mount: /dev/sdd1 already mounted or /mnt busy

# mount /dev/sdd1 /mnt
mount: /dev/sdd1 already mounted or /mnt busy

# mkfs.ext4 /dev/sdd1
/dev/sdd1 is apparently in use by the system; will not make a filesystem here!

以上两个提示的解决方法

# dmsetup status
35000c50070b2d48f-part1: 0 1172118402 linear
35000c50070b2d48f: 0 1172123568 multipath 2 0 0 0 1 1 A 0 1 0 8:48 A 0
# dmsetup remove_all

#dmsetup status
No devices found

mkfs.ext4 and mount again,success