ESO's Next Generation Archive System

Details ESO's Next Generation Archive System ESO's Next Generation Archive System

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001msngr.106...11w&link_type=abstract

The Messenger, No. 106, p. 11 - 13 (December 2001)

Computer Science

2

Archive System

Scientific paper

Early in July 2001 ESO/DMD installed prototype versions of the archiving and buffering units of the Next Generation Archive System (NGAS) at the 2.2-m telescope in La Silla. The two units are the on-site part of an archive system we are currently testing for high data rate/high data volume instruments like the Wide Field Imager which is mounted at the 2.2-m telescope. The NGAS concept is built around two ideas: the use of cheap magnetic ATA-100 disks as the archiving media and a highly flexible and modular software called NG/AMS, NG Archive Management System. The main goals of the whole system are scalability in terms of data volume, but also the ability to support bulk data processing either by fast data retrieval or by opening the computing power of the archive for data-reduction close to the data themselves. In fact the NGAS scales in such a way that it is possible to process all the data in the archive within an almost constant time. In this article we present an overview of the NGAS concept, the NGAS prototype implementation and some of the experience we have made during the first month of operating the system in a real observational environment. We also present the infrastructure of the main archive which supports scalable, decentralised processing, both of which are essential for large-scale scientific programmes submitted to a Virtual Observatory.

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