International Business Machines Corporation
Storing metadata in heterogeneous cache to improve I/O performance

Abstract:

A method for storing metadata in a cache comprising heterogeneous memory types is disclosed. The method stages data elements containing metadata into a lower performance portion of a cache. The cache includes the lower performance portion and a higher performance portion. In response to determining that the data elements are updated in the higher performance portion, the method records when the data elements were updated and invalidates the data elements in the lower performance portion. The method scans the lower performance portion for the data elements that are invalidated and re-stages, in the lower performance portion, the data elements that are invalidated and have not been updated in the higher performance portion in a last specified period of time. A corresponding system and computer program product are also disclosed.