故障描述
[root@client1 home]# ls /
ls: cannot access /com: Host is down
故障原因
你的当前目录下有一个文件夹是网络文件夹，这个文件夹指向的是网络上的一台远端主机上的文件夹。
而你现在用ls时，远端的主机已经关机，就会出现这种情况。
解决办法
umount /com
注释/etc/fstab关于/com的内容
ls: cannot access /com: Host is down
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