If you start seeing errors on the ftrack server you are likely reaching the inode limit on your server OS. Either increase the limit or find what is causing it. With ftrack it is likely the sessions folder that has been filling up over time as more and more sessions have been created. You can simply delete the folder "/opt/ftrack_config/data/sessions" to get rid of all the session files. All users will be required to login again after the folder has been removed. Please be careful when deleting the sessions folder to avoid accidentally deleting the data folder. 

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