rel5下安装orale11gr2时无法创建ASM磁盘

错误如下:
[root@std01 ~]# /etc/init.d/oracleasm createdisk disk1 /dev/sdb1
Marking disk "disk1" as an ASM disk: [FAILED]

[root@std01 ~]# /etc/init.d/oracleasm createdisk disk1 /dev/sdc1
Marking disk "disk1" as an ASM disk: [FAILED]

fdisk -l 如下:

Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

  Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 5221 41833260 8e Linux LVM

Disk /dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

  Device Boot Start End Blocks Id System
/dev/sdb1 1 1305 10482381 83 Linux

Disk /dev/sdc: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

  Device Boot Start End Blocks Id System
/dev/sdc1 1 1305 10482381 83 Linux
[root@std01 ~]# 

错误日志如下:
Creating /dev/oracleasm mount point: /dev/oracleasm
Loading module "oracleasm": oracleasm
Mounting ASMlib driver filesystem: /dev/oracleasm
Reloading disk partitions: done
Cleaning any stale ASM disks...
Scanning system for ASM disks...
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
Reloading disk partitions: done
Cleaning any stale ASM disks...
Scanning system for ASM disks...
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
Unable to open device "/dev/sda1": Device or resource busy
Unable to query file "/dev/sd1": No such file or directory
Unable to query file "/dev/sd1": No such file or directory
Unable to query file "/dev/sd3": No such file or directory
Unable to open device "/dev/sda1": Device or resource busy
Creating /dev/oracleasm mount point: /dev/oracleasm
Loading module "oracleasm": oracleasm
Mounting ASMlib driver filesystem: /dev/oracleasm
Reloading disk partitions: done
Cleaning any stale ASM disks...
Scanning system for ASM disks...
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
Creating /dev/oracleasm mount point: /dev/oracleasm
Loading module "oracleasm": oracleasm
Mounting ASMlib driver filesystem: /dev/oracleasm
Reloading disk partitions: done
Cleaning any stale ASM disks...
Scanning system for ASM disks...
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
Unable to open device "/dev/sdb": Device or resource busy
Unable to open device "/dev/sdb1": Device or resource busy
Unable to open device "/dev/sdb": Device or resource busy
Unable to open device "/dev/sdb": Device or resource busy
Unable to open device "/dev/sdb1": Device or resource busy
Reloading disk partitions: done
Cleaning any stale ASM disks...
Scanning system for ASM disks...
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
Unable to open device "/dev/sdb1": Device or resource busy
Unable to open device "/dev/sdb1": Device or resource busy
Creating /dev/oracleasm mount point: /dev/oracleasm
Loading module "oracleasm": oracleasm
Mounting ASMlib driver filesystem: /dev/oracleasm
Reloading disk partitions: done
Cleaning any stale ASM disks...
Scanning system for ASM disks...
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
Reloading disk partitions: done
Cleaning any stale ASM disks...
Scanning system for ASM disks...
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-0": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
oracleasm-read-label: Unable to open device "/dev/dm-1": No such file or directory
Unable to open device "/dev/sdb1": Device or resource busy

请问各位大神,这是什么原因?怎么解决?

解决了,方法是:umount /dev/sdb1 /u01