//没有挂载磁盘的目录，显示在系统盘[root@iZ2ze57v3n0zma46zqiq8nZ sh-1.5.5]# df -h /alidata/Filesystem Size Used Avail Use% Mounted on/dev/vda1 40G 4.6G 33G 13% ///挂载了磁盘的目录，显示在数据盘分区vdb1[root@iZ2ze57v3n0zma46zqiq8nZ sh-1.5.5]# df -h /mnt/Filesystem Size Used Avail Use% Mounted on/dev/vdb1 20G 45M 19G 1% /mnt