At Atlassian, we create popular software tools to help every team unleash their full potential. We use our issue tracking tool JIRA to handle customer support issues from around the globe. As the business grew, we decided to move from a single server instance of JIRA to our JIRA Data Center product on AWS infrastructure to increase reliability, scale, and security. JIRA Data Center's requirement to use a shared file system caused us to try several in-house and third-party solutions prior to the availability of Amazon Elastic File System (Amazon EFS). We chose EFS for its performance, ease of use, automatic scaling, and out-of-the-box distribution capabilities. In this session, we discuss how Atlassian uses EFS to run JIRA Data Center. Topics include the technical architecture, how and why we chose EFS, our recommendations, and the lessons learned along the way.