TY - GEN
T1 - On the performance of D-redundant disk systems
AU - Bachmat, E.
PY - 2005/12/1
Y1 - 2005/12/1
N2 - In this paper we formally introduce the notion of a D-redundant disk system. The class of D-redundant systems includes the class of physically mirrored disks with D copies as well as the more recently introduced SR systems. We provide a very general lower bound on the average access time of any D-redundant system. Using the lower bound we show that that the SR systems of Yu et el. are within 15 percent of optimal performance. We also show how SR systems can be combined with anticipatory head movement policies (AHM) to provide systems which are optimal within 5 percent.
AB - In this paper we formally introduce the notion of a D-redundant disk system. The class of D-redundant systems includes the class of physically mirrored disks with D copies as well as the more recently introduced SR systems. We provide a very general lower bound on the average access time of any D-redundant system. Using the lower bound we show that that the SR systems of Yu et el. are within 15 percent of optimal performance. We also show how SR systems can be combined with anticipatory head movement policies (AHM) to provide systems which are optimal within 5 percent.
UR - http://www.scopus.com/inward/record.url?scp=33847245064&partnerID=8YFLogxK
U2 - 10.1109/QEST.2005.25
DO - 10.1109/QEST.2005.25
M3 - Conference contribution
AN - SCOPUS:33847245064
SN - 0769524273
SN - 9780769524276
T3 - QEST 2005 - Proceedings Second International Conference on the Quantitative Evaluation of SysTems
SP - 105
EP - 112
BT - QEST 2005 - Proceedings Second International Conference on the Quantitative Evaluation of SysTems
T2 - QEST 2005 - Second International Conference on the Quantitative Evaluation of SysTems
Y2 - 19 September 2005 through 22 September 2005
ER -