An area of temporary volatile storage (RAM) on the that has a faster access time than the actual physical disk media. By using cache, you can increase overall application performance because:
Data blocks for a read from the may already be in the cache from a previous operation, eliminating the need for physical disk access.
Write data is written initially to the cache, which frees the application to continue.
For more information, see Changing Storage Array Cache Settings on the How To tab.