安装完RAC环境后，突然觉得之前配置的ASM磁盘不够用，于是打算再添加一块大容量的ASM磁盘；前面操作都无差异，这里补充后续操作。
查看asm disks:
[root@rac01 rules.d]# ls -l /dev/asm*
[root@rac01 rules.d]# ls -l /dev/asm*
brw-rw---- 1 grid asmadmin 8, 21 Nov 25 11:22 /dev/asm_disk1
brw-rw---- 1 grid asmadmin 8, 22 Nov 25 11:22 /dev/asm_disk2
brw-rw---- 1 grid asmadmin 8, 23 Nov 25 11:22 /dev/asm_disk3
brw-rw---- 1 grid asmadmin 8, 24 Nov 25 11:22 /dev/asm_disk4
brw-rw---- 1 grid asmadmin 8, 25 Nov 25 11:22 /dev/asm_disk5
brw-rw---- 1 grid asmadmin 8, 26 Nov 25 11:22 /dev/asm_disk6
brw-rw---- 1 grid asmadmin 8, 33 Nov 25 09:42 /dev/asm_disk7
在节点1中，使用grid用户运行asmca:
成功弹出ASM设置界面，选择Create
输入磁盘组名，选择External（外部冗余）（因为已经存在常规冗余磁盘组，为了省事儿这里选择外部冗余），选择磁盘： 
点击OK
点击OK回到初始界面，点击右下角Exit，然后选择Yes保留操作并退出
使用oracle 账户登录数据库并查询ASM磁盘组信息：
[root@rac01 ~]# su - oracle
[oracle@rac01 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.4.0 Production on Fri Nov 25 13:09:54 2016
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
SQL> select name,total_mb from v$asm_diskgroup;
NAME TOTAL_MB
------------------------------ ----------
DATA_DB 16378
DATA 6144
CY 102398
七、额外问题
完成上面的操作后，发现节点2出现了一些问题
[oracle@rac02 admin]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.4.0 Production on Fri Nov 25 13:13:45 2016
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to an idle instance.
SQL> select name,total_mb from v$asm_diskgroup;
select name,total_mb from v$asm_diskgroup
*
ERROR at line 1:
ORA-01034: ORACLE not available
Process ID: 0
Session ID: 0 Serial number: 0
实例似乎被关闭了，重启实例后，发现新加的ASM磁盘组挂载异常
SQL> startup
ORACLE instance started.
Total System Global Area 1603411968 bytes
Fixed Size 2253664 bytes
Variable Size 1056967840 bytes
Database Buffers 536870912 bytes
Redo Buffers 7319552 bytes
Database mounted.
Database opened.
SQL> select name,total_mb from v$asm_diskgroup;
NAME TOTAL_MB
------------------------------ ----------
DATA_DB 16378
DATA 6144
CY 0
[grid@rac02 admin]$ ocrcheck
Status of Oracle Cluster Registry is as follows :
Version : 3
Total space (kbytes) : 262120
Used space (kbytes) : 3072
Available space (kbytes) : 259048
ID : 277519239
Device/File Name : +DATA
Device/File integrity check succeeded
Device/File not configured
Device/File not configured
Device/File not configured
Device/File not configured
Cluster registry integrity check succeeded
Logical corruption check bypassed due to non-privileged user
手动挂载：
[grid@rac02 admin]$ sqlplus / as sysasm
SQL*Plus: Release 11.2.0.4.0 Production on Fri Nov 25 13:30:30 2016
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options
SQL> alter diskgroup CY mount;
Diskgroup altered.
SQL> select GROUP_NUMBER,NAME,TYPE,ALLOCATION_UNIT_SIZE,STATE from v$asm_diskgroup;
GROUP_NUMBER NAME TYPE ALLOCATION_UNIT_SIZE STATE
------------ ------------------------------ ------ --------------------
1 DATA_DB NORMAL 1048576 MOUNTED
2 DATA NORMAL 1048576 MOUNTED
3 CY EXTERN 1048576 MOUNTED
再次查询ASM磁盘组信息：
[oracle@rac02 admin]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.4.0 Production on Fri Nov 25 13:40:10 2016
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
SQL> select name,total_mb from v$asm_diskgroup;
NAME TOTAL_MB
------------------------------ ----------
DATA_DB 16378
DATA 6144
CY 102398
完成后发现CRS服务异常：
[grid@rac02 admin]$ crsctl check crs
CRS-4638: Oracle High Availability Services is online
CRS-4535: Cannot communicate with Cluster Ready Services
CRS-4529: Cluster Synchronization Services is online
CRS-4534: Cannot communicate with Event Manager