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Issue

During Veeam backups using the Linux agent, some users may encounter errors related to the inability to access virtual devices. The errors typically manifest as follows:

• No such device
• POSIX: Failed to open file [/dev/veeamimageX]
• Failed to open emulated disk
• Failed to open disk for read
• Failed to upload disk
• Agent failed to process method {DataTransfer.SyncDisk}

These errors suggest that the Veeam service is unable to interact with the virtual device file because it might not be available or not correctly initialized.

Resolution

To address this issue, follow the steps outlined below:

1. Access the Linux System:
   • Log into the Linux machine using an account that has root privileges or can use
     su

     or

     sudo

     to execute commands as the superuser.

2. Unmount the Problematic Veeam Virtual Device:
   • Run the following command to unmount each Veeam virtual device that is causing errors:
     <strong>umount /dev/veeamimageX</strong>

     Replace

     X

     with the appropriate device number corresponding to the error message.

3. Restart Veeam Service:
   • Restart the Veeam service to apply the changes and reinitialize the virtual devices. Use the following command:
     <strong>systemctl restart veeamservice</strong>

     This command ensures that the Veeam service is restarted and any issues with previous mounts are cleared.

4. Rerun the Backup Job:
   • Once the service has been restarted, rerun the backup job from the Veeam Backup & Replication (VBR) console to check if the issue is resolved.

Additional Tips

• Ensure that there are no underlying disk issues on your Linux machine that may be causing the Veeam backup process to fail.
• Check the permissions of the
  /dev/veeamimageX

  devices to confirm that the Veeam service has the required access rights.

• If the problem persists, refer to Veeam’s official documentation or contact Veeam support for further assistance.