SPD Event Index

The SPD experiment has to collect large amount of data: up to trillion events (records of a collision results) have to be stored and analyzed, producing tens of petabytes of data. This information will be distributed between a number of computing sites on a various storage locations, with duplication to avoid data loss and improve performance. An information system is necessary to efficiently access all instances of the events, and the SPD Event Index is being developed for this purpose. It is a catalog of all events obtained from the detector or simulated, in all permanent instances of different formats and versions.