[root@redhat1 grid]# su - grid
[grid@redhat1 ~]$ su /nolog
su: 用户/nolog 不存在
[grid@redhat1 ~]$ sqlplus /nologSQL*Plus: Release 12.1.0.1.0 Production on Thu Nov 12 20:16:13 2015Copyright (c) 1982, 2013, Oracle.  All rights reserved.SQL> conn system as sysdba;
Enter password:
Connected.
SQL> create diskgroup hu^H2
SQL> create diskgroup HUGED external redumdancy disk HUGE 2  ;
create diskgroup HUGED external redumdancy disk HUGE*
ERROR at line 1:
ORA-00905: missing keywordSQL> create diskgroup HUGED external redumdancy disk “HUGE";
create diskgroup HUGED external redumdancy disk “HUGE"*
ERROR at line 1:
ORA-00905: missing keywordSQL> create diskgroup HUGED external redumdancy disk 'HUGE';
create diskgroup HUGED external redumdancy disk 'HUGE'*
ERROR at line 1:
ORA-00905: missing keywordSQL> create diskgroup HUGED external redumdancy disk 'ORCL:HUGE';
create diskgroup HUGED external redumdancy disk 'ORCL:HUGE'*
ERROR at line 1:
ORA-00905: missing keywordSQL> create diskgroup HUGED external redumdancy disk 'ORCL:HUGE' name hugedisk;
create diskgroup HUGED external redumdancy disk 'ORCL:HUGE' name hugedisk*
ERROR at line 1:
ORA-00905: missing keywordSQL> create diskgroup HUGED external redumdancy disk 'HUGE' name hugedisk;
create diskgroup HUGED external redumdancy disk 'HUGE' name hugedisk*
ERROR at line 1:
ORA-00905: missing keywordSQL> create diskgroup HUGED external redumdancy disk 'ORCL:HUGE';
create diskgroup HUGED external redumdancy disk 'ORCL:HUGE'*
ERROR at line 1:
ORA-00905: missing keywordSQL> exit
Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options
[grid@redhat1 ~]$ su root
密码：
[root@redhat1 grid]# su oracle
[oracle@redhat1 grid]$ su root
密码：
[root@redhat1 grid]# su - oracle
[oracle@redhat1 ~]$ sqlplus /nologSQL*Plus: Release 12.1.0.1.0 Production on Thu Nov 12 20:44:49 2015Copyright (c) 1982, 2013, Oracle.  All rights reserved.SQL> conn system as sysdba
Enter password:
Connected.
SQL> ORA-00905: missing keyword
SP2-0734: unknown command beginning "ORA-00905:..." - rest of line ignored.
SQL> create diskgroup HUGED external redumdancy disk 'ORCL:HUGE';
create diskgroup HUGED external redumdancy disk 'ORCL:HUGE'*
ERROR at line 1:
ORA-00905: missing keywordSQL> select * from v$sga;NAME              VALUE     CON_ID
-------------------- ---------- ----------
Fixed Size      2289544      0
Variable Size         536871032      0
Database Buffers     1291845632      0
Redo Buffers        6238208      0SQL> create table syl (UUU varchar2(20),PPP  varchar2(100),XMXM VARCHAR2(10),DPPT VARCHAR2(50));Table created.SQL> create diskgroup HUGEDISK external redumdancy disk 'ORCL:HUGE';
create diskgroup HUGEDISK external redumdancy disk 'ORCL:HUGE'*
ERROR at line 1:
ORA-00905: missing keywordSQL> create diskgroup HUGEDISK external redumdancy disk 'ORCL:HUGE';
create diskgroup HUGEDISK external redumdancy disk 'ORCL:HUGE'*
ERROR at line 1:
ORA-00905: missing keywordSQL> exit
Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Advanced Analytics and Real Application Testing options
[oracle@redhat1 ~]$ su - grid
密码：
[grid@redhat1 ~]$ sqlplus /nologSQL*Plus: Release 12.1.0.1.0 Production on Thu Nov 12 20:59:26 2015Copyright (c) 1982, 2013, Oracle.  All rights reserved.SQL> exit
[grid@redhat1 ~]$ sqlplus / as sysasmSQL*Plus: Release 12.1.0.1.0 Production on Thu Nov 12 20:59:53 2015Copyright (c) 1982, 2013, Oracle.  All rights reserved.Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management optionsSQL> create diskgroup HUGEDISK external redumdancy disk 'ORCL:HUGE';
create diskgroup HUGEDISK external redumdancy disk 'ORCL:HUGE'*
ERROR at line 1:
ORA-00905: missing keywordSQL> create diskgroup HUGEDISK external redumdancy disk 'HUGE';
create diskgroup HUGEDISK external redumdancy disk 'HUGE'*
ERROR at line 1:
ORA-00905: missing keywordSQL> create diskgroup HUGEDISK external redumdancy disk 'HUGE' attribute 'compatible.asm' = '12.1.0.0.0';
create diskgroup HUGEDISK external redumdancy disk 'HUGE' attribute 'compatible.asm' = '12.1.0.0.0'*
ERROR at line 1:
ORA-00905: missing keywordSQL> create diskgroup HUGEDISK external redumdancy disk '/dev/sdd1';
create diskgroup HUGEDISK external redumdancy disk '/dev/sdd1'*
ERROR at line 1:
ORA-00905: missing keywordSQL> CREATE DISKGROUP dg_01  EXTERNAL REDUNDANCY  DISK '/dev/sdd1 ';
CREATE DISKGROUP dg_01  EXTERNAL REDUNDANCY  DISK '/dev/sdd1 '
*
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification '/dev/sdd1 ' matches no disksSQL> CREATE DISKGROUP HUGE  EXTERNAL REDUNDANCY  DISK 'HUGE';
CREATE DISKGROUP HUGE  EXTERNAL REDUNDANCY  DISK 'HUGE'
*
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification 'HUGE' matches no disksSQL> CREATE DISKGROUP HUGE  EXTERNAL REDUNDANCY  DISK 'HUGE';
CREATE DISKGROUP HUGE  EXTERNAL REDUNDANCY  DISK 'HUGE'
*
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification 'HUGE' matches no disksSQL> CREATE DISKGROUP HUGE  EXTERNAL REDUNDANCY  DISK '/dev/sdd1';
CREATE DISKGROUP HUGE  EXTERNAL REDUNDANCY  DISK '/dev/sdd1'
*
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification '/dev/sdd1' matches no disks
ORA-15025: could not open disk "/dev/sdd1"
ORA-27041: unable to open file
Linux-x86_64 Error: 13: Permission denied
Additional information: 42
Additional information: 140734139669792
Additional information: 140487399526291SQL> CREATE DISKGROUP HUGE  EXTERNAL REDUNDANCY  DISK '/dev/oracleasm/disks/HUGE';
CREATE DISKGROUP HUGE  EXTERNAL REDUNDANCY  DISK '/dev/oracleasm/disks/HUGE'
*
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification '/dev/oracleasm/disks/HUGE' matches no disks
ORA-15014: path '/dev/oracleasm/disks/HUGE' is not in the discovery setSQL> select path from v$asm_disk;PATH
--------------------------------------------------------------------------------
ORCL:HUGE
ORCL:MM1
ORCL:MM2
ORCL:MM3SQL> CREATE DISKGROUP HUGE  EXTERNAL REDUNDANCY  DISK 'ORCL:HUGE';Diskgroup created.SQL>

上述一大段都是创建磁盘组命令，看似简单，实际自己使用的时候，花费了半个小时，原因是部分关键字要大写；上述这些命令中，
create diskgroup HUGEDISK external redumdancy disk ‘ORCL:HUGE’;
一直提示ORA-00905: missing keyword
不管后须的磁盘是否正确；

使用这个命令CREATE DISKGROUP dg_01 EXTERNAL REDUNDANCY DISK ‘/dev/sdd1’;就报其他错误了
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification ‘/dev/sdd1’ matches no disks
ORA-15025: could not open disk “/dev/sdd1”
ORA-27041: unable to open file

说明DISKGROUP、EXTERNAL REDUNDANCY DISK这几个字中某个必须大写；这里因为时间关系，暂时没研究，必须哪个大写；

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