Speaker
Description
The recent commissioning of CERN’s Prevessin Data Centre (PDC) brings the opportunity for multi-datacentre Ceph deployements, bringing advantages for business continuity and disaster recovery. However, the simple extension of a single cluster across data centres is impractical due to the impact of latency on Ceph’s strong consistency requirements. This paper reports on our research towards building a multi datacentre Ceph deployment in production. Due to the nature of different transaction semantics for blocks, objects and files, geo-distributing a ceph cluster needs a different approach for each protocol in use. This paper will detail the challenges with Ceph across data centres, the various solutions we evaluated and a roadmap for the future at CERN.
