You can implement sharding with multiple S3 buckets. The s3-sharding template is available with Artifactory to configure sharding with S3. A sub-binary provider, state-aware-s3, template is used with the s3-sharding template to implelement sharding across multiple S3 buckets.
Warning
Sharding rules such as redundancy and write/read mechanisms are applicable on the new data added to the filestore post the changes to the filestore configuration. For existing data in the filestore, you must copy the data to other new S3 shards.