Adaptive look-ahead configuration for prefetching data in input/output operations based on request size and frequency

A system, comprising:

• a memory;
• and
• at least one processing device, coupled to the memory, operative to implement the following steps:
• in response to a request for at least one data item residing in a particular portion of a storage system that employs a cache memory, performing the following steps:
• estimating an earning value for the particular portion of the storage system based on an average size and a numerical value that estimates a frequency of past input/output requests for the particular portion of the storage system;
• calculating a quota for the particular portion of the storage system by normalizing the earning value for the particular portion of the storage system based on one or more earning values of one or more additional portions of the storage system;
• obtaining a size of a look-ahead window for the request based on the quota for the particular portion of the storage system over a prefetch budget assigned to the storage system;
• and
• moving the requested at least one data item and one or more additional data items within the look-ahead window from the storage system to the cache memory responsive to one or more of the requested at least one data item and the additional data items within the look-ahead window not being in the cache memory.

A computer program product, comprising a non-transitory machine-readable storage medium having encoded therein executable code of one or more software programs, wherein the one or more software programs when executed by at least one processing device perform the following steps:

• in response to a request for at least one data item residing in a particular portion of a storage system that employs a cache memory, performing the following steps:
• estimating an earning value for the particular portion of the storage system based on an average size and a numerical value that estimates a frequency of past input/output requests for the particular portion of the storage system;
• calculating a quota for the particular portion of the storage system by normalizing the earning value for the particular portion of the storage system based on one or more earning values of one or more additional portions of the storage system;
• obtaining a size of a look-ahead window for the request based on the quota for the particular portion of the storage system over a prefetch budget assigned to the storage system;
• and
• moving the requested at least one data item and one or more additional data items within the look-ahead window from the storage system to the cache memory responsive to one or more of the requested at least one data item and the additional data items within the look-ahead window not being in the cache memory.