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VM backup stalled with the error "got exception while parsing LCN and size from ntfscluster command” after a successful snapshot
VM backup stalled with the error "got exception while parsing LCN and size from ntfscluster command” after a successful snapshot
Updated over a week ago

This article applies to:

  • OS: Windows server

  • Product edition: Phoenix

Problem description

Virtual Machine (VM) backup stops progressing after a successful snapshot creation and gives error “Got exception while parsing LCN and size from ntfscluster command”. The scheduled backups fail as "Backup Window Expired" and Manual (Backup Now) backups will be successful.

Cause

This can occur when the backup job takes long time to parse and process pagefile.sys and hiberfil.sys files.

Traceback

[ERROR] Got exception while parsing LCN and size from ntfscluster command: invalid literal for int() with base 10: '0x80'
[ERROR] Got exception while parsing LCN and size from ntfscluster command: invalid literal for int() with base 10: 'VCN'

Resolution

Let the Phoenix backup proxy back up the entire hiberfil.sys and pagefile.sys as is. To allow that, set VMWARE_EXCLUDE_FILTER to False in the Phoenix.cfg file using the below steps.

  1. Login to the backup proxy.

  2. Stop the Phoenix services.

    /etc/init.d/Phoenix stop
  3. Verify if any Phoenix processes are still running.

    ps -ef| grep -i Phoenix
  4. If any process is still found running, kill the process with this command.

    Kill -9 <process id>
  5. Go to /etc/Phoenix/VMWARE and edit Phoenix.cfg file using vi editor.

  6. Add the below entry and save it.

    VMWARE_EXCLUDE_FILTER = False
  7. Start Phoenix service using below command.

    /etc/init.d/Phoenix start

💡 Tip

When you set VMWARE_EXCLUDE_FILTER to False in the Phoenix.cfg file, back up the pagefile.sys and hiberfil.sys files as it is without compression and deduplication. Otherwise, if Phoenix is able to parse the files then they are compressed and further deduplicated to save the storage space. Storage utilization for this resource is expected to increase a bit with the above steps.


Verification

Again trigger the backup job and it should complete successfully.

See also

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