Handling unclean shutdowns for a system having non-volatile memory

Patent metadata

Field	Value
Publication number	US-9104614-B2
Application number	US-201113234934-A
Country	US
Kind code	B2
Filing date	Sep 16, 2011
Priority date	Sep 16, 2011
Publication date	Aug 11, 2015
Grant date	Aug 11, 2015

Abstract

Systems and methods are disclosed for handling unclean shutdowns for a system having non-volatile memory (“NVM”). In some embodiments, the system can leverage from information obtained from index pages in order to efficiently reconstruct logical-to-physical mappings after an unclean shutdown event. In other embodiments, the system can reconstruct logical-to-physical mappings by leveraging from context information stored in a NVM. In further embodiments, context information can be used in conjunction with index pages to reconstruct logical-to-physical mappings after an unclean shutdown.

First claim

What is claimed is:

1. A method for recovering from a device failure, the method comprising:
detecting that an unclean shutdown event has occurred;
scanning a plurality of index pages of a non-volatile memory (“NVM”) for ages of the plurality of index pages, said plurality of index pages being stored in said NVM, and wherein the scanning the plurality of index pages potentially avoids scanning every data block of the NVM;
comparing the ages of the plurality of index pages with…

Assignees

• Khmelnitsky Vadim
• Apple Inc

Inventors

• Khmelnitsky Vadim

Classifications

• G06F12/0246

  Physics · mapped topic

• G06F11/1435

  Physics · mapped topic

• G06F2201/835

  Physics · mapped topic

• G06F11/1417 Primary

  Physics · mapped topic

• G06F2212/7201

  Physics · mapped topic