在Oracle 11g中，增加磁盘到已有的磁盘组中，操作命令还是"alter diskgroup webdg add disk '/dev/raw/raw4';"，但是使用sysdba连接则会报错。
ORA-15260: permission denied on ASM disk group
告知权限被否则。
[root@serv1 ~]# su - grid
/home/grid@serv1=>+ASM1$sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Thu May 3 15:28:20 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options
SQL> alter diskgroup webdg add disk '/dev/raw/raw4';
alter diskgroup webdg add disk '/dev/raw/raw4'
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15260: permission denied on ASM disk group
使用sysasm连接，即可。
/home/grid@serv1=>+ASM1$sqlplus / as sysasm
SQL*Plus: Release 11.2.0.1.0 Production on Thu May 3 15:29:42 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options
SQL> show user
USER is "SYS"
SQL> alter diskgroup webdg add disk '/dev/raw/raw4';
这是11g在ASM管理上一个改进。
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