Reading files

In a read operation, a node acts as a manager to gather data from the other nodes and present it to the requesting client.

Because an Isilon cluster's coherent cache spans all the nodes, OneFS can store different data in each node's RAM. By using the internal InfiniBand network, a node can retrieve file data from another node's cache faster than from its own local disk. If a read operation requests data that is cached on any node, OneFS pulls the cached data to serve it quickly.

In addition, for files with an access pattern of concurrent or streaming, OneFS pre-fetches in-demand data into a managing node's local cache to further improve sequential-read performance.