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Immutable failure

  • February 24, 2026
  • 2 comments
  • 28 views
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I have two file shares: one for backing up my jobs and one for immutable backups. They are both backing up the same virtual machines. However, my immutable backups keep failing. The immutable repository also shows as Unavailable under Managed Servers.

The error I’m getting is: ‘Failed to make the backup file immutable after applying the retention policy: Read-only file system. Unable to open file [.veeam.635.lock] in directory [/BACKUPS/"job_name"] — Error: Read-only file system (POSIX).’

      2 comments

      coolsport00
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      • coolsport00
      • Veeam Legend
      • February 24, 2026

      ​@scyang2 -

      We need way more info here. What Veeam product are you using? Describe your job(s). Is what you’re backing up VM(s) or physical? Etc, etc….

      Also, just an initial guess...but if you use an A/V solution, make sure you have exclusions in place on the source being backed up. Follow the below:

      https://www.veeam.com/kb1999

      Shane Williford - Veeam VMCA/VMCE | Veeam Legend | VUG Leader | VCP-DCV | Twitter: @coolsport00
        AndrePulia
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        • AndrePulia
        • Veeam Vanguard
        • February 24, 2026

        ​@scyang2 I think the FS is mounted as R/O, make a simple test, su - to the related user, and type the command $touch /BACKUPS/filename and check the results. 

        The touch command will try to create an empty file named //BACKUPS/filename

        André Pulia - VMCA | VMCE | VMCT |Veeam Vanguard | VUG Leader Brazil | ObjectFirst ACE | HPECI | VCI | Nutanix Certified Instructor | Twitter: @andrepulia | Blog Site – https://pulia.com.br | https://www.credly.com/users/andre-pulia
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