Troubleshooting: DPM volumes are flagged as missing and VolSnap logs event ID 86 - The Official System Center Data Protection Manager Team Blog - Site Home - TechNet Blogs

Troubleshooting: DPM volumes are flagged as missing and VolSnap logs event ID 86

Troubleshooting: DPM volumes are flagged as missing and VolSnap logs event ID 86

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imageHi everyone, Marc Reynolds here. I have seen some issues recently where DPM volumes are flagged as “missing” in the DPM console so I wanted to take a minute and show you an easy way to fix this.

Symptoms

In System Center Data Protection Manager, DPM volumes are showing as missing. In the DPM admin console (MMC) under Management\Disk, the storage pools disks have a red "x". In Disk Manager the disks have a status of "Errors" and the volumes are listed as "Healthy at Risk". The option to reactivate the disks is grayed out.  In addition, the system event log may contain the following volsnap error:

Log Name: System
Source: volsnap
Date: 
Event ID: 86
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: DPMServer.domain.com
Description:
Volume C:\...es\Microsoft DPM\DPM\Volumes\Replica\File System\vol_79ec325a-145d-4bfc-a089-68fed8e0aeed is offline for shadow copy protection. A read or write failure to shadow copy storage occurred. Please ensure that the shadow copy storage is still present in the system. Please try clearing the protection fault or restart the computer. If all else fails, revert out of shadow copy protection mode to reclaim the use of the volume while losing the shadow copies.

Cause

Disk I/O errors have caused the disk to log errors and the volumes to be flagged as "Healthy at Risk". DPM checks the status of the volumes and if it finds a volume in any state other than "Healthy" it reports the volume as missing and the DPM jobs linked to that volume will fail.

Resolution

  1. Stop DPM
  2. In Disk Manager right click on the disk(s) with "Errors" and take it offline
  3. Once the disk is offline, right click and bring it back online
  4. Once it comes online, the volumes should now show as "Healthy" and the volume missing errors will no longer be present in DPM.

If any of the volumes are showing up in Disk Manager as "Raw" you will need to bring them out of Shadow Copy Protection mode using vshadow-x64.exe

Marc Reynolds | Senior Support Escalation Engineer

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  • I am looking to create either a rule or a monitor in Operations Manager to detect this event and create an alert. Is there another event that would indicate that the disk is now healthy? If I can pair up this event ID 86 as the "unhealthy" event with another event as the "healthy" event, I can create a SCOM monitor that will show health state of the DPM server.

  • I'm trying to find the vshadow-x64.exe utility to remove some disks from shadow copy protection.  In the VSS SDK I have, the vshadow utility doesn't support the -cpm switch.  I'm running 2008 R2.  Do you know which SDK includes the vshadow utility with the -cpm switch?

  • How about when this occurrs and the drives don't actually go missing?

    social.technet.microsoft.com/.../061a8ac3-ac01-461a-b75b-40cdb3683e23

  • Great post, solved my problem. Thank's!

  • Quote: "If any of the volumes are showing up in Disk Manager as "Raw" you will need to bring them out of Shadow Copy Protection mode using vshadow-x64.exe"

    vshadow-x64 is not available for Windows Server 2012 R2 any more. Is there any other chance to bring the volumes out of "Shadow Copy Protection mode"? We see the Event ID 86 after in-place upgrade from Windows Server 2012 to R2 with DPM 2012 R2. There are about 80 volumes with file system "RAW" instead of "NTFS".