环境说明：ubuntu 18.04 Lts
问题说明：新装的Linux系统，两块硬盘，一块作为系统磁盘，另一块作为数据磁盘，安装完系统后，由于该数据磁盘中包含之前残余的LVM信息，无法对数据磁盘无法进行操作。
新系统启动后，通过fdisk -l查看磁盘信息如下
[root@ovirt-host ~]# fdisk -l
Disk /dev/sda: 999.7 GB, 999653638144 bytes
255 heads, 63 sectors/track, 121534 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000d16e8
Device Boot Start End Blocks Id System
/dev/sda1 * 1 131 1048576 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 131 4211 32768000 82 Linux swap / Solaris
/dev/sda3 4211 121535 942406656 83 Linux
Disk /dev/sdb: 999.7 GB, 999653638144 bytes
255 heads, 63 sectors/track, 121534 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a65a6
Device Boot Start End Blocks Id System
/dev/sdb1 1 121534 976221823+ 83 Linux
Disk /dev/mapper/3600508e00000000017cd3aa6870c460a: 999.7 GB, 999653638144 bytes
255 heads, 63 sectors/track, 121534 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a65a6
Device Boot Start End Blocks Id System
/dev/mapper/3600508e00000000017cd3aa6870c460ap1 1 121534 976221823+ 83 Linux对sdb1进行格式化，无法进行格式化，提示如下
[root@ovirt-host ~]# mkfs.ext4 /dev/sdb1
mke2fs 1.41.12 (17-May-2010)
/dev/sdb1 is apparently in use by the system; will not make a filesystem here!解决方法：
通过dm解决问题，查看dm状态，显示dm设备信息
[root@ovirt-host ~]# dmsetup status
3600508e00000000017cd3aa6870c460a: 0 1952448512 multipath 2 0 0 0 1 1 A 0 1 0 8:16 A 0 删除dm信息，并再次查看dm状态信息
[root@ovirt-host ~]# dmsetup remove_all
[root@ovirt-host ~]# dmsetup status
No devices found此次dm已经找不到设备，再次通过fdisk查看磁盘信息，已经没有dm设备信息了
[root@ovirt-host ~]# fdisk -l;
Disk /dev/sda: 999.7 GB, 999653638144 bytes
255 heads, 63 sectors/track, 121534 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000d16e8
Device Boot Start End Blocks Id System
/dev/sda1 * 1 131 1048576 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 131 4211 32768000 82 Linux swap / Solaris
/dev/sda3 4211 121535 942406656 83 Linux
Disk /dev/sdb: 999.7 GB, 999653638144 bytes
255 heads, 63 sectors/track, 121534 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a65a6
Device Boot Start End Blocks Id System
/dev/sdb1 1 121534 976221823+ 83 Linux此时在对sdb1进行格式化操作
[root@ovirt-host ~]# mkfs.ext4 /dev/sdb1
meta-data=/dev/sdb1 isize=256 agcount=4, agsize=61013864 blks
= sectsz=512 attr=2, projid32bit=0
data = bsize=4096 blocks=244055455, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=4096 blocks=119167, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
