ASM Diskgroup数据恢复终极方案PRM-DUL工具
Oracle ASM Diskgroup数据恢复终极方案PRM-DUL工具 下载最新版PRM: http://parnassusdata.com/sites/default/files/ParnassusData_PRMForOracle_3206.zip PRM用户手册： http://www.parnassusdata.com/sites/default/files/ParnassusData%20Recovery%20Manag
Oracle ASM Diskgroup数据恢复终极方案PRM-DUL工具
下载最新版PRM:
http://parnassusdata.com/sites/default/files/ParnassusData_PRMForOracle_3206.zip
PRM用户手册：
http://www.parnassusdata.com/sites/default/files/ParnassusData%20Recovery%20Manager%20For%20Oracle%20Database%E7%94%A8%E6%88%B7%E6%89%8B%E5%86%8C%20v0.3.pdf
ORACLE的ASM自动存储管理技术正被越来越多的企业采用，数据库采用ASM存储对比传统文件系统具有高性能、支持集群、管理方便等优势。 但ASM的问题在于，对于普通用户而言ASM的存储结构过于黑盒了，一旦ASM中的某个Disk Group的内部数据结构发生了损坏导致Disk Group无法被成功MOUNT，也就意味着用户重要的数据被锁死在这个ASM的黑盒中了。在这种场景中往往需要熟悉ASM内部数据结构的ORACLE原厂的资深工程师到达用户现场后通过手动修复ASM内部结构；而购买ORACLE原厂的现场服务对普通用户而言显得即昂贵又耗时。
基于PRM的研发人员(前ORACLE公司资深工程师)对ORACLE ASM内部数据结构的深入理解，PRM中加入了特别针对ASM的数据恢复功能。
PRM目前支持的ASM数据恢复功能包括：
1. 即便Disk Group无法正常MOUNT，仍可以通过PRM直接读取ASM磁盘上的可用的元数据metadata，并基于这些元数据将Disk Group中的ASM文件拷贝出来
2. 即便Disk Group无法正常MOUNT，仍可以通过PRM直接读取ASM上的数据文件，并抽取其中的数据，支持传统抽取方式和数据搭桥方式。
PRM对ASM的支持
| 功能 | Supported |
| 支持直接从ASM中抽取数据，无需拷贝到文件系统上 | YES |
| 支持从ASM中拷贝数据文件 | YES |
| 支持修复ASM metadata | YES |
| 支持图形化展示ASM黑盒 | Future |
社区版中ASM clone功能无任何限制，今后社区版将加入更多免费新特性
恢复场景6 从被损坏的ASM Diskgroup中拷贝出数据库数据文件
D公司开始采用ASM方案来替代文件系统和裸设备，但是由于使用的11.2.0.1版本ASM上Bug较多导致ASM DISKGROUP磁盘组无法加载MOUNT，通过多方修复ASM Disk Header无果。
此场景可以使用PRM的ASM Files Clone文件克隆功能从受损的ASM Diskgroup中拷贝出数据库数据文件。
- 打开主界面，菜单栏Tools选择ASM File(s) Clone:
- 进入ASM Disks界面，点击SELECT…按钮加入仍可用的ASM Disks，如/dev/asm-disk5(linux);确保加入所有可用LUN后，点击ASM analyze按钮
- ASM Files Clone将分析指定的ASM Disk的磁盘头，以便找出对应Disk group磁盘组中的文件，以及这些文件的分布位置(File Extent Map)； 这些信息均将记录到Derby数据库中以便今后使用； 可以说PRM将ASM的所有Metadata元数据均收集、分析、并存储起来，并通过各种形式来完善PRM的基本功能，并以图形化地方式展现给用户。
- ASM Analyze分析完成后，PRM将列出找到的ASM上文件的列表，用户可以勾选那些文件需要被克隆，并指定文件克隆的目标文件夹。
之后点击ASM Clone按钮，进入文件克隆阶段。
文件克隆阶段中，将列出ASM File的克隆进度，克隆完成后点击OK。
克隆阶段的进度日志输出如下：
| Preparing selected files…
Cloning +DATA2/ASMDB1/DATAFILE/TBS2.256.839732369: ……………………..1024MB ………………………………..2048MB ………………………………..3072MB ………………………………….4096MB ………………………………..5120MB ………………………………….6144MB ……………………………….7168MB …………………………………8192MB …………………………………9216MB …………………………………10240MB …………………………………11264MB …………………………………..12288MB …………………………………….13312MB …………………………….14336MB ……………………………………..15360MB ……………………………….16384MB …………………………………17408MB …………………………………18432MB …………………………………………………………………………………………….19456MB …………………………………… Cloned size for this file (in byte): 21475885056 Cloned successfully! Cloning +DATA2/ASMDB1/ARCHIVELOG/2014_02_17/thread_1_seq_47.257.839732751: …… Cloned size for this file (in byte): 29360128 Cloned successfully! Cloning +DATA2/ASMDB1/ARCHIVELOG/2014_02_17/thread_1_seq_48.258.839732751: …… Cloned size for this file (in byte): 1048576 Cloned successfully! All selected files were cloned done. |
- 可以通过dbv或者rman validate命令来验证克隆出来的数据文件，例如：
| rman target /
RMAN> catalog datafilecopy ‘/home/oracle/asm_clone/TBS2.256.839732369.dbf'; cataloged datafile copy datafile copy file name=/home/oracle/asm_clone/TBS2.256.839732369.dbf RECID=2 STAMP=839750901 RMAN> validate datafilecopy ‘/home/oracle/asm_clone/TBS2.256.839732369.dbf'; Starting validate at 17-FEB-14 using channel ORA_DISK_1 channel ORA_DISK_1: starting validation of datafile channel ORA_DISK_1: including datafile copy of datafile 00016 in backup set input file name=/home/oracle/asm_clone/TBS2.256.839732369.dbf channel ORA_DISK_1: validation complete, elapsed time: 00:03:35 List of Datafile Copies ======================= File Status Marked Corrupt Empty Blocks Blocks Examined High SCN —- —— ————– ———— ————— ———- 16?? OK???? 0????????????? 2621313????? 2621440???????? 1945051 File Name: /home/oracle/asm_clone/TBS2.256.839732369.dbf Block Type Blocks Failing Blocks Processed ———- ————– —————- Data?????? 0????????????? 0 Index????? 0????????????? 0 Other????? 0????????????? 127 Finished validate at 17-FEB-14
|
对于使用ASMLIB的ASM环境要如何使用PRM呢？
其实也很简单，asmlib相关的ASM DISK在OS操作系统上会以ll /dev/oracleasm/disks 的形式存放，例如：直接将/dev/oracleasm/disks下的文件加入到PRM ASM DISK中即可
| $ll /dev/oracleasm/diskstotal 0
brw-rw—-? 1 oracle dba 8,? 97 Apr 28 15:20 VOL001 brw-rw—-? 1 oracle dba 8,? 81 Apr 28 15:20 VOL002 brw-rw—-? 1 oracle dba 8,? 65 Apr 28 15:20 VOL003 brw-rw—-? 1 oracle dba 8,? 49 Apr 28 15:20 VOL004 brw-rw—-? 1 oracle dba 8,? 33 Apr 28 15:20 VOL005 brw-rw—-? 1 oracle dba 8,? 17 Apr 28 15:20 VOL006 brw-rw—-? 1 oracle dba 8, 129 Apr 28 15:20 VOL007 brw-rw—-? 1 oracle dba 8, 113 Apr 28 15:20 VOL008 |
直接将/dev/oracleasm/disks下的文件加入到PRM ASM DISK中即可。
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原文地址：ASM Diskgroup数据恢复终极方案PRM-DUL工具, 感谢原作者分享。
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