ClickHouse/dbms/tests/integration/test_multiple_disks/configs/config.d/storage_configuration.xml

<yandex>

<storage_configuration>
    <disks>
        <default> <!--path for default disk is provided in main config-->
            <keep_free_space_bytes>1000</keep_free_space_bytes>
        </default>
<!--        <mainstorage>-->
<!--            <path>/mainstorage/</path>&lt;!&ndash; trailing slash is mandatory &ndash;&gt;-->
<!--            <keep_free_space_bytes>1000000</keep_free_space_bytes>-->
<!--        </mainstorage>-->
        <jbod1>
            <path>/jbod1/</path>
            <keep_free_space_bytes>10000000</keep_free_space_bytes>
        </jbod1>
        <jbod2>
            <path>/jbod2/</path>
            <keep_free_space_bytes>10000000</keep_free_space_bytes>
        </jbod2>
        <external>
            <path>/external/</path>
        </external>
    </disks>

    <policies>
        <!-- default: store on mainstorage -->
<!--        <default>-->
<!--            <volumes>-->
<!--                <volume>-->
<!--                    <disk>mainstorage</disk>-->
<!--                    <max_data_part_size_bytes>20000000</max_data_part_size_bytes>-->
<!--                </volume>-->
<!--            </volumes>-->
<!--        </default>-->

        <!-- store local by default, store big parts on external -->
        <default_disk_with_external>
            <volumes>
                <small>
                    <!-- names for the volumes should be added to allow moving parts between volumed with DDL commands -->
                    <disk>default</disk>
                    <max_data_part_size_bytes>2000000</max_data_part_size_bytes>
                </small>
                <big>
                    <disk>external</disk>
                    <max_data_part_size_bytes>20000000</max_data_part_size_bytes>
                </big>
            </volumes>
        </default_disk_with_external>

        <!-- store on JBOD by default (round-robin), store big parts on external -->
        <jbod_with_external>
            <volumes>
                <main>
                    <disk>jbod1</disk>
                    <disk>jbod2</disk>
                    <max_data_part_size_bytes>10000000</max_data_part_size_bytes>
                    <!-- max_data_part_size_ratio>0.2</max_data_part_size_ratio -->
                </main>
                <external>
                    <disk>external</disk>
                    <!--max_data_part_size_bytes>30000000</max_data_part_size_bytes-->
                </external>
            </volumes>
        </jbod_with_external>

<!--        <mainstorage_only>-->
<!--            <volumes>-->
<!--                <main>-->
<!--                    <disk>mainstorage</disk>-->
<!--                    <max_data_part_size_bytes>9000000</max_data_part_size_bytes>-->
<!--                </main>-->
<!--                <extra>-->
<!--                    <disk>external</disk>-->
<!--                    <max_data_part_size_bytes>20000000</max_data_part_size_bytes>-->
<!--                </extra>-->
<!--            </volumes>-->
<!--        </mainstorage_only>-->


    </policies>

</storage_configuration>

</yandex>