When mounting the hard disk partition, mount: /dev/sdd1 already mounted or /data3 busy or when formatting the partition will also appear
/dev/hdb1 is apparently in use by the system; will not make a filesystem here!
Solution:
[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
Execute mount /dev/sdd1 /data3 again to mount it