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Technical University of Crete
Technical University of Crete
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| URI | http://purl.tuc.gr/dl/dias/EAB887C8-1BF6-4116-885D-6F2B8B811DB6 | - |
| Identifier | https://doi.org/10.1145/66926.66955 | - |
| Language | en | - |
| Extent | 8 pages | en |
| Title | Retrieval performance vesus disc space utilization on worm optical discs | en |
| Creator | Christodoulakis Stavros | en |
| Creator | Χριστοδουλακης Σταυρος | el |
| Creator | Daniel Alexander Ford | en |
| Content Summary | Steady progress in the development of optical disc technology over the past decade has brought it to the point where it is beginning to compete directly with magnetic disc technology. WORM optical discs in particular, which permanently register information on the disc surface, have significant advantages over magnetic technology for applications that are mainly archival in nature but require the ability to do frequent on-line insertions.In this paper, we propose a class of access methods that use rewritable storage for the temporary buffering of insertions to data sets stored on WORM optical discs and we examine the relationship between the retrieval performance from WORM optical discs and the utilization of disc storage space when one of these organizations is employed. We describe the performance trade off as one of fast sequential retrieval of the contents of a block versus wasted space owing to data replication. A model of a specific instance of such an organization (a buffered hash file scheme) is described that allows for the specification of retrieval performance objectives. Alternative strategies for managing data replication that allow trade offs between higher consumption rates and better average retrieval performance are also described. We then provide an expected value analysis of the amount of disc space that must be consumed on a WORM disc to meet specified performance limits. The analysis is general enough to allow easy extension to other types of buffered files systems for WORM optical discs. | en |
| Type of Item | Πλήρης Δημοσίευση σε Συνέδριο | el |
| Type of Item | Conference Full Paper | en |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2015-10-05 | - |
| Date of Publication | 1989 | - |
| Subject | Automatic computers | en |
| Subject | Automatic data processors | en |
| Subject | Computer hardware | en |
| Subject | Computing machines (Computers) | en |
| Subject | Electronic brains | en |
| Subject | Electronic calculating-machines | en |
| Subject | Electronic computers | en |
| Subject | Hardware, Computer | en |
| Subject | computers | en |
| Subject | automatic computers | en |
| Subject | automatic data processors | en |
| Subject | computer hardware | en |
| Subject | computing machines computers | en |
| Subject | electronic brains | en |
| Subject | electronic calculating machines | en |
| Subject | electronic computers | en |
| Subject | hardware computer | en |
| Bibliographic Citation | S. Christodoulakis. D.A. Ford ,"Retrieval performance vesus disc space utilization on worm optical discs ",in 1989 ACM SIGMOD Intern.l Conf. on Manag. of Data ,pp. 306-314 .doi :10.1145/66926.66955 | en |
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