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+## System-docker and RootFS
+
+When you ssh into RancherOS, you actually access the console container. The default console will automatically clean up the data, except for the following directories:
+
+```
+# These are the main ones
+/opt
+/home/
+/var/lib/docker
+/mnt
+/var/log
+...
+...
+```
+
+If you put the data in these directories, you actually write directly to the root disk.
+
+The system-docker data is written to the root disk, so it is not recommended for users to run their containers under system-docker.
+
+If the user can use it friendly, two places still need attention:
+
+1. the only thing that needs attention is the `/var/log` directory. It is necessary to clean it regularly.
+
+2. the container logs in system-docker, they are in json-file format. This part of the change should be slow.
+
+
+## User-docker
+
+The user-docker data is written to the root disk by default. This part is necessary to use additional disk. Can refer to the following settings:
+
+```
+#cloud-config
+mounts:
+- - /dev/sdb
+  - /var/lib/docker/mnt
+  - ext4
+  - ""
+rancher:
+  docker:
+    graph: /var/lib/docker/mnt
+
+
+# check user docker
+$ docker info
+Name: rancher
+ID: BU6T:6LTB:VKUU:GZM2:OGCR:IIVZ:6MVK:II73:KVVE:EEGI:CGPT:FWYS
+***Docker Root Dir: /var/lib/docker/mnt****
+Debug Mode (client): false
+Debug Mode (server): false
+Registry: https://index.docker.io/v1/
+...
+
+# check mountinfo
+$ df -hT
+....
+/dev/sdb             ext4            9.8G     36.2M      9.2G   0% /var/lib/docker/mnt
+....
+```
+
+## Others
+
+If you are not using the default console, then most of the data you write will be saved in the root disk.
+
+In the system, it is necessary to run a monitor to detect disk usage at all times.
+
+
+## Reference
+
+[Additional Mounts](https://rancher.com/docs/os/v1.x/en/installation/storage/additional-mounts/)