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Immutable failure

  • February 24, 2026
  • 4 comments
  • 45 views

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).’

4 comments

coolsport00
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  • 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


AndrePulia
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  • 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


Chris.Childerhose
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@scyang2  - just wanted to follow up to see if you got an answer to your inquiry?  If so, please mark the best answer that helped the most, even if your own.  Look forward to assisting further if needed.


Marcel.K
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  • Veeam Legend
  • March 21, 2026

looks that 

veeam cannot write its internal lock files (.veeam.X.lock)

i would suggest to check permission for service account

veeamuser : veeamgroup rwx permissions

 

or as ​@AndrePulia  mentioned, this is simplest test to try to create file under service account