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6.5.1 Cache instance
Properties such as cache size, priority, and disk offload are configured independently for each cache instance. Objects that are stored in a particular cache instance are not affected by other cache instances.
As a system designer, you now have more granularity of control in terms of what happens to your cached objects. For example, one cache pool may not allow disk offload while the other does - allowing you to pin certain objects in a high speed in-memory cache and place other objects into a second cache, where there is greater potential of being offloaded to disk.
You may even separate objects by size, keeping smaller objects in one cache and larger objects in another. This helps prevent situations where a small object squeezes out a larger valuable object from the memory cache and onto the disk.
Objects that are stored in a particular cache instance are available to applications on other servers by accessing a cache instance of the same name. The two servers must be within the same replication domain to share data.