1.安装Oracle,不建数据库

2.下载oracleasm-support、oracleasm、oracleasmlib
   http://www.oracle.com/technology/software/tech/linux/asmlib/rhel4.html

   安装这三个包 rpm -UVH 包名

3.准备四个磁盘
   sdb1,sdc1,sdd1,sde1

4.准备配置ASM:
  root下运行
    /etc/init.d/oracleasm  configure
  手动加载asmlib driver
    /etc/init.d/oracleasm  enable
  建ASM磁盘
    /etc/init.d/oracleasm VOL1 /dev/sdb1
    /etc/init.d/oracleasm VOL2 /dev/sdc1
    /etc/init.d/oracleasm VOL3 /dev/sdd1
    /etc/init.d/oracleasm VOL4 /dev/sde1
    /etc/init.d/oracleasm listdisks

5.建ASM实例
   建初始文件
    cd $ORACLE_HOME/dbs
    vi init+ASM.ora

   建密码文件
    orapwd file=orapwd+ASM password= dba

   建目录结构
    mkdir -p $ORACLE_BASE/admin/+ASM/udump
    mkdir -p $ORACLE_BASE/admin/+ASM/bdump
    mkdir -p $ORACLE_BASE/admin/+ASM/cdump

   启动实例
    export ORACLE_SID=+ASM
    sqlplus / as sysdba
    startup
   
   建spfile
    create spfile from pfile

   建diskgroup
    create diskgroup dgroup1 normal redundancy
    failgroup fgroup1 disk 'orcl:VOL1','orcl:VOL2'
    failgroup fgroup2 disk 'orcl:VOL3','orcl:VOL4';

   查看
    select name,state from v$asm_diskgroup;

    show parameter asm_diskgroups

6.建ASM数据库
    运行dbca
     sid为asmdemo
     磁盘组选择dgroup1

7.启动ASM数据库
  export ORACLE_SID=+ASM
  sqlplus / as sysdba
  startup
  exit

  export ORACLE_SID=asmdemo
  sqlplus / as sysdba
  startup
  exit

8.关闭
  export ORACLE_SID=asmdemo
  sqlplus / as sysdba
  shutdown immediate
  exit

最好换个session
  export ORACLE_SID=+ASM
  sqlplus / as sysdba
  shutdown immediate
  exit