Distributed storage medium management for heterogeneous storage media in high availability clusters

摘要

A high availability cluster and method of storage medium management in such high availability cluster. A number k of nodes belonging to the cluster, where k≧2 and includes a master node, are provisioned with high-access-rate and low-access-rate storage media. A file is written to the high-access-rate medium of a serving node selected from among k−1 nodes excluding the master node. The file is also written to low-access-rate medium of each of k−2 nodes excluding the master node and the serving node. A distributed storage medium management protocol supervises file migration from the low-access-rate medium of a back-up node to the high-access-rate medium of the back-up node upon disruption of file availability on the serving node. File rebalancing relies on parameters including popularity, write- and read-requests, capacity, processing load or cost.