Invention Application
US20110208995A1 READ-MODIFY-WRITE PROTOCOL FOR MAINTAINING PARITY COHERENCY IN A WRITE-BACK DISTRIBUTED REDUNDANCY DATA STORAGE SYSTEM
有权
用于在写回分配冗余数据存储系统中维持奇偶校验的读修改 - 写协议
- Patent Title: READ-MODIFY-WRITE PROTOCOL FOR MAINTAINING PARITY COHERENCY IN A WRITE-BACK DISTRIBUTED REDUNDANCY DATA STORAGE SYSTEM
- Patent Title (中): 用于在写回分配冗余数据存储系统中维持奇偶校验的读修改 - 写协议
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Application No.: US12710123Application Date: 2010-02-22
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Publication No.: US20110208995A1Publication Date: 2011-08-25
- Inventor: James L. Hafner , Prashant Pandey , Tarun Thakur
- Applicant: James L. Hafner , Prashant Pandey , Tarun Thakur
- Applicant Address: US NY Armonk
- Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
- Current Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
- Current Assignee Address: US NY Armonk
- Main IPC: G06F12/16
- IPC: G06F12/16 ; G06F11/14 ; G06F11/00 ; G06F12/02

Abstract:
Data storage reliability is maintained in a write-back distributed data storage system including multiple nodes, each node comprising a processor and an array of failure independent data storage devices. Information is stored as a set of stripes, each stripe including a collection of multiple data strips and associated parity strips, the stripes distributed across multiple corresponding primary data nodes and multiple corresponding parity nodes. A primary data node maintains the data strip holding a first copy of data, and each parity node maintains a parity strip holding a parity for the multiple data strips. A read-modify-write parity update protocol is performed for maintaining parity coherency, the primary data node driving parity coherency with its corresponding parity nodes, independently of other data nodes, in order to keep its relevant parity strips coherent.
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