在grid用户下进行操作

第一步：创建磁盘组

 [root@dmsdb1 mapper]# /usr/sbin/oracleasm createdisk  DATA4 /dev/mapper/mpath4

Writing disk header: done

Instantiating disk: done

[root@dmsdb1 mapper]# /usr/sbin/oracleasm createdisk  DATA5 /dev/mapper/mpath5

Writing disk header: done

Instantiating disk: done

…..

第二步：在第一个节点list磁盘组

[root@dmsdb1 mapper]#  /usr/sbin/oracleasm listdisks

DATA1

DATA2

DATA3

DATA4

DATA5

DATA6

第三步：在节点二扫描磁盘

[root@dmsdb2 ~]# /usr/sbin/oracleasm scandisks

Reloading disk partitions: done

Cleaning any stale ASM disks...

Scanning system for ASM disks...

Instantiating disk "DATA3"

Instantiating disk "DATA6"

Instantiating disk "DATA4"

Instantiating disk "DATA5"

[root@dmsdb2 mapper]#  /usr/sbin/oracleasm listdisks

DATA1

DATA2

DATA3

DATA4

DATA5

DATA6

第四步：添加磁盘组

[grid@dmsdb1 ~]$ sqlplus / as sysasm

SQL*Plus: Release 11.2.0.2.0 Production on Tue Jul 3 08:58:52 2012

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production

With the Real Application Clusters and Automatic Storage Management options

SQL> alter diskgroup DATA add disk 'ORCL:DATA3';

Diskgroup altered.

SQL> alter diskgroup DATA add disk 'ORCL:DATA4';

Diskgroup altered.

SQL> alter diskgroup DATA add disk 'ORCL:DATA5';

Diskgroup altered.

SQL> alter diskgroup DATA add disk 'ORCL:DATA6';

Diskgroup altered.

SQL>

第五步：查看磁盘使用情况

SQL> select group_number,TOTAL_MB,FREE_MB from v$asm_disk;

GROUP_NUMBER   TOTAL_MB    FREE_MB

------------ ---------- ----------

           1      62055      47531

           1      62055      47566

           1      62057      47570

           1      62057      47569

           1      62057      47568

           1      62057      47576

3         rows selected

注：发现每块磁盘都得到使用，它的性能比1块磁盘的性能好多了。说明磁盘挂载成功了。