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The OneFS caching infrastructure design is predicated on aggregating the cache present on each node in a cluster into one globally accessible pool of memory. This allows all the nodes’ memory cache to be available to every node in the cluster. Remote memory is accessed over an internal interconnect and has much lower latency than accessing hard disk drives.
The OneFS caching subsystem is coherent across the cluster. This means that if the same content exists in the private caches of multiple nodes, this cached data is consistent across all instances.
OneFS uses up to three levels of read cache, plus an NVRAM-backed write cache, or coalescer. These, and their high-level interaction, are illustrated in the following diagram
This feature enables fast iterative analytics where the data is alternately ready from and written to disk.