You can help manage the peak write activity load for XRC-managed volumes by increasing the size of the storage control cache. Due to the large volume of data being moved, storage controls that support XRC may require significantly more cache memory than do those without this ability. The peak load for the storage control dictates the amount of cache that is required. Storage controls require more cache to prevent canceled XRC sessions as the peak load becomes heavier.
Depending on your application write I/O rate, the primary storage subsystem may require additional cache. Sophisticated applications with high write content can require as much as 6 GB or more of subsystem cache. The actual requirements depend on the application, and on the capability of the storage subsystem.