Résif-DC, an Open Archival Information System

This article describes how Résif-DC complies to the OAIS model.

Functional entities

Ingest function

Only Résif-SI A-nodes have the right to ship data and metadata to Résif-DC. The A-nodes receive data from data producers and are responsible for data and metadata preparation and quality.

The ingestion process receives data and metadata from the A-nodes and verifies compliance with FDSN data and metadata standards and the overall consistency and homogeneity. If all checks pass, the ingestion process continues to the archival step and registers the new data to the data management function.

Each ingestion is traceable through a transaction object that includes information about the ingestion checks. The transactions information is made available to the A-node and the B-node through a web service.

Archival storage function

The data is stored on the hosting institute’s (University Grenoble Alps) storage service (SUMMER). This storage serviceprovides storage space and storage access with a level of performance as agreed contractually between Résif-DC and UGA.. Data is secured by two backup systems, one being off-site.

Data management function

Data stored in Résif-DC is referenced in a central data base, along whith all necessary information for data description and efficient data retrieval.

New data is also indexed and analyzed as post-ingestion processes in order to provide quality metrics (wfcatalog, seedpsd) and availability details (availability).

Résif-DC is bound to distribute the business metadata exactly as it has been submitted. But metadata content has an influence on data distribution and analyse, therefore it is stored and managed in a relational database.

Administration funcion

The administration of Résif-DC is held at two levels:

• Internally, for system engineering and project management, Résif-DC has a team composed of scientific experts and engineers.
• The Résif-SI Steering Committee oversees the overall functioning of Résif-SI, including budget, and organises the interaction with the scientific community. Résif-DC is in direct interaction with all A-nodes, and is part of the Résif-SI technical committee.

Preservation planning function

The mission of Résif-DC is to distribute long-term observation data and associated metadata. Long-term accessibility is guaranteed by the data and metadata formats international standard, published by the FDSN. With this preservation strategy, Résif-DC is able to publish data from 1986 onwards.

The evolving technologies in instruments and new user needs brings also evolution in data formats. Résif-DC participates actively to international efforts, within Orfeus, FDSN and RDA in order to prepare the next generation formats and access services for the users.

Access

The data and the metadata are distributed through the FDSN standardized services, namely FDSN-dataselect and FDSN-station. Résif-DC operates additional services to access data and metadata side products (waveform quality metrics, data availability, PSD). All web services are documented at https://ws.resif.fr

Two systems are in place to handle access to embargoed data for which access is temporarily restricted to an identified group of users. Either such users are granted privileges by password protected access after agreement with the Principal Investigator (Ask for access to restricted data) or alternatively access can be handled through the EIDA AAI system.