/dev/sdb1 is apparently in use by the system; will not make a filesystem here!

格式化分区的时候出现以下错误（硬盘做过raid，现在单独分开用）

[root@livedvd tmp]# 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!

 

解决办法：
[root@livedvd tmp]# dmsetup status
pdc_ddgbaiaidi: 0 976562496 linear
live-osimg-min: 0 11468800 snapshot 3432/3432 24
live-rw: 0 11468800 snapshot 32984/1048576 144

[root@livedvd tmp]# dmsetup remove_all

[root@livedvd tmp]# dmsetup status
live-rw: 0 11468800 snapshot 32984/1048576 144

[root@livedvd tmp]# mkfs.ext4 /dev/sdb1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
30531584 inodes, 122096000 blocks
6104800 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
3727 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
 4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
 102400000

Writing inode tables: done                           
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 32 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.