Final answer:
To replicate pre-existing buckets when migrating to a multi-site cluster, one must configure replication between the old and new clusters, initialize the synchronization process, and ensure all steps align with the specific system's documentation.
Step-by-step explanation:
When migrating from a single-site cluster to a multi-site cluster, replicating pre-existing buckets to the new site typically involves several steps. The process usually includes the addition of the new cluster to the existing replication configuration, the initialization of replication, and ensuring that the data is synchronized across sites. In most distributed data storage systems, replication is often a built-in feature that can be configured according to the specifics of the system in use.
It is crucial to follow the documentation provided by the distributed data storage solution you are using, as procedures may vary. This includes setting up the correct replication policies, ensuring network configurations are optimal for data transfer, and keeping in mind the security and permissions settings during the replication process. Accurate data replication is essential for maintaining consistency and ensuring no data loss occurs during the transition.