Invention Grant
- Patent Title: Efficient recovery of erasure coded data
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Application No.: US16460404Application Date: 2019-07-02
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Publication No.: US10795789B2Publication Date: 2020-10-06
- Inventor: Emalayan Vairavanathan , Dheeraj Raghavender Sangamkar , Song Guen Yoon , Yi Zhang
- Applicant: NetApp, Inc.
- Applicant Address: US CA Sunnyvale
- Assignee: NETAPP, INC.
- Current Assignee: NETAPP, INC.
- Current Assignee Address: US CA Sunnyvale
- Agency: Haynes and Boone, LLP
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@5672cdbe
- Main IPC: G06F11/20
- IPC: G06F11/20 ; G06F11/10 ; H04L29/08 ; G06F3/06 ; G06F11/14 ; G06F3/12 ; H04L29/14 ; H03M13/15 ; G06F9/50

Abstract:
To efficiently recover from a multiple storage node failure, a storage node concurrently restores data fragments to the multiple failed storage nodes, as opposed to restoring each node individually. In the VCS based storage technique, storage nodes are restored as part of an ECG repair process. For each ECG being repaired, a storage node performing the restoration process reads data fragments from active nodes in the ECG and generates new data fragments to replace any lost data fragments. The node then stores one of the new data fragments across each of the failed storage nodes. By concurrently restoring data fragments to each failed storage node, the data fragments needed to repair each ECG are only read once, thereby preserving disk operations and network bandwidth.
Public/Granted literature
- US20200034256A1 EFFICIENT RECOVERY OF ERASURE CODED DATA Public/Granted day:2020-01-30
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