Memory store – Heap memory that holds a copy of the hottest subset of data from the off-heap store. Subject to Java GC.Memory store – Heap memory that holds a copy of the hottest subset of data from the off-heap store. Subject to Java GC.Off-heap store – Limited in size only by available RAM. Not subject to Java GC. Can store serialized data only. Provides overflow capacity to the memory store.Disk store – Backs up in-memory data and provides overflow capacity to the other tiers. Can store serialized data only.