Teradata Us, Inc.

Wayne R Boyle

Donald Raymond Pederson

Philip Jason Benton

Gary Lee Boggs

Steven Bart Cohen

Eric M Shank

Albert O Lam

A combination of non-persistent-based and persistent-based schemes are used to effectively manage volatile storages which are conventionally managed solely by using non-persistent schemes (e.g., LRU schemes in cache memory). Generally, the persistent-based schemes can be based on persistent information associated with a non-volatile storage environment (e.g., persistent data temperatures associated with data stored in non-volatile storages). In this context, a persistent-based scheme can, for example, be effectively used in addition or combination with a conventional scheme provided for volatile memory. By way of example, a LRU scheme can be combined with a scheme based on persistent data temperatures in order to more effectively manage cache memory provided to enhance the performance of a system. As another example, a LRU, a LFU aging schemes can be combined with a scheme based on persistent data temperatures.

Management of data in multi-storage systems that can include non-volatile and volatile storages

Techniques for management of data in multi-storage systems allow managing storage of data in one of the multiple storages (e.g., a HDD) based on the information associated with the storage and/or access of data (e.g., logical hits of data in a cache memory) in another one of the storages (e.g., a cache memory) of the multi-storage system. In one aspect, information associated with storage and/or access of data in a volatile (or non-persistent) storage environment is provided for managing the storage of data in a non-volatile (or persistent) storage environment. By way of example, data access information associated with a volatile storage environment (e.g., logical hits of data in a cache) can be effectively communicated to a non-volatile storage environment, for example, as information that can be indicative of data temperatures. Moreover, the information obtained from a non-volatile storage environment can be persistently stored for and/or in the non-volatile environment (e.g., stored as persistent data temperatures), thereby preserving and allowing the information to be used to more effectively manage the storage of the data in the non-volatile storage itself and/or the multi-storage system including the (volatile storage) as a whole.

Techniques for management of data in multi-storage systems allow managing storage of data in a first storage of multiple storages in a multi-storage system based on the temperature of the data (or data temperature) obtained for a second storage of the multiple storages in a multi-storage system. For example, in a multi-storage system that includes at least one non-volatile storage (e.g., one or more HDDs) and at least one volatile storage (e.g., a cache memory device), the storage of a particular data portion (e.g., a storage unit of data) for the at least one volatile storage can be managed based on a temperature of the data determined for the non-volatile storage. By way of example, persistent temperatures used for management of data in a non-volatile storage system (e.g., a multi-tier storage of a database system) can be used to effectively manage the storage of the data in a cache memory that is typically provided for improving performance by keeping data that is likely to be used in the cache memory. As a result, overall performance of a system can be further enhanced by allowing persistent temperature measurements to be used in managing cache memory, instead of solely relying on conventional techniques for caching data which typically do not take into account persistent temperatures associated with a non-volatile storage environment.

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San Diego, CA, United States of America

Wayne R Boyle