Data copying method, device and system and medium

Abstract

The invention discloses a data pair copying method, device and system and a medium, and the method comprises the steps: reading data from first storage equipment, and obtaining first target data; judging whether second target data exists in the first target data or not, wherein the second target data is data of a first preset size and in a preset format, and the preset format is a data format of return data corresponding to a storage space in which data is not written in the first storage device; if the second target data exists in the first target data, filtering the second target data from the first target data to obtain valid data; and writing the valid data into a second storage device. Thus, useless data can be filtered, only valid data is written, the data writing amount is reduced,the copying time is shortened, meanwhile, the garbage collection triggering frequency is reduced, and therefore the user experience is improved.

Description

technical field [0001] The present application relates to the field of storage technology, and in particular to a data copy method, device, system and medium. Background technique [0002] PC (that is, personal computer, personal computer) complete machine manufacturers mass-produce PC complete machines, and install the operating system on the complete machines before leaving the factory. The traditional steps for installing an operating system are as follows: 1. Connect the hard disk to the PC as a local hard disk of the PC. 2. Insert the mobile storage device (such as CD / U disk) with the operating system installation program into the whole machine to be installed with the operating system. 3. Execute the operating system installation program on the mobile storage device, and install the operating system on the local hard disk of the PC. 4. Do steps 1-3 on all PCs. This kind of installation procedure was often used in early PC complete machine or PC assembly machine shop...

AI Technical Summary

Problems solved by technology

However, for the master disk, the data written by the operating system installation program to the master disk may be less than 30GB; but for the slave disk, the copy will completely copy and clone the entire data of the master disk to the slave disk, resulting in The amount of data is actually the storage space of the entire master disk

Therefore, this copy method will bring two problems: 1. The amount of data copied to the slave disk is far greater than the amount of data actually written to the master disk, and the increase in the amount of data will lead to longer copying time

2. For the slave disk, the data copied in the past is all valid data, so the valid data of the slave disk increases, and the slave disk just shipped is full of valid data, which causes the garbage collection mechanism of the solid-state hard disk to trigger earlier , the amount of valid data moved by garbage collection increases, and the amount of invalid space recovered is relatively small, which increases the time to identify valid data and move valid data. At the same time, the garbage collection mechanism of solid-state drives will be triggered more frequently, which will affect the user experience.

Images