Invention Grant
- Patent Title: NVRAM data organization using self-describing entities for predictable recovery after power-loss
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Application No.: US14839667Application Date: 2015-08-28
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Publication No.: US09619160B2Publication Date: 2017-04-11
- Inventor: Kayuri H. Patel , Hari Shankar
- Applicant: NetApp, Inc.
- Applicant Address: US CA Sunnyvale
- Assignee: NetApp, Inc.
- Current Assignee: NetApp, Inc.
- Current Assignee Address: US CA Sunnyvale
- Agency: Cesari and McKenna, LLP
- Main IPC: G06G3/06
- IPC: G06G3/06 ; G06F3/06 ; G06F12/02 ; G06F11/14

Abstract:
In one embodiment, a node coupled to a plurality of storage devices executes a storage input/output (I/O) stack having a plurality of layers including a persistence layer. A portion of non-volatile random access memory (NVRAM) is configured as one or more logs. The persistence layer cooperates with the NVRAM to employ the log to record write requests received from a host and to acknowledge successful receipt of the write requests to the host. The log has a set of entries, each entry including (i) write data of a write request and (ii) a previous offset referencing a previous entry of the log. After a power loss, the acknowledged write requests are recovered by replay of the log in reverse sequential order using the previous record offset in each entry to traverse the log.
Public/Granted literature
- US20150370498A1 NVRAM DATA ORGANIZATION USING SELF-DESCRIBING ENTITIES FOR PREDICTABLE RECOVERY AFTER POWER-LOSS Public/Granted day:2015-12-24
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