mount: /dev/sdd1 already mounted or /data3 busy
解决过程记录：
[root@localhost ~]# dmsetup status ResultFromHadoop-ResultFromHadoop: 0 3907026944 linear ResultFromHadoop-ResultFromHadoop: 3907026944 3907026944 linear ResultFromHadoop-ResultFromHadoop: 7814053888 3907026944 linear [root@localhost ~]# dmsetup remove_all [root@localhost ~]# dmsetup status No devices found
再次执行mount /dev/sdd1 /data3就可以进行挂载了。