It is strongly not recommended to start multiple restore tasks at the same time to restore the data of a single cluster for the following reasons:
- When BR restores data, it modifies some global configurations of PD. Therefore, if you start multiple restore tasks for data restore at the same time, these configurations might be mistakenly overwritten and cause abnormal cluster status.
- BR consumes a lot of cluster resources to restore data, so in fact, running restore tasks in parallel improves the restore speed only to a limited extent.
- There has been no test for running multiple restore tasks in parallel for data restore, so it is not guaranteed to succeed.