Prototyping of CMS storage management

Abstract

This report concludes the following. In essence, use of Objectivity for physics workloads does not introduce performance penalties compared to existing systems. Through its clustering directives, Objectivity allows for fine-grained control over physical data placement, so that optimisation strategies usable in a flat-file system can be adopted if necessary. RD45 identified Objectivity as the most suitable product for high energy physics needs, with Versant [48] as a commercial fall-back solution. Many other products explored did not have an architecture that would scale to meet high energy physics needs.