Scheduling and data replication to improve tape jukebox performance

B.K. Hillyer, R. Rastogi, A. Silberschatz
1999 Proceedings 15th International Conference on Data Engineering (Cat. No.99CB36337)  
An increasing number of database applications require online access to massive amounts of data. Since large-scale storage systems implemented entirely on magnetic disk can be impractical or too costly for many applications, tape jukeboxes can provide an attractive solution. This paper shows how the performance of tape jukeboxes can be improved across a broad parameter space via a new scheduling algorithm and schemes for the placement and replication of hot data. We substantiate our claim by an
more » ... xtensive simulation study that quantifies the improvements obtained over a wide variety of workload characteristics. Our experiments suggest that system throughput increases when replicas of hot data are placed at the tape ends (not in the middle or at the beginning). As a result, the proposed replication techniques can be used to fill existing spare capacity in a tape jukebox, thus improving the performance of the jukebox "for free".
doi:10.1109/icde.1999.754969 dblp:conf/icde/HillyerRS99 fatcat:56flojscqfes3pjswc4dt73r3u