AMDU是一個從一個或多個ASM磁碟提取所有活動後設資料資訊，或者格式化列印輸出單一的塊的工具。這個工具不需要任何磁碟組被MOUNT。AMDU是從11.1版本開始安裝，雖然這個工具是11g釋出的，但是它也能用於ASM 10g。

dump磁碟組相關後設資料的語法如下：
amdu -diskstring '' -dump ''

amdu -help可以看到詳細的幫助資訊。

每次執行AMDU在當前位置都有一個目錄被建立，除非使用引數-directory進行覆蓋。
目錄的格式為：amdu_YYYY_MM_DD_HH24_MM_SS。

預設命令將生成以下的檔案：
_0001.img 磁碟組內容精確的DUMP；大小限制在2gb，但是能多於一個檔案。
.map 能用於找到磁碟ASM後設資料的精確位置。
report.txt 包含磁碟掃描的詳細資訊。

report.txt檔案顯示資料磁碟組的磁碟的頭資訊，例如：
[grid@rhel1 ~]$ amdu -diskstring '/dev/raw/raw*' -dump 'DGOCR'
amdu_2014_04_14_19_11_00/
[grid@rhel1 ~]$ cd amdu*
[grid@rhel1 amdu_2014_04_14_19_11_00]$ ls
DGOCR_0001.img DGOCR.map report.txt
[grid@rhel1 amdu_2014_04_14_19_11_00]$ cat report.txt
-*-amdu-*-

******************************* AMDU Settings ********************************
ORACLE_HOME = /u01/app/11.2.0/grid
System name: Linux
Node name: rhel1.localdomain
Release: 2.6.18-164.el5xen
Version: #1 SMP Tue Aug 18 15:59:52 EDT 2009
Machine: x86_64
amdu run: 14-APR-14 19:11:00
Endianess: 1

--------------------------------- Operations ---------------------------------
-dump DGOCR

------------------------------- Disk Selection -------------------------------
-diskstring '/dev/raw/raw*'

------------------------------ Reading Control -------------------------------

------------------------------- Output Control -------------------------------

********************************* DISCOVERY **********************************

----------------------------- DISK REPORT N0001 ------------------------------
Disk Path: /dev/raw/raw1
Unique Disk ID:
Disk Label:
Physical Sector Size: 512 bytes
Disk Size: 2047 megabytes
Group Name: DGOCR
Disk Name: DGOCR_0002
Failure Group Name: DGOCR_0002
Disk Number: 2
Header Status: 3
Disk Creation Time: 2012/10/21 10:39:21.696000
Last Mount Time: 2013/05/01 20:42:43.751000
Compatibility Version: 0x0b200000(11020000)
Disk Sector Size: 512 bytes
Disk size in AUs: 2047 AUs
Group Redundancy: 2
Metadata Block Size: 4096 bytes
AU Size: 1048576 bytes
Stride: 113792 AUs
Group Creation Time: 2012/10/21 10:39:21.428000
File 1 Block 1 location: AU 2
OCR Present: YES

----------------------------- DISK REPORT N0002 ------------------------------
Disk Path: /dev/raw/raw3
Unique Disk ID:
Disk Label:
Physical Sector Size: 512 bytes
Disk Size: 2047 megabytes
Group Name: DGOCR
Disk Name: DGOCR_0001
Failure Group Name: DGOCR_0001
Disk Number: 1
Header Status: 3
Disk Creation Time: 2012/10/21 10:39:21.696000
Last Mount Time: 2013/05/01 20:42:43.751000
Compatibility Version: 0x0b200000(11020000)
Disk Sector Size: 512 bytes
Disk size in AUs: 2047 AUs
Group Redundancy: 2
Metadata Block Size: 4096 bytes
AU Size: 1048576 bytes
Stride: 113792 AUs
Group Creation Time: 2012/10/21 10:39:21.428000
File 1 Block 1 location: AU 2
OCR Present: YES

***************** Slept for 6 seconds waiting for heartbeats *****************

************************** SCANNING DISKGROUP DGOCR **************************
Creation Time: 2012/10/21 10:39:21.428000
Disks Discovered: 2
Redundancy: 2
AU Size: 1048576 bytes
Metadata Block Size: 4096 bytes
Physical Sector Size: 512 bytes
Metadata Stride: 113792 AU
Duplicate Disk Numbers: 0

---------------------------- SCANNING DISK N0002 -----------------------------
Disk N0002: '/dev/raw/raw3'
Allocated AU's: 309
Free AU's: 1738
AU's read for dump: 102
Block images saved: 23302
Map lines written: 102
Heartbeats seen: 0
Corrupt metadata blocks: 0
Corrupt AT blocks: 0

---------------------------- SCANNING DISK N0001 -----------------------------
Disk N0001: '/dev/raw/raw1'
Allocated AU's: 309
Free AU's: 1738
AU's read for dump: 102
Block images saved: 23302
Map lines written: 102
Heartbeats seen: 0
Corrupt metadata blocks: 0
Corrupt AT blocks: 0

------------------------ SUMMARY FOR DISKGROUP DGOCR -------------------------
Allocated AU's: 618
Free AU's: 3476
AU's read for dump: 204
Block images saved: 46604
Map lines written: 204
Heartbeats seen: 0
Corrupt metadata blocks: 0
Corrupt AT blocks: 0

******************************* END OF REPORT ********************************

參考文章：《ASM tools used by Support : KFOD, KFED, AMDU (文件 ID 1485597.1)》。

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使用AMDU DUMP ASM磁碟後設資料資訊

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