H2020 IOStack

This document describes the progress of the IOStack toolkit until M24 and its software building blocks: Zoe, Konnector and Crystal. The second part of the document is focused on Crystal, the first SDS architecture for object storage, and describes how Crystal implements the filter abstraction to accommodate new storage optimizations that can be easily orchestrated via high-level policies. This deliverable also provides a first description and evaluation of results obtained from validation in use cases using different workloads.