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6.1 What is new in v6 of DynaCache
WebSphere Application Server provides Struts and Tiles caching, Web Services client and server caching, edge caching using Edge Side Includes, JSR 168 Portlet caching, servlet/JSP fragment caching, distributed map, and command caching. In WebSphere Application Server v6.1, WebSphere Dynamic Caching can be configured as an in-memory or as a disk cache, or both. The majority of the DynaCache improvements in WebSphere Application Server v6.1 are in the disk cache infrastructure.
The DynaCache service allows persisting objects to disk (specified by a file system location) so that objects evicted from the memory cache do not have to be regenerated by the application server. The disk caching technology was integrated as a overflow or spill-over cache.
However, the DynaCache designers have observed that the majority of commercial implementations treat the disk cache as the primary cache and the memory cache as a buffer. This has brought about a redesign in the disk cache and memory cache integration services and it is in this area where most of the infrastructure development changes occurred.