Caching techniques using a mapping cache and maintaining cache coherency using hash values

Abstract

Caching techniques can include: receiving, from a host, a read I/O operation requesting to read from a logical address; determining whether a mapping cache includes a descriptor corresponding to the logical address; and responsive to determining the mapping cache includes the descriptor corresponding to the logical address, performing read hit mapping cache processing including: obtaining physical location information from the descriptor, wherein the physical location information identifies a physical location on non-volatile storage including first content stored at the logical address; reading, using the physical location information, the first content from the physical location; performing validation processing to validate the first content using a hash value included in the descriptor; and responsive to validation processing successfully validating the first content, returning the first content to the host.