Abstract
Implementation of the CMS policy on long-term data preservation, re-use and open access has started. Current practices in providing data additional to published papers and distributing simplified data-samples for outreach are promoted and consolidated. The first measures have been taken for analysis and data preservation for the internal use of the collaboration and for open access to part of the data. Two complementary approaches are followed. First, a virtual machine environment, which will pack all ingredients needed to compile and run a software release with which the legacy data was reconstructed. Second, a validation framework, maintaining the capability not only to read the old raw data, but also to reprocess them with an updated release or to another format to help ensure long-term reusability of the legacy data.
Highlights
CMS has approved a data preservation, re-use and open access policy[1, 2], which motivates and defines the CMS approach to preservation of the data and access to them at various levels of complexity
Analysis Object Data (AOD) alone is sufficient for most kinds of physics analysis and is the data format in which the CMS experiment stores the legacy data for long-term preservation purposes
Collision and simulated data are being reprocessed to a legacy data set in AOD format with a single CMS Software version
Summary
CMS has approved a data preservation, re-use and open access policy[1, 2], which motivates and defines the CMS approach to preservation of the data and access to them at various levels of complexity. AOD alone is sufficient for most kinds of physics analysis and is the data format in which the CMS experiment stores the legacy data for long-term preservation purposes.
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