Sakai is a Java-based, service-oriented web application that provides a variety of capabilities supporting teaching and learning, portfolios, research, and ad-hoc project collaboration. Sakai is typically deployed using Apache Tomcat as its servlet container and scalability is achieved by running multiple instances of Tomcat in a clustered environment, each deploying a copy of Sakai. It integrates with a variety of external authentication services including CAS, Kerberos, LDAP, Shibboleth and WebAuth. A single database, usually MySQL or Oracle, provides a transactional store of information while file storage is typically delegated to NAS or SAN solutions. In most production settings, Sakai relies on a back-end student information system (SIS) to provide it with student and course information, which Sakai consults via provider APIs.
With the advent of the Sakai 11 series, official Community support for Sakai 2.9 ceases. Organizations running Sakai 2.9 (and earlier versions) are strongly encouraged to upgrade to the Sakai 11 series in order to take advantage the most robust community support and most current security patches. Sakai 10 is still supported at this time.