I am using Magento 22.214.171.124 and enable full page cache from admin. It seems the page speed is good but there is no files generated under /var/full_page_cache. I check the folder permission and its set to 777 , /var folder permission is also set to 777. If I remove this folder, Magento recreates this folder automatically, but no files are generated under this folder. Some of the folder is showing the usergroup as root:root while some of the folder shows apache:apache. full_page_cache folder is showing apache:apache as usergroup.
Any idea what could be the problem?