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#1 (**permalink**) 02-25-2008, 04:20 AM

We are looking at the need of Veritas for Orcle RAC since we are
planning on using ASM as our storage management system. The argument
that has been put forth by the sys admins is that Veritas takes care of
the devices 'under the covers'.

Say we had an HBA card that was device 1 and the disks attached where
1,2,3 and 4 so the major/minor numbes looked like this:

1,1
1,2
1,3
1,4

and we has a CD ROM device that was 2,1

we loose the HBA card and replace it with a new one. That device major
number is now 3, making the major/minor numbers of that new HBA card:

3,1
3,2
3,3
3,4

How does ASM handle this? Is this something that the sys admins now
need to track?

Any help is welcome.

Sebastian

#2 (**permalink**) 02-25-2008, 04:20 AM

On Tue, 9 May 2006 19:31:43 +0200, oracledoctor@gmail.com wrote
(in article <1147195903.596111.258940@i40g2000cwc.googlegroups .com>):

> We are looking at the need of Veritas for Orcle RAC since we are
> planning on using ASM as our storage management system. The argument
> that has been put forth by the sys admins is that Veritas takes care of
> the devices 'under the covers'.
>
> Say we had an HBA card that was device 1 and the disks attached where
> 1,2,3 and 4 so the major/minor numbes looked like this:
>
> 1,1
> 1,2
> 1,3
> 1,4
>
> and we has a CD ROM device that was 2,1
>
> we loose the HBA card and replace it with a new one. That device major
> number is now 3, making the major/minor numbers of that new HBA card:
>
> 3,1
> 3,2
> 3,3
> 3,4
>
> How does ASM handle this? Is this something that the sys admins now
> need to track?
>
> Any help is welcome.
>
> Sebastian
>

I think you will need to re create the device files. ASM just knows the
device file names and won't do anything with the major/minor numbers.

--
With kind regards / met vriendelijke groeten,
Ronald

http://ronr.blogspot.com/
http://homepage.mac.com/ik_zelf/oracle

#3 (**permalink**) 02-25-2008, 04:20 AM

My guess is that you have to "whack" what ASM considers to be the old
disks and add new disks via ASM.

What does ASM think a disk is? I believe anything that you tell it
that a disk is.

Oracle support may be a good place to chase down some additional
details/confirmation or further advice.

#4 (**permalink**) 02-25-2008, 04:20 AM

<oracledoctor@gmail.com> wrote in message
news:1147195903.596111.258940@i40g2000cwc.googlegr oups.com...
> We are looking at the need of Veritas for Orcle RAC since we are
> planning on using ASM as our storage management system. The argument
> that has been put forth by the sys admins is that Veritas takes care of
> the devices 'under the covers'.
>
> Say we had an HBA card that was device 1 and the disks attached where
> 1,2,3 and 4 so the major/minor numbes looked like this:
>
> 1,1
> 1,2
> 1,3
> 1,4
>
> and we has a CD ROM device that was 2,1
>
> we loose the HBA card and replace it with a new one. That device major
> number is now 3, making the major/minor numbers of that new HBA card:
>
> 3,1
> 3,2
> 3,3
> 3,4
>
> How does ASM handle this? Is this something that the sys admins now
> need to track?
>
> Any help is welcome.
>
> Sebastian
>

Simple,

Make the disks, connected from a different card, available to ASM through
ASM_diskstring and ASM will automatically know they belong to diskgroup x.
How does ASM know this? ASM writes a header to each disk it manages.

If you use asmlib, just add the disks back (/etc/init.d/oracleasm createdisk
.... etc).
If you use raw, make them available to ASM.

HTH

--
Andreas
Oracle 9i Certified Professional
Oracle 10g Certified Professional
Oracle 9i Certified PL/SQL Developer

"If you don't eat your meat, you cannot have any pudding.
"How can you have any pudding if you don't eat your meat?!?!"
---

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DO NOT REPLY TO THIS EMAIL
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does ASM recognize and allow for major/minor device numbers