Terracotta Ehcache 10.7 | Ehcache API Developer Guide | Hybrid Caching | General Notes on Configuring Hybrid
 
General Notes on Configuring Hybrid
*Permissible values of dataPercent are 0 through 99, both values included.
*dataPercent values are not allowed for full caches. If an attempt to configure a full Cache with any dataPercent value is made, the following Exception is thrown:

org.terracotta.entity.ConfigurationException:
dataPercent attribute has no meaning for a clustered tier manager
with FULL restartable offheap mode