Avamar: Troubleshooting VMware image backup fails when user snapshot is deleted during backup.

Summary: Avamar: Troubleshooting VMware image backup fails when user snapshot is deleted during backup.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
Check out other resources

Symptoms



Vmware image backup failing with the following:    
avvcbimage Info <14665>: 1 snapshots are present on this VM:
  *level=1, children=0, ref='snapshot-7553', 'VEEAM BACKUP TEMPORARY SNAPSHOT':desc='Please do not delete this snapshot.''

While backing up up one or more of the data disks for a VM, the backup fails with this message:    
avvcbimage Info <16041>: VDDK:<date> error -[7FFA0C431700] [Originator@6
876 sub=transport] Reconfigure attempt failed for VM "vm-21" with Vmomi::MethodFault::Exception ("vim.fault.FileNotFound")

avvcbimage Info <16041>: VDDK:VixDiskLib: Unable to locate appropriate transport mode to open disk. Error 13 (You do not have access rights to this file) at 4559.

avvcbimage Info <16041>: VDDK:VixDiskLib: VixDiskLib_OpenEx: Cannot open disk [datastore] vm/vm.vmdk. Error 13 (You do not have access rights to this file) at 4669.

 avvcbimage Info <9772>: Starting graceful (staged) termination, VixDiskLib_Open attempt to connect to virtual disk failed (wrap-up stage)

Cause

In the example above, the user is backing up the same VM at the same time using two different backup products. A process deleted users/non-avamar snapshot while Avamar backup was still running causing the disk specified in the work order to be invalid. 

Example disk info from work order:    
Prior Disk '2001': file(base):'[datastore] vmname/vmname_1.vmdk', backItUp=1
               snapshot file:'[datastore] vmname/vmname_1-000001.vmdk'
               prior size(KB):52428800, current size(KB):52428800, match=1
  
After Avamar snapshot:    
 Current Disk '2001': file(base):'[datastore] vmname/vmname_1.vmdk', backItUp=1
               snapshot(base) file:'[datastore] vmname/vmname_1-000001.vmdk'
               snapshot(curr) file:'[datastore] vmname/vmname_1-000002.vmdk'
               prior size(KB):52428800, current size(KB):52428800, match=1

Then the snapshot was deleted by outside process vmname_1-000001.vmdk file was deleted and thus backup failed with file not found.  

This could also occur if a normal user snapshot was deleted while backups are running.

Resolution

Do not delete snapshots while Avamar backup is running. To avoid snapshot collision like this case, we recommend to only backup a given VM using a single snapshot based backup product. If two snapshot backup products are used on the same VM, they ensure no schedule overlap.

Affected Products

Avamar

Products

Avamar, Avamar Client for VMware
Article Properties
Article Number: 000060144
Article Type: Solution
Last Modified: 05 Mar 2025
Version:  4
Find answers to your questions from other Dell users
Support Services
Check if your device is covered by Support Services.