If you anticipate that your Integration Server sessions will use a large portion of the cache, you should increase the cache size on each server in the cluster. You can increase the on-heap cache size by modifying the Maximum Elements on Disk setting. Or, if you are using BigMemory, you can modify the Maximum Off-Heap setting. For information about how to increase the Maximum Elements On Disk size, see Increasing the Maximum Elements on Disk Size. For information about increasing the Maximum Off-Heap size, see the Ehcache chapter of the webMethods Integration Server Administrator’s Guide.