Cooperative cache and rotational positioning optimization (RPO) scheme for a direct access storage device (DASD)

摘要: A cooperative disk cache management and rotational positioning optimization (RPO) method for a data storage device, such as drive, makes decisions that decrease the total access times all data. The memory provides temporary either to be written or has been read from disk. Data are significantly lower than it is advantageous store in likely referenced again. For each block candidate cache, cost function calculated compared with analogous functions already cache. having lowest removed replaced higher function. C measures expected additional cost, time, of not storing given by C=(T d −T c )P, where T P an probability Access according RPO algorithm includes both seek latencies.