Avamar: Unable to restore files from VM backup using FLR

Summary: Virtual machine (VM) File Level Restore (FLR) backups fail because the Avamar proxy cannot resolve the backup target (Data Domain) Domain Name System (DNS) name.

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Symptoms

Browsing VM backups using FLR fails with this error message:

Avamar UI Error while Browsing a VM to do a FLR

  • The affected VM does not exceed any FLR limits.
  • FLR fails during the browsing phase.

On the FLR proxy, the MountMgr.log file is located in:

/usr/local/avamarclient/bin/logs

These errors indicate that the proxy cannot retrieve the backup list from the target Data Domain server:

[MM - DEBUG] sAssetPath=/mnt/dunion/<vCenter_name>/VirtualMachines/<VM_name_UUID>/by-number/0000149
[MM - ERROR] HLPR_ListOfDirectories failed for/mnt/dunion/<vCenter_name>/VirtualMachines/<VM_name_UUID>/by-number/0000149/VMFiles
[MM - ERROR] Unable to find backed up VMDK images for:/mnt/dunion/<vCenter_name>/VirtualMachines/<VM_name_UUID>/by-number/0000149

Despite these errors, the backup exists and is visible when verified from the Avamar Utility Node:

mccli backup show --name=/<vCenter_name>/VirtualMachines/<VM_name_UUID>
Sample output: 
0,23000,CLI command completed successfully.
Created              Label  Size     Retention Hostname
yyyy-mm-dd hh:mm PM  149    ##.# GB   D         <AVAMAR_FQDN>
The Avamar server IP is correctly defined in the axionfs.cmd file located in: 
/usr/local/avamar/var
Example: 
--server=xxx.xxx.xxx.xxx
--id=restoreonly
--password=###########
--primarybackupdir=by-number
--encrypt=tls
 

Cause

The Avamar proxy cannot resolve the Data Domain Fully Qualified Domain Name (FQDN).

The following errors appear in the latest axionfs_*.log file located in:

/usr/local/avamar/var
axionfs Info: Connecting to Data Domain Server "DD_FQDN"
netsys::getaddrinfo failed for DD_FQDN: Name or service not known
Failed to resolve Data Domain Server name "DD_FQDN" to an IP address
Data Domain login FAILED
Unable to retrieve DDR info for 'VMConfiguration'
Because the proxy cannot resolve the Data Domain hostname, FLR cannot access the required backup metadata.

Resolution

Ensure that the Avamar proxy can resolve the Data Domain FQDN.

Step 1: Verify DNS Resolution

  • Run the following commands on the Avamar proxy: 
    nslookup <DataDomain_FQDN>
nslookup <DataDomain_IP>
  • If DNS resolution fails, proceed to Step 2.

Step 2: Update Name Resolution on the Proxy

  • Use one of the following methods:
    • Option A: Update DNS configuration
    • Edit the resolver configuration file and ensure the correct DNS servers and search domain are configured: 
      /etc/resolv.conf
 
    • Option B: Update the hosts file
    • Manually add the Data Domain FQDN and IP address to: 
      /etc/hosts
    • Example: 
      xxx.xxx.xxx.xxx   DD_FQDN
    • After correcting name resolution, retry the FLR operation.
 
 

Affected Products

Avamar

Products

Avamar, Avamar Client for VMware
Article Properties
Article Number: 000067854
Article Type: Solution
Last Modified: 01 ذو القعدة 1447
Version:  5
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