Abstract
The CMS Collaboration has recently commissioned a new compact data format, named NANOAOD, reducing the per-event storage space requirement to about 1-2 kB. This represents a factor 20 reduction in storage space compared to the MINIAOD data format used previously for physics analysis at CMS. We envisage that the information stored in the NANOAOD data format is sufficient to support the majority of CMS physics analyses. NANOAOD also facilitates the dissemination of analysis methods and the automation of standard workflows for deriving conditions and object calibrations. The latest developments of this project will be presented.
Highlights
NANOAOD is a new data format recently commissioned by the CMS Collaboration [1]
Such level allows to reduce the number of copies of MINIAOD files on disk, and to free up CPU processing power that was previously consumed by custom Ntuple production
The frequency of the centrally managed conversion campaigns from MINIAOD to NANOAOD format is foreseen to increase in the future
Summary
NANOAOD is a new data format recently commissioned by the CMS Collaboration [1]. The NANOAOD format aims to reduce the growing demands on disk capacity and CPU resources, to simplify increasingly complex data analysis recipes, and avoid sophisticated dependencies on CMS software when performing physics analysis. A prototype of the new data format was first presented in [3]. The main principle that is followed in the design of the NANOAOD format is to satisfy the requirements of as many physics analyses as possible, while keeping the event size to a minimum. More details about the design rationale and implementation of the format, impact on physics analysis and software models, and future goals are presented in the following
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