系统环境：
操作系统：RedHat EL5
Cluster： Oracle GI(Grid Infrastructure)
Oracle： Oracle 11.2.0.1.0
如图所示：RAC 系统架构
Oracle RAC是一个DataBase可以通过多个Instance访问，每个节点都有一个Instance，所有的Instance对共享的存储都有读写的权限，在共享存储上可以存放Datafile、controlfile、redolog、spfile、archive log等文件。
RAC的共享存储一般可以采用OCFS和ASM方式，Oracle推荐首选ASM存储方式。
二、配置RAC共享存储（all nodes）
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1
、首先在linux下要安装ASM驱动软件
[root
@node1
~]# uname -a
Linux node1
2.6
.
18
-
194
.el5 #
1
SMP Tue Mar
16
21
:
52
:
43
EDT
2010
i686 i686 i386 GNU/Linux
[root
@node1
asm]# ls -l
total
236
-rwxr--r--
1
500
500
130018
May
9
2012
oracleasm-
2.6
.
18
-
194
.el5-
2.0
.
5
-
1
.el5.i686.rpm
-rwxr--r--
1
500
500
13929
Apr
11
2010
oracleasmlib-
2.0
.
4
-
1
.el5.i386.rpm
-rwxr--r--
1
500
500
85382
Apr
11
2010
oracleasm-support-
2.1
.
3
-
1
.el5.i386.rpm
安装软件注意要和系统的内核相匹配，并且
32
位的内核要选择i386/i686,
64
位要选择
64
位的软件包
[root
@node1
asm]# rpm -ivh *
warning: oracleasm-
2.6
.
18
-
194
.el5-
2.0
.
5
-
1
.el5.i686.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
Preparing... ########################################### [
100
%]
1
:oracleasm-support ########################################### [
33
%]
2
:oracleasm-
2.6
.
18
-
194
.el########################################### [
67
%]
3
:oracleasmlib ########################################### [
100
%]
2
、建立共享磁盘分区
[root
@node1
asm]# fdisk -l
Disk /dev/sdb:
22.7
GB,
22769827840
bytes
255
heads,
63
sectors/track,
2768
cylinders
Units = cylinders of
16065
*
512
=
8225280
bytes
Device Boot Start End Blocks Id System
/dev/sdb1
1
125
1004031
83
Linux
/dev/sdb2
126
2768
21229897
+
5
Extended
/dev/sdb5
126
250
1004031
83
Linux
/dev/sdb6
251
375
1004031
83
Linux
/dev/sdb7
376
874
4008186
83
Linux
/dev/sdb8
875
1373
4008186
83
Linux
/dev/sdb9
1374
1872
4008186
83
Linux
/dev/sdb10
1873
2371
4008186
83
Linux
/dev/sdb11
2372
2496
1004031
83
Linux
/dev/sdb12
2497
2621
1004031
83
Linux
/dev/sdb13
2622
2768
1180746
83
Linux
ASM DISK 可以通过Linux分区或raw设备建立！
3
、建立ASM DISK
[root
@node1
soft]# service oracleasm configure
Configuring the Oracle ASM library driver.
This will configure the on-boot properties of the Oracle ASM library
driver. The following questions will determine whether the driver is
loaded on boot and what permissions it will have. The current values
will be shown in brackets (
'[]'
). Hitting <ENTER> without typing an
answer will keep that current value. Ctrl-C will abort.
Default user to own the driver
interface
[]: grid
Default group to own the driver
interface
[]: asmadmin
Start Oracle ASM library driver on boot (y/n) [n]: y
Scan
for
Oracle ASM disks on boot (y/n) [y]:
Writing Oracle ASM library driver configuration: done
Initializing the Oracle ASMLib driver: [ OK ]
Scanning the system
for
Oracle ASMLib disks: [ OK ]
[root
@node1
soft]#
建立oracle asm 磁盘:
[root
@node1
soft]# service oracleasm
Usage: /etc/init.d/oracleasm {start|stop|restart|enable|disable|configure|createdisk|deletedisk|querydisk|listdisks|scandisks|status}
[root
@node1
soft]# service oracleasm createdisk OCR_VOTE1 /dev/sdb1
Marking disk
"OCR_VOTE1"
as an ASM disk: [ OK ]
[root
@node1
soft]# service oracleasm createdisk OCR_VOTE2 /dev/sdb5
Marking disk
"OCR_VOTE2"
as an ASM disk: [ OK ]
[root
@node1
soft]# service oracleasm createdisk OCR_VOTE3 /dev/sdb6
Marking disk
"OCR_VOTE3"
as an ASM disk: [ OK ]
11G RAC将ocr和vote disk存放在ASM diskgroup管理，如果建立normal redundancy需要
3
块盘
[root
@node1
soft]# service oracleasm createdisk ASM_DATA1 /dev/sdb7
Marking disk
"ASM_DATA1"
as an ASM disk: [ OK ]
[root
@node1
soft]# service oracleasm createdisk ASM_DATA2 /dev/sdb8
Marking disk
"ASM_DATA2"
as an ASM disk: [ OK ]
ASM_DATA1，ASM_DATA2 用于建立存储database的diskgroup
[root
@node1
soft]# service oracleasm createdisk ASM_RCY1 /dev/sdb9
Marking disk
"ASM_RCY1"
as an ASM disk: [ OK ]
[root
@node1
soft]# service oracleasm createdisk ASM_RCY2 /dev/sdb10
Marking disk
"ASM_RCY2"
as an ASM disk: [ OK ]
ASM_RCY1，ASM_RCY2用于创建存储recovery area的diskgroup
[root
@node1
soft]# service oracleasm listdisks
ASM_DATA1
ASM_DATA2
ASM_RCY1
ASM_RCY2
OCR_VOTE1
OCR_VOTE2
OCR_VOTE3
在其他节点：
[root
@node2
asm]# service oracleasm scandisks
Scanning the system
for
Oracle ASMLib disks: [ OK ]
[root
@node2
asm]# service oracleasm listdisks
ASM_DATA1
ASM_DATA2
ASM_RCY1
ASM_RCY2
OCR_VOTE1
OCR_VOTE2
OCR_VOTE3
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@至此，在RAC下的共享存储配置完成！
本文转自 客居天涯 51CTO博客，原文链接：http://blog.51cto.com/tiany/1423004，如需转载请自行联系原作者
