In a clustered environment, the Maximum Elements on Disk cache setting is non-dynamic. The procedure you use to modify the value depends on whether your Terracotta Server Array is configured to use a persistence mode of permanent-store or temporary-swap-only (the default). The following sections describe how to increase the Maximum Elements on Disk size based on the persistence mode. For information about how to determine the persistence mode of the Terracotta Server Array, see the Ehcache product documentation for 2.8 at http://ehcache.org/documentation.