前几天采用amdu工具为客户恢复过Oracle 11g的一个数据库，后来仔细找了下资料，发现在10g上其实也可以使用该工具，但是需要自己安装
在ASM的OCR磁盘损坏后，数据库无法正常使用可以使用amdu将数据文件抽取出来，其实这个工具在10g也可以使用，不过需要配置安装才可以。，在10g的ASM中要使用AMDU工具，需要自行下载安装：
Linux X86 (Platform 46) amdu_lnx_32.zip linux binary iis7站长之家 amd64/em64t (platform 226) amdu_lnx_X86-64.zip Solaris 10 Sparc 64bit (Platform 23) amdu_solaris10_64.zip Solaris 9 Sparc 64bit (Platform 23) amdu_solaris9_64.zip hp-ux pa-risc 64bits (platform 59) amdu_HP-PARISC.zip HP-UX Itanium (Platform 197) amdu_hp_itanium.zip AIX amdu_aix.zip分别下载三个工具后，直接上传到ORACLE 软件目录一个目录，解压即为安装，解压后的文件目录下会存在如下四个文件：
1. amdu -- amdu binary
2. libclntsh.so.11.1
3. libnnz11.so
4. libskgxp11.so
$cd
$export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:`pwd`
or $setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:`pwd`
$export PATH=$PATH:`pwd` or setenv PATH ${PATH}:`pwd`
这时候可以使用amdu查看任意asm磁盘的相关信息：
-bash-3.2$ ./amdu -diskstring '/dev/raw/raw3'
amdu_2012_02_26_19_00_17/
运行后默认会生成一个 命名方式为amdu_YYYY_MM_DD_HH24_MM_SS文件夹，如上可见
-bash-3.2$ cd amdu_2012_02_26_19_00_17/
-bash-3.2$ ls
report.txt
-bash-3.2$ more report.txt
-*-amdu-*-
******************************* AMDU Settings ********************************
ORACLE_HOME = /opt/rac/database
System name: Linux
Node name: primary
Release: 2.6.18-164.el5
Version: #1 SMP Tue Aug 18 15:51:54 EDT 2009
Machine: i686
amdu run: 26-FEB-12 19:00:17
Endianess: 1
--------------------------------- Operations ---------------------------------
------------------------------- Disk Selection -------------------------------
-diskstring '/dev/raw/raw3'
------------------------------ Reading Control -------------------------------
------------------------------- Output Control -------------------------------
********************************* DISCOVERY **********************************
----------------------------- DISK REPORT N0001 ------------------------------
Disk Path: /dev/raw/raw3
Unique Disk ID:
Disk Label:
Physical Sector Size: 512 bytes
Disk Size: 8032 megabytes
Group Name: DATA
Disk Name: DATA_0000
Failure Group Name: DATA_0000
Disk Number: 0
Header Status: 3
Disk Creation Time: 2011/01/21 17:47:28.754000
Last Mount Time: 2012/02/15 09:44:27.166000
Compatibility Version: 0x0a100000
Disk Sector Size: 512 bytes
Disk size in AUs: 8032 AUs
Group Redundancy: 1
Metadata Block Size: 4096 bytes
AU Size: 1048576 bytes
Stride: 113792 AUs
group creation time: 2011/01/21 17:47:27.971000
File 1 Block 1 location: AU 2
******************************* END OF REPORT ********************************
导出DATA磁盘组的相关信息：
-bash-3.2$ ./amdu -diskstring '/dev/raw/raw*' -dump 'DATA'
amdu_2012_02_26_19_10_18/
这个时候会生成三个文件
如上三个文件分别是如下作用
1. report.txt
Like the name, it include details about the disks scanned (name, diskgroup name, failgroup name, size, creation time, etc).
2. *.map
For every diskgroup referenced on command -dump, will be a *.map file, which can be used to find the exact location of the ASM metadata on the disks. This file is a key component when reviewing specific areas of the metadata.
3. *.img
For each diskgroup, could be many image files. The size is limited to 2gb and will be a exact dump of the content of the diskgroup.