Systems and methods for cache endurance

US9767032B2 · kind B2 · utility

Assignee

• Sandisk Technologies, Inc. · US

Inventors

• Nisha Talagala · Fremont, US
• Ned D. Plasson · Salt Lake City, US
• Jingpei Yang · San Jose, US
• Robert B. Wood · Detroit, US
• Swaminathan Sundararaman · San Jose, US
• Gregory Nelson Gillis · Riverton, US

Key dates

• Filing date: Dec 5, 2013
• Grant date: Sep 19, 2017
• Expiry date: Dec 5, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F2212/7205
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A cache and/or storage module may be configured to reduce write amplification in a cache storage. Cache layer write amplification (CLWA) may occur due to an over-permissive admission policy. The cache module may be configured to reduce CLWA by configuring admission policies to avoid unnecessary writes. Admission policies may be predicated on access and/or sequentiality metrics. Flash layer write amplification (FLWA) may arise due to the write-once properties of the storage medium. FLWA may be reduced by delegating cache eviction functionality to the underlying storage layer. The cache and storage layers may be configured to communicate coordination information, which may be leveraged to improve the performance of cache and/or storage operations.