R. J. Hanisch, F. Abney, M. Donahue, L. Gardner, E. Hopkins,
H. Kennedy, M. Kyprianou, J. Pollizzi, M. Postman, J. Richon, D. Swade,
J. Travisano, R. White
STScI
The Hubble Data Archive now contains in excess of 2.5 TB of HST data in a system of 4 optical disk jukeboxes. In addition to providing a WWW-based user interface (see Kimball et al., this conference) and removing a custom I/O processor (see Travisano et al., this conference), STScI has undertaken a high-level effort to improve the operating efficiency, reduce costs, and improve service to users of the archive. The HARP group is studying data compression, data segregation, large on-line disk caching, on-the-fly calibration, and migration to new storage media. In this paper we describe the results of our cost-benefit analysis of these and other options for re-engineering the HDA.