An Efficient Access Forwarding Method Based On Caches On Storage Nodes

In this paper, we discuss access forwarding schemes for the replication that achieve balanced access load distribu-tion for data replicas on multiple storage nodes. In parallel storage systems, it is significant to handle skew of access-request distribution. Although replication is commonly used to solve such problems, it decreases hit ratios of cache mem-ories on each storage nodes. We first obtain a result that it uses cache memories efficiently to forward accesses that target at data in less demand with a simple experiment. We also propose a method that uses hit ratios of each cache to recognize the popularity of data with low costs. Results of experiments with the method show that it helps the replica-tion use the limited cache space efficiently.