Mount Diskgroup without one disk

Hi All
We have on database of 6TB on raw devices. it's 10gr2 on IBM-AIX. We have plan to move raw to ASM. While going through recommendations it seems Oracle suggest
to have 2 Disk Groups. One for datafiles other for flash area.
We got nearly 25 LUNs assigned to this servers, LUNs are mapped to PV->VG Iwe have one to one mapping ) then VG have multiple logical volume which are being used as raw.
My question here is, if we have problem with LUN ( some corruption,yes, we have raid but please help to me understand theoretically) then we would loose few datafiles which are mapped to PV->VG.
But if we use same architecture in ASM where 25 LUNS assigned to one Diskgroup then whole diskgroup will not be mount which means whole db will be down.
Is there something I am missing ?
Regards,
Lyxx

can you please explain what you refer to as PV and VG?
If you use ASM to stripe over 25 disks/volumes/luns and you loose any one of them, your database will be unavailable. The slight advantage here is that all your data is striped over all disks which should result in better performance. But you are right, the diskgroup would not mount. Also, the mapping of multiple volumes for one physical disk (or raid) is not a good idea since it will not improve performance.
But you could also have ASM do some mirroring itself. For example, you could assign 24 disks/volumes to asm and mirror your data across 2 failover groups with 12 disks each. Of course, this would mean you'd have to use even more disks.
Or, if you want to stay as close to your current deployment as possible, you could setup 25 diskgroups and map them just the way you are mapping them now. In that way, when you loose a disk/volume/lun you will only loose one diskgroup and if the datafiles in that diskgroup are not critical, your database could still be up.
Bjoern

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使用AMDU工具从无法MOUNT的DISKGROUP中抽取数据文件

AMDU是ORACLE针对ASM开发的源数据转储工具，其全称为ASM Metadata Dump Utility(AMDU)
AMDU具体以下三个主要功能：
1. 将ASM DISK上的元数据转储到文件系统上以便分析
2. 将ASM文件的内容抽取出来并写入到OS文件系统，Diskgroup是否mount均可
3. 打印出块的元数据，以块中C语言结构或16进制的形式
这里我们将用到使用AMDU抽取ASM DISKGROUP中的数据文件； ASM作为近几年最流行的存储解决方案，大家对他的优缺点都有所了解，其中的问题之一就是ASM是个黑盒。一旦DISKGROUP无法MOUNT起来就意味着传统方法无法以磁盘为基础导出任何数据。
AMDU解决了这一问题，这里我们仅讨论在ASM DISKGROUP 无法MOUNT的情况下的范畴，不讨论RDBMS数据文件在ASM下讹误的处理。
注意 AMDU虽然是11g才发布的工具，但是实际对10g的ASM 也有效。
当前你可能遇到的场景是， ORACLE DATABASE的SPFILE、CONTROLFILE、DATAFILE均存放在ASM DISKGROUP中，而由于一些ASM ORA-600错误导致无法MOUNT该DISKGROUP，你需要的是使用AMDU将这些文件从ASM DISK中转储出来。
场景 1 丢失了包括SPFILE、CONTROLFILE、DATAFILE
恢复步骤：从备份中还原出SPFILE ，即便没有SPFILE的话PFILE也可以，总之你需要从参数文件中了解control_files的信息
SQL> show parameter control_files
NAME                                 TYPE        VALUE
control_files                        string      +DATA/prodb/controlfile/curren
                                                 t.260.794687955, +FRA/prodb/co
                                                 ntrolfile/current.256.79468795
                                                 5获得control_files 控制文件在ASM中的位置后事情就好办了，+DATA/prodb/controlfile/current.260.794687955 这里 260是这个控制文件在+DATA 这个DISKGROUP中的FILE NUMBER
此外我们还需要ASM DISK的DISCOVERY PATH信息，这完全可以从ASM的SPFILE中的asm_diskstring 参数获得
[oracle@mlab2 oracle.SupportTools]$ unzip amdu_X86-64.zip
Archive: amdu_X86-64.zip
inflating: libskgxp11.so
inflating: amdu
inflating: libnnz11.so
inflating: libclntsh.so.11.1
[oracle@mlab2 oracle.SupportTools]$ export LD_LIBRARY_PATH=./
[oracle@mlab2 oracle.SupportTools]$ ./amdu -diskstring '/dev/asm*' -extract data.260
amdu_2009_10_10_20_19_17/
AMDU-00204: Disk N0006 is in currently mounted diskgroup DATA
AMDU-00201: Disk N0006: '/dev/asm-disk10'
AMDU-00204: Disk N0003 is in currently mounted diskgroup DATA
AMDU-00201: Disk N0003: '/dev/asm-disk5'
AMDU-00204: Disk N0002 is in currently mounted diskgroup DATA
AMDU-00201: Disk N0002: '/dev/asm-disk6'
[oracle@mlab2 oracle.SupportTools]$ cd amdu_2009_10_10_20_19_17/
[oracle@mlab2 amdu_2009_10_10_20_19_17]$ ls
DATA_260.f report.txt
[oracle@mlab2 amdu_2009_10_10_20_19_17]$ ls -l
total 9548
-rw-r--r-- 1 oracle oinstall 9748480 Oct 10 20:19 DATA_260.f
-rw-r--r-- 1 oracle oinstall    9441 Oct 10 20:19 report.txt以上转储出来的DATA_260.f 就是控制文件，我们使用该控制文件startup mount RDBMS实例：
SQL> alter system set control_files='/opt/oracle.SupportTools/amdu_2009_10_10_20_19_17/DATA_260.f' scope=spfile;
System altered.
SQL> startup force mount;
ORACLE instance started.
Total System Global Area 1870647296 bytes
Fixed Size                  2229424 bytes
Variable Size             452987728 bytes
Database Buffers         1409286144 bytes
Redo Buffers                6144000 bytes
Database mounted.
SQL> select name from v$datafile;
NAME
+DATA/prodb/datafile/system.256.794687873
+DATA/prodb/datafile/sysaux.257.794687875
+DATA/prodb/datafile/undotbs1.258.794687875
+DATA/prodb/datafile/users.259.794687875
+DATA/prodb/datafile/example.265.794687995
+DATA/prodb/datafile/mactbs.267.794688457
6 rows selected.startup mount实例后，可以从v$datafile中获得数据文件名，其中就包括了其在DISKGROUP中的FILE NUMBER
再使用./amdu -diskstring '/dev/asm*' -extract 命令即可导出数据文件到操作系统
[oracle@mlab2 oracle.SupportTools]$ ./amdu -diskstring '/dev/asm*' -extract data.256
amdu_2009_10_10_20_22_21/
AMDU-00204: Disk N0006 is in currently mounted diskgroup DATA
AMDU-00201: Disk N0006: '/dev/asm-disk10'
AMDU-00204: Disk N0003 is in currently mounted diskgroup DATA
AMDU-00201: Disk N0003: '/dev/asm-disk5'
AMDU-00204: Disk N0002 is in currently mounted diskgroup DATA
AMDU-00201: Disk N0002: '/dev/asm-disk6'
[oracle@mlab2 oracle.SupportTools]$ cd amdu_2009_10_10_20_22_21/
[oracle@mlab2 amdu_2009_10_10_20_22_21]$ ls
DATA_256.f report.txt
[oracle@mlab2 amdu_2009_10_10_20_22_21]$ dbv file=DATA_256.f
DBVERIFY: Release 11.2.0.3.0 - Production on Sat Oct 10 20:23:12 2009
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
DBVERIFY - Verification starting : FILE = /opt/oracle.SupportTools/amdu_2009_10_10_20_22_21/DATA_256.f
DBVERIFY - Verification complete
Total Pages Examined         : 90880
Total Pages Processed (Data) : 59817
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 12609
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 3637
Total Pages Processed (Seg) : 1
Total Pages Failing   (Seg) : 0
Total Pages Empty            : 14817
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Total Pages Encrypted        : 0
Highest block SCN            : 1125305 (0.1125305)@@
如何在OTN中文技术论坛提一个问题？
论坛礼仪需知及学习oracle的方法论
Maclean Liu
Oracle Database Administrator
Oracle Certified 10g/11g Master
www.askmaclean.com

楼主，你好。我们现在也是按此方案正在进行，但有一个技术点
./amdu -diskstring '/dev/asm*' -extract data.260
asm 实例不能mount 起来
其中260 这个号是asm filenumber 有的数据文件是名字是这样的
+DG_ORA/mos5200/datafile/pm4h_db94.dbf
从文件名上不能看到260这样的number
可能是因为asm不能mount ,从v$asm_file 里也只能看到部分文件
oracle 提供了一个方案把extract 出来的文件对其block0 dump,可是asm 里的文件太多了归档也放在里面了，不太具有可行性
如何解决呢,ML想个办法,谢谢

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user12039625 wrote:
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Thanks for doc id but I am looking for noarchive mode solution. becaues I got ORA-
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Hi All,
Our db is 10.2.0.3 RAC db. And database servers are window 2003 server.
We need to move more than 50 redo logs (some are regular and some are standby) which are not redundant from one disk group to another. Say we need to move from disk group 1 to 2. Here are the options we are thinking about but not sure which one is the best from easiness and safety prospective.
Thank you very much for your help in advance.
Shirley
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Absolutely not, they are not even remotely similar concepts.
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EMC. http://www.emc.com No further commens on it.
~ Madrid
http://hrivera99.blogspot.com

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Shared Storage: A5200
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host2 No Online
scal-racfs-rg host1 No Online
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host2 No Offline
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---

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I have attempted to mount a D130 disk array attached
to an E420R system running Solaris 10. This array has
three drives installed an formatted. I would like to
mount the three disks as one large storage partition.
It seems to me that I want a concatenated stripe but
I am not really sure.Either a concatenation or a stripe. I'm not sure what a concatenated stripe is.
Neither will offer redundancy. A concatenation can be more easily extended in the future, while a stripe would offer better performance in most situations.
metastat
d1: Concat/Stripe
Size: 106067120 blocks (50 GB)
Stripe 0:
Device Start Block Dbase Reloc
c0t4d0s6 9424 No Yes
Stripe 1:
Device Start Block Dbase Reloc
c0t3d0s6 4712 No Yes
Stripe 2:
Device Start Block Dbase Reloc
c0t2d0s6 4712 No YesSo a 3 column stripe totalling 50G.
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Please verify my procedure and tell me the precautions that I should take care :=)
regards,

Werner,
If this is an active databases (indexes are used),
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Scott user:
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Table created.
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Index created.
SQL>insert into t2 values (sysdate,1);
1 row created.
SQL>insert into t2 values (sysdate,2);
1 row created.
SQL>insert into t2 values (sysdate,10);
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2 from dba_segments
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T2_IND                         INDEX              INDS
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scott user:
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1 row created.
SQL>
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COL1              ID
22-NOV-07          1
22-NOV-07          2
22-NOV-07         10
22-NOV-07         20
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If so, check following steps:
Note that this will format and repartition the new disk and restore the volumes contained in the image. This will restore the OS, applications and data contained in the critical volumes (volumes required for Windows to run). You can restore
the data on the other partitions on the disk from a file backup of required data from the old disk. I am assuming you have a file backup of your data as well.
1) Create a System Image backup to the USB drive. When prompted to create a ‘System Repair’ disk, do so.
2) Shutdown the computer and remove the hard drive power and SATA connectors from your original Windows 7 hard drive and any additional internal hard drives.
3) Connect the power and SATA connector to the new hard drive. At this point this should be your only internal hard drive connected to the computer’s motherboard.
4) Boot from the ‘System Repair’ disc.
5) Verify the keyboard input method and click ‘Next’.
6) Select the ‘Restore your computer using a system image that you created’ option located in the lower left and click ‘Next’.
7) A scan for system images that are on your USB drive will begin. At completion of the scan you will have the option to ‘Use the latest available system image’ or ‘Select a system image’. Choose the recommended option and use the latest available system
image and click ‘Next’.
8) Choose additional restore options: Note: The ‘Format and repartition disks’ option will be check marked but disabled/grayed out. Click ‘Next’.
9) The ‘Your computer will be restored from the following system image:’ information will be displayed. Click ‘Finish’.
10) Re-image Your Computer prompt. You will now see a pop up with the following message: All data to be restored will be formatted and replaced with the layout and data in the system image. Are you sure you want to continue? Click ‘Yes’.
11) Windows will now start restoring the image to the new hard drive.
12) At the completion of the image restoration your computer will reboot, sit back and wait for Windows to start and then logon as you normally do, then remove the System Repair disc.
13) You may be prompted to restart the computer to apply changes. Restart the computer.
Kate Li
TechNet Community Support

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