ClickHouse/tests/integration/test_storage_policies/configs/disk2_only.xml

<clickhouse>
    <storage_configuration>
        <disks>
            <disk2>
                <path>/var/lib/clickhouse2/</path>
            </disk2>
        </disks>
        <policies>
            <test_policy>
                <volumes>
                    <volume2>
                        <disk>disk2</disk>
                    </volume2>
                </volumes>
            </test_policy>
        </policies>
    </storage_configuration>
</clickhouse>