ColumnStore 6.1.1 supports the port_number option in the [S3] group in storagemanager.cnf. This option is useful for S3-compatible storage options that use a custom port, such as MinIO.
However, the option is not shown in the bundled storagemanager.cnf, where most of the options are described in great detail, so users will only be able to find out about the option by reading the documentation or by looking at the source code.
The [S3] group in the bundled storagemanager.cnf can be viewed here: https://github.com/mariadb-corporation/mariadb-columnstore-engine/blob/columnstore-6.1.1-1/storage-manager/storagemanager.cnf.in#L89
The code that reads the option is here: https://github.com/mariadb-corporation/mariadb-columnstore-engine/blob/columnstore-6.1.1-1/storage-manager/src/S3Storage.cpp#L130