Centos下无法格式化硬盘/dev/sd* is apparently in use by the system; will not make a filesystem here!

环境说明

Centos 6.8

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.xfs /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