Why the ASM disks can't be used again?

Platform: Suse9(2.6.5-7smp)Linux x86_64, Oracle10g(10.1.0.3) RAC with ASM on 8 nodes and 30TB raw disks.
Problem:
In the first time, we created a db with a ASM Disk Group named RAC_DATA. But because of some errors we decided uninstall them. The uninstallation steps included removing all db and asm instances, rac software and crs software by dbca and oui. And cleared the shared ocr.crs and vote.crs in device raw1 and raw2.
In the second time, we installed the crs and rac successfully. But when we ran dbca to recreate a database, all asm disks are unavailable, they all still belongs to the RAC_DATA group . But we have deleted RAC_DATA group in the uninstallation. What's more, we removed all in $ORACLE_HOME, $ORACLE_BASE/admin and $ORACLE_CRS_HOME.
I don't know where the information about asm disks group stored. How can I clear it completely and reuse these disks them again.

The problem is the that ASM metadata still exists. You can use the dd command to clear the metadata from the ASM disks.
dd if=/dev/zero of=/dev/raw/raw1 bs=8192 count=12800
Substitute the name of your device for /dev/raw/raw1 above. For further information see metalink note 26848.1 Re-Creating ASM instances and Diskgroups.

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http://social.technet.microsoft.com/Forums/en-US/windowsbackup/thread/871a0216-fbaf-4a0c-83aa-1e02ae90dbe4
http://social.technet.microsoft.com/Forums/en-US/windowsbackup/thread/9a082b90-bd7c-46f8-9eb3-9581f9d5efdd
http://social.technet.microsoft.com/Forums/en-US/windowsbackup/thread/11d8c552-a841-49ac-ab2e-445e6f95e704
Regards,
Vikas Ranjan [MSFT]
------- This information is provided as-is without any warranties, implicit or explicit.-------

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hi
use the following linux command as root:
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hth

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Are there anyone who encountered creating a database using DBCA with ASM as file system?
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Edited by: 822505 on Dec 20, 2010 7:47 PM

822505 wrote:
Are there anyone who encountered creating a database using DBCA with ASM as file system?
Our issue before is in both nodes the DBCA did not see the ASM disk group.
But after setting the TNS_ADMIN in both nodes and running the DBCA as administrator in Node 1, the DBCA able to see now the ASM disk group. Unfortunately, in Node 2 it didn't work out?
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For you information, we are using Windows 64-bit, Oracle 11g R2
Thank you in advance for those who will respond.
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Hi,
>>>>>>>>>>>>>>>>>>>>> Please do not try this on production. >>>>>>>>>>>>>>>>>>>>>
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Why the ASM disks can't be used again?

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