Limited Replacement and Migration Controls
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Data storage hierarchies, such as a cache to main memory, main memory to peripheral equipment, high-speed peripheral equipment to low-speed peripheral equipment, and the like, involve the migration of data from a faster data storage unit to a slower data storage unit. Such migration can be caused by the well-known LRU (least recently used) replacement algorithms or can be part of a space management of a large number of peripheral data storage units. In either event, the migration of data from an upper or faster level of a data storage hierarchy to a slower or lower level requires applications of resourcing. In a given migration time period, it may be desired to limit the migration for enhancing overall performance.