The system disk is like the c disk of linux, use the df -l command to view
As follows:
You can see that the root path / is located in the system disk. And /root, /home, /usr are just like c:\windows and c:\usr under the c drive
If there is a separate data disk, and the data disk is not partitioned and mounted, it will not be visible using the df -l command
You can use fdisk -l to see which hard disks are available
The following information:
Disk /dev/vda and Disk /dev/vdb indicate that there are two blocks
/dev/vda-system disk, there is a partition vda1
/dev/vdb-data disk, there are two partitions vdb1, vdb2