Invention Grant
- Patent Title: Physical media aware spacially coupled journaling and replay
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Application No.: US16727537Application Date: 2019-12-26
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Publication No.: US11481121B2Publication Date: 2022-10-25
- Inventor: Phillip Peterson , Leonid Baryudin , Daniel Sladic , Sujan Biswas
- Applicant: Amazon Technologies, Inc.
- Applicant Address: US NV Reno
- Assignee: Amazon Technologies, Inc.
- Current Assignee: Amazon Technologies, Inc.
- Current Assignee Address: US NV Reno
- Agency: Hogan Lovells US LLP
- Main IPC: G06F11/00
- IPC: G06F11/00 ; G06F3/06 ; G06F12/10 ; G06F11/10 ; G06F12/02 ; G06F11/14 ; G11C29/00 ; G11C29/44

Abstract:
An indirection mapping data structure can maintain a mapping between logical block addresses used by a host computer and physical data storage locations on a solid state drive. Changes to the indirection mapping data structure can be stored in journals. When a journal is full, the journal can be stored to a predetermined location on the cluster block determined based on the number of entries stored by the journal, leading to a number of journals scattered throughout the cluster block at predetermined locations. Each physical chunk of media, whether written with data or marked as defective is journaled. Such a journaling scheme, where the journal locations are predetermined and each physical chunk of media is journaled is referred to as physical media-aware spatially coupled journaling. During replay the spatially coupled journals can be retrieved from the predefined locations within cluster blocks and used to rebuild the indirection mapping data structure.
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