SUMMARY We describe the organization of a general purpose data archival system for Write-Once, Read-Many (WORM) optical disks. The system has been designed for large-scale and long-term data storage and retrieval. The archival system is independent of the operating system, flat, self-consistent, does not use any write cache on magnetic disk, and allows the exploitation of auxiliary information on magnetic disk, which can be rebuilt immediately in case of a crash, to speed up file retrieval. A library in C language, called pODLIB, has been implemented as a portable interface to the archival system.

An operating system independent WORM archival system

The implementation at the ESO/ESA ST-ECF in Munich of the Data Management Facility (DMF) for the scientific archive of the Hubble Space Telescope (to be put in orbit within 1987) is described. The DMF is using a relational database machine for the Catalogue and optical disks for the Archive; these systems are accessed through an External Interface (EIF) to put data in, and a User Interface (UIF) to retrieve data. The architecture of the UIF is described in detail.

The European Scientific Data Archive for the Hubble Space Telescope

Modem astronomical data is now either produced directly in digital form or converted from a high resolution analog medium to digital form. These data are therefore best conserved and handled with computer techniques.

Data Storage Technology: Coping with the Evolution

HST observation of the inner coma of 2060 chiron

Nowadays, “archiving” data is a widely used expression in astronomy. A number of reasons explain it, but the more obvious ones are the cost and scarcity of large modern astronomical instruments. The existence of this book is also clue to the growing importance of this field.

Data Storage Technology for Astronomy

The paper describes the European HST Science Data Archive. Particular attention is given to the flow from the HST spacecraft to the Science Data Archive at the Space Telescope European Coordinating Facility (ST-ECF); the archiving system at the ST-ECF, including the hardware and software system structure; the operations at the ST-ECF and differences with the Data Management Facility; and the current developments. A diagram of the logical structure and data flow of the system managing the European HST Science Data Archive is included.

The European HST science data archive

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The European HST science data archive