A snapshot volume writing method and dependent snapshot system
A snapshot and internal snapshot technology, which is applied to the redundancy in the operation for data error detection and response error generation, etc., which can solve the problems of snapshot data destruction and snapshot data loss.
Active Publication Date: 2019-03-15
INSPUR BEIJING ELECTRONICS INFORMATION IND
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Even in the case of supporting snapshot volume writing, only new data is used to directly replace and overwrite the old data on a certain data block of the snapshot volume, which will cause the original snapshot data on the snapshot volume to be destroyed, resulting in Loss of original snapshot data
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[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0037] The embodiment of the present invention discloses a snapshot volume writing method, which is applied to a snapshot-dependent system; see figure 1 As shown, the method includes:
[0038] Step S101: Obtain the write request information for performing data update operations on the target data block of the snapshot volume. The write request information includes the external snapshot ID of the snapshot volume and the block number information of the target da...
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The invention discloses a snapshot volume writing method and a dependent snapshot system. The method comprises the steps as follows: writing request information for carrying out a data updating operation on a target data block of a snapshot volume is obtained; the writing request information comprises an external snapshot ID of the snapshot volume and block number information of the target data block; when the data updating operation is the first data updating operation carried out on the target data block, a new data block is created on a data volume; the updating data corresponding to the data updating operation are written into the new data block; a corresponding relationship among an internal snapshot ID associated with the external snapshot ID, the block number information of the target data block and the block number information of the new data block is recorded; and when the data updating operation is not the first data updating operation carried out on the target data block, the updating data corresponding to the data updating operation are directly written into the new data block, so that the integrity of original snapshot data is also ensured when a writing operation on the snapshot volume is achieved.
Description
technical field [0001] The invention relates to the technical field of snapshots, in particular to a method for writing snapshot volumes and a system dependent on snapshots. Background technique [0002] Currently, in traditional systems that rely on snapshots, snapshot volumes are usually read-only and rarely support write operations. Even in the case of supporting snapshot volume writing, only new data is used to directly replace and overwrite the old data on a certain data block of the snapshot volume, which will cause the original snapshot data on the snapshot volume to be destroyed, resulting in Loss of original snapshot data. [0003] From the above, it can be seen that how to ensure the integrity of the original snapshot data while writing to the snapshot volume that relies on the snapshot system is an urgent problem to be solved. Contents of the invention [0004] In view of this, the object of the present invention is to provide a snapshot volume writing method ...
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IPC IPC(8): G06F11/14
Inventor 穆裕孟宪伟
Owner INSPUR BEIJING ELECTRONICS INFORMATION IND