A full restartable CacheManager stores all of its cache data in server off-heap. A hybrid restartable CacheManager stores only some (explained in Configuring a Hybrid Cache section below) of its cache data in server off-heap. The off-heap tier in this scenario is backed by a disk, meaning that the entries in the off-heap tier are a subset of the entries in the disk, and the disk provides crash-resilience to the cache data. This has the following advantages:

Ehcache provides the flexibility of configuring hybrid at the CacheManager level. Thus, we could have full as well as hybrid cache managers on the same Terracotta Server.

In the subsequent sections, we'll refer to a hybrid restartable CacheManager simply as a hybrid CacheManager, because a non-restartable hybrid CacheManager does not exist.