While troubleshooting, we realized that one QFX5120-32C is showing an error when trying to commit. 

error: error copying files
(/config/juniper.conf.3.gz->/var/db/config/juniper.conf.4.gz): No such
file or directory

"error: rotation of old files failed"

• The above errors prevent the QFX to commit the changes in the configuration
• The issue reported is known as the disk space in /var/db/config.

• Confirm the issue unable to commit:

root@switch% mgd -i
error: error copying files
(/config/juniper.conf.3.gz->/var/db/config/juniper.conf.4.gz): No such
file or directory

"error: rotation of old files failed"

• We transferred the information stored in /var/db/config* as a backup in /var/tmp/

root@switch% cp /config/db/config/* /var/tmp/

• We deleted and created again the /var/db/config directory.

root@switch% rm -rf  /config/db/config/* 

• After that, the commitment was successful.

root@switch%  exit
root@switch% mgd -i

• This issue is similar to EX Switch generates error message "Rotation of old files failed." while commiting the changes, but the difference is that var/db/config does not have disk space.

If the above solution does not work, please delete any old files and run the below command to clear up space. This will resolve the issue -

root@switch> request system storage cleanup

2025-03-25: Additional solution added.

2023-10-02

• This issue is similar to EX Switch generates error message "Rotation of old files failed." while commiting the changes, but the difference is that var/db/config does not have disk space.