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症状：

当NFS SERVER服务停止或者是NFS SERVER宕机，NFS Client 中一些涉及到挂载目录的命令可能会被挂起，如df、ls等。

解决办法：

可以使用mount -l列出挂载的目录，卸载掉已经停止NFS服务的目录

[root@test01 ~]# mount -l
/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda1 on /boot type ext3 (rw) [/boot]
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
192.168.146.250:/home/share on /mnt type nfs (rw,addr=192.168.146.250)

[root@test01 ~]# umount -l /mnt/ #卸载
[root@test01 ~]# mount -l      
/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda1 on /boot type ext3 (rw) [/boot]
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)