As a result of this, for ownCloud 9.0 we developed new Storage and Sharing APIs, which make it possible to write storage connectors that access and use advanced capabilities and metadata directly from the storage. One example is the EOS filesystem that is developed and used by CERN to store and manage their huge amount of scientific data. This filesystem can provide metadata, such as ETags, FileIDs, and more, which can be used by ownCloud 9.0 directly, avoiding the need to store this in the ownCloud database and providing the sought-after reduction in overhead. The option to leverage existing sharing capabilities of the storage layer (if available) is also possible, which removed the need to store sharing information in the central database.
— Open collaboration: ownCloud, CERN, and AARNET | Opensource.com https://opensource.com/business/16/3/cern-and-owncloud?sc_cid=70160000000q67aAAA
The new release of ownCloud 9 brings a number of new features including improvements to the API that allows CERN to use ownCloud as a frontend to their massive data store. Other new features beef up the Libre office based collaboration tools and add additional storage options.