Technical Tip: How to fix root disk space full due to /fsmopt.tar.gz

The fsmopt.tar.gz files found in the root (/) directory are backup archives of the /opt/fsm directory created automatically during version upgrades or patching.

These files are generated as part of FortiSIEM's internal upgrade mechanism, for rollback or recovery in case of upgrade failure.

This file can lead to high disk usage of the root partition. It is not recommended to delete these files. The recommended method is to move the file to a drive with enough disk space, then create a symlink to the root partition.

In this example, /fsmopt will be moved under /opt:

mkdir -p /opt/upgrade-backups
mv -vf /fsmopt.tar.gz /opt/upgrade-backups
ln -s /opt/upgrade-backups/fsmopt.tar.gz /fsmopt.tar.gz