Method and apparatus for fast generating a full snapshot, electronic device and storage medium

An apparatus for fast generating a full snapshot, comprising:

• a creation module configured to create a source data volume and allocate a first-level data pointer table, wherein the first-level data printer table records location information of a plurality of second-level data pointer tables, and the plurality of second-level data pointer tables record location information of a data block;
• a determination module configured to, when data is written into the source data volume, determine, according to a written data offset, whether a target second-level data pointer table in which the written data is located exists in the plurality of second-level data pointer tables and whether the target second-level data pointer table is valid;
• a write module configured to, in response to determining that the target second-level data pointer table exists and is valid, write the data into the source data volume and record a write location of the data in the target second-level data pointer table;
• and
• a snapshot module configured to, when a snapshot is created, copy the first-level data pointer table as a first-level data pointer table for the snapshot.

An electronic device, comprising:

• at least one processor;
• and
• a memory communicatively connected to the at least one processor,
• wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to cause the at least one processor to perform the following:
• creating a source data volume and allocating a first-level data pointer table, wherein the first-level data printer table records location information of a plurality of second-level data pointer tables, and the plurality of second-level data pointer tables record location information of a data block;
• when data is written into the source data volume, determining, according to a written data offset, whether a target second-level data pointer table in which the written data is located exists in the plurality of second-level data pointer tables and whether the target second-level data pointer table is valid;
• in response to determining that the target second-level data pointer table exists and is valid, writing the data into the source data volume and recording a write location of the data in the target two-level data pointer table;
• and
• when a snapshot is created, copying the first-level data pointer table as a first-level data pointer table for the snapshot.