Re: ASM disk group

On 7/6/05, Murali Vallath <murali_vallath_at_yahoo.com> wrote:
>
> You may have already found a solution.
> 1. You may not drop the pointers at the O/S level. ASM has some header
> information that will have to be removed using a dd command
>

Owa Tago Siam! http://www.cinerhama.com/tvpage/seventies/oddcouple.html

>From an article *I* wrote:

It is very possible that ASM is reading header information from the disk that marks it as already belonging to an ASM disk group. This can happen if the disk or partition was previously used in ASM with Linux I/O, as happened on my test server.

The solution to this problem (provided by Martin Berg) was to write over the first 64k of the disk, erasing the old ASM header.

*Note: This is a very dangerous command! Do not use this unless you are 100 percent sure you are writing to the correct partition, and that you have backups!*

I do not recommend that you use this command, but it did work for the test server on which ASM was installed.

dd if=/dev/zero of=/dev/hda5 bs=1024 count=64

The full article is at: http://www.dbazine.com/olc/olc-articles/still5

-- 
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist

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