系统环境：
操作系统： AIX5300-08
Oracle 软件： Oracle 10gR2
错误现象：
通过AIX系统下的LV建立，ASM磁盘出现故障
查看ASM磁盘信息
[oracle@aix211 ~]$kfod
--------------------------------------------------------------------------------
ORACLE_SID ORACLE_HOME
================================================================================
+ASM /u01/app/oracle/product/10.2.0/db_1
[oracle@aix211 ~]$kfod status=TRUE asm_diskstring='/dev/rlv*' disk=all
--------------------------------------------------------------------------------
Disk Size Header Path
================================================================================
1: 4096 Mb FOREIGN /dev/rlv_asm1 //这个裸设备信息和其他lv不一致
2: 4096 Mb CANDIDATE /dev/rlv_asm2
3: 4096 Mb CANDIDATE /dev/rlv_asm3
4: 4096 Mb CANDIDATE /dev/rlv_asm4
--------------------------------------------------------------------------------
ORACLE_SID ORACLE_HOME
================================================================================
+ASM /u01/app/oracle/product/10.2.0/db_1
6、建立ASM磁盘组
[oracle@aix211 ~]$export ORACLE_SID=+ASM
[oracle@aix211 ~]$sqlplus '/as sysdba'
SQL*Plus: Release 10.2.0.1.0 - Production on Tue May 27 16:36:03 2014
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
SQL> create diskgroup dg1
2 normal redundancy
3 failgroup fg1 disk '/dev/rlv_asm1'
4 failgroup fg2 disk '/dev/rlv_asm2';
create diskgroup dg1
*
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15201: disk /dev/rlv_asm1 contains a valid RDBMS file
报错信息：rlv_asm1被数据库实例占用
解决方法：
清除ASM磁盘头部信息：
[oracle@aix211 ~]$dd if=/dev/zero of=/dev/rlv_asm1 bs=8192 count=2560
2560+0 records in
2560+0 records out
[oracle@aix211 ~]$kfod status=TRUE asm_diskstring='/dev/rlv*' disk=all
--------------------------------------------------------------------------------
Disk Size Header Path
================================================================================
1: 4096 Mb CANDIDATE /dev/rlv_asm1 //此时，rlv_asm1和其他lv保持一致
2: 4096 Mb CANDIDATE /dev/rlv_asm2
3: 4096 Mb CANDIDATE /dev/rlv_asm3
4: 4096 Mb CANDIDATE /dev/rlv_asm4
--------------------------------------------------------------------------------
ORACLE_SID ORACLE_HOME
================================================================================
+ASM /u01/app/oracle/product/10.2.0/db_1
再建立磁盘组：
[oracle@aix211 ~]$sqlplus '/as sysdba'
SQL*Plus: Release 10.2.0.1.0 - Production on Tue May 27 16:44:16 2014
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
SQL> create diskgroup dg1
2 normal redundancy
3 failgroup fg1 disk '/dev/rlv_asm1'
4 failgroup fg2 disk '/dev/rlv_asm2';
Diskgroup created.
SQL> create diskgroup rcy1
2 normal redundancy
3 failgroup fg1 disk '/dev/rlv_asm3'
4 failgroup fg2 disk '/dev/rlv_asm4';
Diskgroup created.
查看磁盘组信息
SQL> select name,state from v$asm_diskgroup;
NAME STATE
------------------------------ -----------
DG1 MOUNTED
RCY1 MOUNTED
@至此，问题解决，应该是在LV的字符设备的头部出现了ASM无法处理的信息，清除头部信息后，问题解决。
