Cross-host sparse file copying method and device, equipment and storage medium

Abstract

The invention discloses a cross-host sparse file copying method, device and equipment and a computer storage medium. In the scheme, a source host reads metadata information of a to-be-copied target sparse file and then sends the metadata information to a target host, and the target host creates the to-be-filled sparse file by utilizing the metadata information; and the source host reads the targetsparse file, and sends the valid data determined in the reading process and the offset information of the valid data to the destination host, so that the destination host reconstructs the corresponding sparse file in the to-be-filled sparse file by using the valid data and the offset information. It can be seen that after the source host sends the effective data and the offset information of thesparse file to the target host, the target host can reconstruct the corresponding sparse file through the effective data and the offset information, and therefore cross-host copying of the sparse fileis achieved; moreover, only effective data is copied when the sparse file is copied, so that the file copying rate can be increased.

Description

technical field [0001] The present invention relates to the technical field of data processing, and more specifically relates to a method, device, equipment and computer storage medium for copying sparse files across hosts. Background technique [0002] When the user applies for storage space, no data is written into the space at the beginning. When the data is actually written, the operating system gradually allocates space. Then this file will look very large, but the actual occupied space is very small, and the actual occupied space is only related to the amount of data filled by the user. Such a file is a sparse file. The place in the file that is not filled with data is called a hole, that is, a hole. Although these holes are not filled with data, when the operating system accesses the data in these locations, the file system will return the default value of 0. At present, when a user copies a sparse file across hosts, the entire sparse file including invalid data wi...

AI Technical Summary

Problems solved by technology

At present, when a user copies a sparse file across hosts, the entire sparse file including invalid data will be copied, that is, when a sparse file is copied across hosts, even the empty part will be copied, which is equivalent to copying a bunch of invalid data 0, resulting in a cross-host copy When files are copied, the copy rate is reduced

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