asm 添加磁盘组

为了重写默认的NORMAL冗余，也就是单镜像，向CREATE DISKGROUP命令添加关键字HIGH REDUNDANCY或EXTERNAL REDUNDANCY。HIGH REDUNDANCY将会为每个分配单元创建三个副本(因此至少需求三个磁盘)，EXTERNAL REDUNDANCY根本不会镜像：假定底层存在一个LVM并且它正在执行认为适当的任何一种RAID级别。


[oracle@node2 ~]$ export ORACLE_SID=+ASM2
[oracle@node2 ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.5.0 - Production on Wed Apr 10 08:30:39 2013

Copyright (c) 1982, 2010, Oracle. All Rights Reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options

SQL> select name,path from v$asm_disk;

NAME PATH
------------------------------ ------------------------------
/dev/raw/raw8
/dev/raw/raw10
/dev/raw/raw9
/dev/raw/raw2
/dev/raw/raw1
NEW_DG_0000 /dev/raw/raw7
DATA_0001 /dev/raw/raw4
DATA_0000 /dev/raw/raw3

SQL> select name from v$asm_diskgroup;

NAME
------------------------------
DATA
NEW_DG

SQL> create diskgroup awen external redundancy disk '/dev/raw/raw8','/dev/raw/raw9';

Diskgroup created.

SQL> select name,path from v$asm_disk;

NAME PATH
------------------------------ ------------------------------
/dev/raw/raw10
/dev/raw/raw2
/dev/raw/raw1
AWEN_0000 /dev/raw/raw8
NEW_DG_0000 /dev/raw/raw7
AWEN_0001 /dev/raw/raw9
DATA_0001 /dev/raw/raw4
DATA_0000 /dev/raw/raw3

8 rows selected.