linux 连接 NAS

[root@kvm-server ~]# mount -o username=user01,password=1234567890 //192.168.31.20/share /mnt/nas
Couldn't chdir to /mnt/nas: No such file or directory
[root@kvm-server ~]# 
[root@kvm-server ~]# mkdir /mnt/nas
[root@kvm-server ~]# mount -o username=user01,password=1234567890 //192.168.31.20/share /mnt/nas
[root@kvm-server ~]# df -TH
文件系统                类型      容量  已用  可用 已用% 挂载点
/dev/mapper/centos-root xfs        48G  4.1G   44G    9% /
devtmpfs                devtmpfs  4.1G     0  4.1G    0% /dev
tmpfs                   tmpfs     4.2G     0  4.2G    0% /dev/shm
tmpfs                   tmpfs     4.2G  9.4M  4.1G    1% /run
tmpfs                   tmpfs     4.2G     0  4.2G    0% /sys/fs/cgroup
/dev/sda1               xfs       1.1G  189M  876M   18% /boot
tmpfs                   tmpfs     821M   13k  821M    1% /run/user/42
tmpfs                   tmpfs     821M   33k  821M    1% /run/user/0
/dev/sr0                iso9660   4.6G  4.6G     0  100% /run/media/root/CentOS 7 x86_64
//192.168.31.20/share   cifs      7.8T  4.0T  3.9T   51% /mnt/nas
[root@kvm-server ~]# cd /mnt/nas/
[root@kvm-server nas]# ll
总用量 1329600
drwxr-xr-x 2 root root          0 1月  19 11:43 501
drwxr-xr-x 2 root root          0 10月  6 2017 aix
drwxr-xr-x 2 root root          0 1月  19 13:16 doc
drwxr-xr-x 2 root root          0 9月  20 23:12 HP-UX
drwxr-xr-x 2 root root          0 1月  19 11:52 ISO