Introduction to redundant arrays of inexpensive disks-英文文献.pdfVIP

A Casefor RedundantArrays of InexpensiveDisks (RAID) Davtd A Patterson, Garth Gibson, and Randy H Katz ComputerSaenceD~v~smn Departmentof ElecmcalEngmeermgandComputerSclencea 571EvansHall Umversityof Cabforma Berkeley.CA 94720 (partrsl@WF -kY du) Abstract Increasmg performance of CPUs and memorres wrll be ureof magneuctik technology1sthe growthm the maxnnumnumberof squandered lf not matched by a sunrlm peformance ourease m II0 Whde bits that can be storedper squaremch, or the bits per mch m a track the capactty of Smgle Large Expenstve DT (SLED) has grown rapuily, umesthe numberof tracks per mch Called MA D , for maxunal area1 the performance rmprovement of SLED has been modest Redundant density,the “Fmt Law m Disk Density”predicts~rank87] Arrays of Inexpensive Disks (RAID), based on the magnetic duk MAD = lo(Year-1971)/10 technology developed for personal computers, offers an attractive alternattve IOSLED, promtang onprovements of an orr of mogme m pctformance,rehabdlty, power consumption,and scalalnlrty Thu paper Magnettcdd technologyhasdoubledcapacityandhalvedpnceeverythree rntroducesfivclevelsof RAIDS, grvmg rheu relative costlpetfotmance, and years, m hne with the growth rate of semiconductormemory, and m