ora-15031 DBCA找不到ASM磁盘组

使用DBCA创建数据库，使用ASM存储。ASM实例已经创建，但是在创建磁盘组窗口，无法找到已经创建的ASM磁盘组。ORACLEASM显示正常。
[yangwenchao@yangwenchao ~]$ /etc/init.d/oracleasm status
Checking if ASM is loaded: [ OK ]
Checking if /dev/oracleasm is mounted: [ OK ]
[yangwenchao@yangwenchao ~]$ /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
VOL4
VOL5
[yangwenchao@yangwenchao ~]$ /etc/init.d/oracleasm scandisks
Scanning system for ASM disks:

请问怎样才能添加上ASM磁盘组？

#/etc/init.d/oracleasm createdisk VOL1 /dev/sdb
#/etc/init.d/oracleasm createdisk VOL2 /dev/sdc
#/etc/init.d/oracleasm createdisk VOL3 /dev/sdd
#/etc/init.d/oracleasm createdisk VOL4 /dev/sde
#/etc/init.d/oracleasm createdisk VOL5 /dev/sdf

解决方法一

[root@racdb1 ~]# /etc/init.d/oracleasm scandisks
Scanning system for ASM disks: [ OK ]
[root@racdb1 disks]# /etc/init.d/oracleasm status
Checking if ASM is loaded: [ OK ]
Checking if /dev/oracleasm is mounted: [ OK ]
注意mount在 /dev/oracleasm

创建的时候路径要用全部路径（{jd1}路径）同时要要看
*.asm_diskgroups='ORACLE','dgtest' -----这个地方要经常更改
*.asm_diskstring='/dev/oracleasm/disks/VOL*' -----特别要注意这个地方
*.background_dump_dest='/u01/app/oracle/admin/+ASM/bdump'
*.core_dump_dest='/u01/app/oracle/admin/+ASM/cdump'
*.instance_type='asm'
*.large_pool_size=12M
*.remote_login_passwordfile='SHARED'
*.user_dump_dest='/u01/app/oracle/admin/+ASM/udump'

SQL> create diskgroup dgtest1 normal redundancy
2 failgroup dgtest_0001 disk '/dev/oracleasm/disks/VOL4' name dgtest_0003
3 failgroup dgtest_0002 disk '/dev/oracleasm/disks/VOL5' name dgtest_0004;

Diskgroup created.