I have peculiar issue..as follows…. Please help us to find solution.

We have a nsf mount file system mounted across 5 servers and keeping RMAN backups on that. Most of the days backups going through without any issue. But occasionally (monthly 3-4 time) it fails with the following error. But if we re-run the backup it goes through without any issue. There is no space issue at all. Almost 200 GB is free always… is anyone experienced same error? How to solve it? Thanks in advance for the help.

'ORA-19502: write error on file
ORA-27072: File I/O error
Linux-x86_64 Error: 2: No such file or directory

Based on looking up the error (did you try Google or the Oracle knowledgebase for those ORA messages???), the behavior you've seen, and my past experience, you're out of space. The fact that you can retry it and it works would tend to support that theory. The reason you then 'see' 200GB free, is because when your other servers are backing up, there are several steps that are taken...usually a file is created, then ANOTHER file is created that's smaller (compressed). You can easily run out of room temporarily...have your system disk monitors update every minute or so during the backup cycles, to see if you catch it.

You could try to stagger your system backups, so they don't all run at the same time.

Only one backup is running at a time. Not multiple backup. So we think space is not the issue.

Don't THINK it's not the issue...KNOW it's not the issue. Unless you're monitoring things, and know FOR CERTAIN, you could still have a problem.

You don't give any details about the databases, how big they are, or how big the total free space on the backup device is. You also don't mention what (if anything), the backup script is doing, before or after the backup job, or how the files are getting moved about. Without details, anything we say is guesswork.