1.需要对新增加的设备在每个节点进行授权使oracle用户能操作

[root@rac1 oracle]# chown oracle:dba /dev/raw/raw6
[root@rac1 oracle]# chmod 660 /dev/raw/raw6

[root@rac2 oracle]# chown oracle:dba /dev/raw/raw6
[root@rac2 oracle]# chmod 660 /dev/raw/raw6

2.oracle用户扫描磁盘路径能让asm认到设备

select path from v$asm_disk;

设置asm设备搜索路径

alter system set asm_diskstring='ORCL:VOL*','/dev/raw/raw*';

3.在rac1节点进行操作

[oracle@rac1 ~]$ export ORACLE_SID=+ASM1

[oracle@rac1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on Fri Jun 27 09:03:28 2008

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options

SQL> select group_number,name,state,total_mb from v$asm_diskgroup;

GROUP_NUMBER NAME STATE TOTAL_MB
------------ ------------------------------ ----------- ----------
2 DATA MOUNTED 3057

SQL> create diskgroup testdg external redundancy disk '/dev/raw/raw6';

Diskgroup created.

SQL> select group_number,name,state,total_mb from v$asm_diskgroup;

GROUP_NUMBER NAME                           STATE         TOTAL_MB
------------ ------------------------------ ----------- ----------
           1 TESTDG                         MOUNTED           2047
           2 DATA                           MOUNTED           3057

SQL> exit

4.在rac2节点进行操作

[oracle@rac2 dbs]$ export ORACLE_SID=+ASM2
[oracle@rac2 dbs]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on Fri Jun 27 09:08:26 2008

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options

SQL> select group_number,name,state,total_mb from v$asm_diskgroup;

GROUP_NUMBER NAME STATE TOTAL_MB
------------ ------------------------------ ----------- ----------
2 DATA MOUNTED 3057

SQL> alter diskgroup testdg mount;
alter diskgroup testdg mount
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15063: ASM discovered an insufficient number of disks for diskgroup
"TESTDG"

这是因为没在节点2进行授权所以报这个错按照1点进行授权后就正常了
SQL> select group_number,name,state,total_mb from v$asm_diskgroup;

GROUP_NUMBER NAME                           STATE         TOTAL_MB
------------ ------------------------------ ----------- ----------
           0 TESTDG                         DISMOUNTED           0
           2 DATA                           MOUNTED           3057

SQL> alter diskgroup testdg mount;

Diskgroup altered.

SQL> select group_number,name,state,total_mb from v$asm_diskgroup;

GROUP_NUMBER NAME                           STATE         TOTAL_MB
------------ ------------------------------ ----------- ----------
           1 TESTDG                         MOUNTED           2047
           2 DATA                           MOUNTED           3057

SQL>

如何在linux 10gR2 rac 新增ASM磁盘组