CERN, the European Organization for Nuclear Research, is running for several years a large OpenStack Cloud that helps thousands of scientists to analyze the data from the LHC.

In 2012, early in the design phase of the CERN Cloud we decided to use Nova Cells to enable the infrastructure to scale to thousands of nodes. Now with more than 280K cores spread across 70 cells that are hosted in two data centres we were faced with the challenge to migrate to Nova Cells V2 required in the Pike release.