Cloud technologies allow easy load balancing between different tasks and projects. From
the viewpoint of the data analysis in the ALICE experiment, cloud allows to deploy software
using Cern Virtual Machine (CernVM) and CernVM File System (CVMFS), to run different
(including outdated) versions of software for long term data preservation and to dynamically
allocate resources for different computing activities, e.g. grid site, ALICE Analysis Facility
(AAF) and possible usage for local projects or other LHC experiments.
We present a cloud solution for Tier-3 sites based on OpenStack and Ceph distributed
storage with an integrated XRootD based storage element (SE). One of the key features of the
solution is based on idea that Ceph has been used as a backend for Cinder Block Storage service
for OpenStack, and in the same time as a storage backend for XRootD, with redundancy and
availability of data preserved by Ceph settings.
For faster and easier OpenStack deployment was applied the Packstack solution, which is
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