The s3-sharding template uses the same parameters as Amazon S3 official template except for UrlPresigning, which is not supported.
<chain> <!-- template="s3-sharding" -->
<provider id="cache-fs" type="cache-fs">
<provider type="sharding" id="sharding">
<redundancy>2</redundancy>
<sub-provider type="state-aware-s3" id="s3-shard1"/>
<sub-provider type="state-aware-s3" id="s3-shard2"/>
</provider>
</provider>
</chain>