Re: does ASM recognize and allow for major/minor device numbers

<oracledoctor_at_gmail.com> wrote in message news:1147195903.596111.258940_at_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
>

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?!?!"
---

WARNING:
DO NOT REPLY TO THIS EMAIL
Reply to me only on this newsgroup