s C:\ to check the reparse points on the C drive or other drives on your computer. If there are no mount points, VSS snapshots are not mounted correctly or they have been unmounted by the backup app.

Answer 5

Theres no reparse point aside from the sysvol that I posted above , I already deleted the shadows using 'Vssadmin delete shadows /all', rebooted the server and its still throwing the same error on the event log