Scenarios
In the configuration of Data Transfer Service (DTS) data migration tasks or during task execution, you can dynamically adjust the write speed to the target database based on its resource configuration.
Note:
1. The speed limit configured in the DTS console is the write traffic limit for the target. Users can convert it to the export traffic limit for the source based on actual conditions.
For example, if the target has 3 shards and the speed limit for each shard is 100 MB/s, the total speed limit for the target is 300 MB/s. If the source has 6 shards, the speed limit for each shard on the source is 50 MB/s (300/6).
2. After the speed limit for the target is configured (such as a total speed limit of 300 MB/s), the actual write traffic to the target will be less than or equal to the configured total speed limit.
By default, DTS uses a concurrency of 4 when pulling RDB files from the source. Once an RDB file is pulled completely, parsing and writing to the target begin immediately. If the data volume of a single shard is relatively small, the pulling speed will exceed the parsing speed, and the write traffic to the target will reach the configured upper limit of 300 MB/s; if the pulling speed is slower than the parsing speed, the write traffic to the target will not reach the configured upper limit.
Must-Knows
The speed limiting feature of Redis was launched in March 2024. It only supports configuring speed limits for tasks initiated after the launch. Tasks created before the launch are not supported. To modify existing tasks, submit a ticket to upgrade the task. Operation Steps
The following example describes how to configure speed limits during task execution.
1. Log in to the DTS console, select Data Migration in the left sidebar, and select the specified migration task on the right. 2. In the Operation column, choose More > Limit Speed.
3. In the pop-up window, adjust the speed parameters and click OK.