Hi everyone, We would like to share with you our thoughts on RocksDB in Ceph with main focus on efficient use of fast storage. Storage space provisioning for RocksDB is quite complex in Ceph as it includes several layers of abstraction. We highlight some problems while explaining how things are working under the hood. At the end, we propose several solutions to alleviate these problems. RocksDB in Ceph: column families, levels' size and spillover https://cf2.cloudferro.com:8080/swift/v1/AUTH_5e376cddf8a94f9294259b5f48d7b2... We'd love to hear your feedback. Thanks -- *Kajetan Janiak* C++ Engineer CloudFerro sp z o.o. office: Fabryczna 5A       *m:* +48 500 191 166 00-446 Warszawa, Poland    *e:* kjaniak@cloudferro.com <https://cloudferro.com/>