US 10,503,415 B2Granted

Snapshot processing method and related device

AssigneeHuawei Technologies Co., Ltd.

InventorsLei Chen, Xiaohua Li

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Abstract

A snapshot processing method includes: receiving a snapshot request command, where the snapshot request command includes an ID of a primary LUN; determining the primary LUN according to the ID of the primary LUN, and setting a snapshot status of the primary LUN to a preparation state; sending a first snapshot command to a mirror storage device, where the first snapshot command includes the ID of the primary LUN, and the first snapshot command is used to notify the mirror storage device that the primary LUN is in the preparation state; receiving a response message, sent by the mirror storage device, of the first snapshot command, where the response message is used to notify the primary storage device that a mirrored LUN is in the preparation state; and performing snapshot processing on the primary LUN.

A method, comprising:

receiving, by a primary storage device, a snapshot request command, wherein the snapshot request command comprises an ID of a primary logical unit (LUN), wherein the primary storage device is comprised in a storage system, the storage system further includes a mirror storage device, both the primary storage device and the mirror storage device are in an operating mode, the primary storage device comprises the primary LUN, and the mirror storage device comprises a mirrored LUN of the primary LUN;
determining, by the primary storage device, the primary LUN, according to the ID of the primary LUN, and setting a snapshot status of the primary LUN to a preparation state, wherein the preparation state indicates that the primary storage device enters a preparation phase of performing a snapshot on the primary LUN;
sending, by the primary storage device, a first snapshot command to the mirror storage device, wherein the first snapshot command comprises first service data and the ID of the primary LUN, notifies the mirror storage device that the primary LUN is in the preparation state, and instructs the mirror storage device to write the first service data to the mirror storage device;
after sending the first snapshot command, receiving, by the primary storage device and from the mirror storage device, a first response message notifying the primary storage device that the mirrored LUN is in the preparation state;
performing, by the primary storage device, the snapshot on the primary LUN;
after completing the performing the snapshot on the primary LUN, sending, by the primary storage device to the mirror storage device, a snapshot complete command comprising second service data, the snapshot complete command notifying the mirror storage device that the primary storage device has completed the snapshot on the primary LUN and instructing the mirror storage device to write the second service data to the mirror storage device;
and
after the sending the snapshot complete command, receiving, by the primary storage device from the mirror storage device, a second response message indicating that the mirror storage device has completed the snapshot on the mirrored LUN.

5 more elements

Facts

Application

15/498,832Filed 27 Apr 2017 · continuation

Priority

CN 2014 1 085410531 Dec 2014

Published

US 2017/0228181 A110 Aug 2017

Granted

10 Dec 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

G06F 3/0619
Improving the reliability of storage systems: in relation to data integrity, e.g. data losses, bit errors
G06F 11/2056
Where persistent mass storage functionality or persistent mass storage control functionality is redundant: by mirroring
G06F 3/061
Specifically adapted to achieve a particular effect: improving I/O performance
G06F 3/0634
Configuration or reconfiguration of storage systems: by changing the state or mode of one or more devices

Abstract

Claims22