US 11,531,590 B2Granted

Method and system for host-assisted data recovery assurance for data center storage device architectures

AssigneeWestern Digital Technologies, Inc.

InventorsDaniel Lee Helmick, Cory James Peterson, Jay Sarkar

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Abstract

A method of error management includes, in response to a read request for first data from a first storage device of a plurality of storage devices under one or more common data protection schemes, receiving a read uncorrectable indication regarding the first data, obtaining uncorrected data and metadata of an LBA associated with the first data, and obtaining the same LBA from one or more other storage devices of the plurality. The method further includes comparing the uncorrected data with the data and metadata from the other storage devices, speculatively modifying the uncorrected data based, at least in part, on the other data to create a set of reconstructed first data codewords, and, in response to a determination that one of the reconstructed first data codewords has recovered the first data, issuing a write_raw command to rewrite the modified data and associated metadata to the first storage device.

Claims20

Dependent claims

A method of error management for data storage and solid-state storage devices (SSDs), the method comprising:

in response to a read request for first data from a first storage device of a plurality of storage devices under one or more common data protection schemes, receiving a read uncorrectable indication regarding the first data;
issuing a read_raw command to obtain uncorrected data and metadata of a logical block address (LBA) associated with the first data;
obtaining the same LBA, or the same first data stored at another LBA, from one or more other storage devices of the plurality of storage devices, wherein issuing the read_raw command further comprises retrieving and characterizing at least one of:
an error mode of the first storage device;
an error mode for a customer who sent the first data that was written to the first storage device;
an error mode of the one or more other storage devices;
a setting of a NAND storing the first data of the first storage device;
and
a setting of another NAND of the one or more other storage devices;
comparing the uncorrected data with the same LBA, or the same first data stored at the another LBA, from the one or more other storage devices and the metadata of the same LBA, or the same first data stored at the another LBA, from the one or more other storage devices;
speculatively modifying the uncorrected data based at least in part on the same LBA, or the same first data stored at the another LBA, from the one or more storage devices to create a set of reconstructed first data codewords;
and
in response to a determination that one of the reconstructed first data codewords has recovered the first data, issuing a write_raw command to rewrite the speculatively modified uncorrected data and associated metadata to the first storage device.

10 more elements

A non-volatile data storage device, comprising:

a storage device host configured to:
receive a read uncorrectable event response for a first codeword (CW) stored in the storage device;
issue a read_raw command for the first CW and a read_raw_extended command for each of other CWs protected in a data protection stripe that includes the first CW, wherein issuing the read_raw command further comprises retrieving and characterizing at least one of:
an error mode of the storage device;
an error mode for a customer who sent the first CW that was written to the storage device;
an error mode of one or more other storage devices;
a setting of a NAND storing the first CW of the storage device;
and
a setting of another NAND of the one or more other storage devices;
construct a pseudo_read_raw result for the first CW from each of the other CWs and the data protection stripe;
and
using the pseudo_read_raw result, construct a set of possible replacement CWs for the first CW and push one or more elements of the set to the storage device.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/739,098Filed 9 Jan 2020 · us provisional application
Priority: 17 Sep 2019
Published: US 2021/0081273 A118 Mar 2021
Granted: 20 Dec 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

G06F 11/108
Parity data used in redundant arrays of independent storages, e.g. in RAID systems: parity data distribution in semiconductor storages, e.g. in SSD
G06F 9/30189
Instruction operation extension or modification: according to execution mode, e.g. mode flag
G06F 9/4881
By program, e.g. task dispatcher, supervisor, operating system: scheduling strategies for dispatcher, e.g. round robin, multi-level priority queues
G06F 11/0772
Error or fault reporting or storing: means for error signaling, e.g. using interrupts, exception flags, dedicated error registers