linux查看裸设备及oracle如何添加磁盘到磁盘组

linux查看裸设备

1.fdisk -l 查看所有系统中的裸设备使用情况，包括分区的和没有分区的

2.对裸设备进行分区

eg:fdisk /dev/sdf 依次需要输入：n|p|1|w

3.配置裸设备映射

rh4: 编辑 /etc/sysconfig/rawdevices

eg:/dev/raw/raw5 /dev/sdf1

4.配置oracle用户对裸设备的权限，编辑/etc/udev/permissions.d/50-udev.permissions

#raw devices

raw*:oracle:oinstall:0660

raw/*:oracle:oinstall:0660

5.确认裸设备自动启动

#chkconfig --list rawdevices

rawdevices 0:off 1:off 2:off 3:on 4:on 5:on 6:off

6.启动rawdevices服务，确认裸设备创建成功

#service rawdevices restart

7.检查裸设备权限是否是oracle:oinstall

cd /dev/raw

ll

8.创建ASM磁盘

#/etc/init.d/oracleasm createdisk VOL3 /dev/sdf1

其他节点需要

#/etc/init.d/oracleasm scandisks

ASMLib方式：

alter system set asm_diskstring='ORCL:VOL*' scope=both;

create diskgroup RAC_DISK external redundancy DISK 'ORCL:VOL1','ORCL:VOL3','ORCL:VOL4';

drop diskgroup asmdisk including contents

裸设备方式：

alter system set asm_diskstring='/dev/raw/raw[1-6]' scope=both

alter diskgroup RAC_DISK add disk '/dev/oracleasm/VOL1' name VOL1,'/dev/oracleasm/VOL3' name VOL3,'/dev/oracleasm/VOL4' name VOL4;

col state format a10

col name format a15

col failgroup format a20

set line 200

select STATE,REDUNDANCY,TOTAL_MB,FREE_MB,NAME,FAILGROUP from v$asm_disk;

select GROUP_NUMBER,NAME,STATE,TYPE,TOTAL_MB,FREE_MB,UNBALANCED from v$asm_diskgroup;