RedHat 7.3 修改ASM磁盘绑定路径

　　RedHat 7中，很多命令发生了改变，绑定磁盘不再是start_udev，而是udevadm，具体绑定方式，请看另一篇博文：

　　http://www.cnblogs.com/zx3212/p/6757394.html

1、首先在系统层面查看磁盘绑定情况，如下，

[root@raca1 ~]# ls -l /dev/asm*
lrwxrwxrwx 1 root root 4 Apr 24 15:34 /dev/asm-datadisk1 -> sdf2
lrwxrwxrwx 1 root root 4 Apr 24 15:39 /dev/asm-datadisk2 -> sdg2
lrwxrwxrwx 1 root root 4 Apr 24 15:39 /dev/asm-ocrdisk1 -> sdb2
lrwxrwxrwx 1 root root 4 Apr 24 15:17 /dev/asm-ocrdisk2 -> sdc2
lrwxrwxrwx 1 root root 4 Apr 24 15:17 /dev/asm-ocrdisk3 -> sdd2
lrwxrwxrwx 1 root root 4 Apr 24 15:40 /dev/asm-ocrdisk4 -> sde2

2、群集创建完毕，发现在创建ASM磁盘时路径选择错误，应该选择/dev/asm*，结果错选成了/dev/sd*：

SQL> select name,path from v$asm_disk;   
 
NAME            PATH
----------------------------------------
/dev/sdf2
/dev/sdg2        MGMT_0000
/dev/sde2        VOTE_0002
/dev/sdd2        VOTE_0000
/dev/sdb2        VOTE_0001
/dev/sdc2
 
6 rows selected.
 
SQL> show parameter string
 
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
asm_diskstring                       string      /dev/sd*

3、修改参数asm_diskstring：

SQL> alter system set asm_diskstring='/dev/asm*' scope=spfile;
 
System altered.

4、生成一个pfile，防止后续数据库无法启动，可用此pfile文件启动数据库

SQL> create pfile='/tmp/pfileraca.ora' from spfile;
 
File created.
 
SQL> quit
Disconnected from Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
[grid@raca2 ~]$ exit
logout

5、用root用户进入到GI的HOME/bin目录下，重新启动集群

[root@raca2 ~]# cd /u01/grid/app/12.2.0/bin/
[root@raca2 bin]# ./crsctl stop cluster
[root@raca2 bin]# ./crsctl start cluster

6、进入ASM实例查看路径情况，已修改完成

[grid@raca2 ~]$ sqlplus / as sysasm
SQL> show parameter string
 
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
asm_diskstring                       string      /dev/asm*
SQL> select name,path from v$asm_disk;
 
NAME                      PATH
------------------------- ------------------------------
                               /dev/asm-datadisk2
                               /dev/asm-datadisk1
VOTE_0002             /dev/asm-ocrdisk3
MGMT_0000           /dev/asm-ocrdisk4
VOTE_0001             /dev/asm-ocrdisk2
VOTE_0000             /dev/asm-ocrdisk1
 
6 rows selected.