Deleting an raid device

Deleting an raid device

[me]

Hi,

What are the proper steps for deleting all remnants of a previous raid
install?

I've done:
mdadm --stop /dev/md0
mdadm --zero-superblock /dev/md0

But I still see it getting stopped on shutdown.

Thanks
Jay

Re: Deleting an raid device

[Brad Campbell]

me@heyjay.com wrote:
> Hi,
> 
> What are the proper steps for deleting all remnants of a previous raid
> install?

<I inserted some lame joke here using /dev/zero and dd but I re-thought it after picturing someone 
blindly doing a cut and paste, then cursing me for zeroing their boot disk by mistake.>

> I've done:
> mdadm --stop /dev/md0
> mdadm --zero-superblock /dev/md0
> 
> But I still see it getting stopped on shutdown.

Have you blitzed the /etc/raidtab file? (If you had one that is)
You may be seeing your distribution trying to shutdown the array on shutdown rather than something 
actually being stopped.

Regards,
Brad

Re: Deleting an raid device

[me]

I'm using Debian, and mdadm.

I thought mdadm didn't us the /etc/raidtab file anymore

Jay
----- Original Message ----- 
From: "Brad Campbell" <brad@wasp.net.au>
To: <me@heyjay.com>
Cc: <linux-raid@vger.kernel.org>
Sent: Tuesday, May 25, 2004 8:10 AM
Subject: Re: Deleting an raid device


> me@heyjay.com wrote:
> > Hi,
> >
> > What are the proper steps for deleting all remnants of a previous raid
> > install?
>
> <I inserted some lame joke here using /dev/zero and dd but I re-thought it
after picturing someone
> blindly doing a cut and paste, then cursing me for zeroing their boot disk
by mistake.>
>
> > I've done:
> > mdadm --stop /dev/md0
> > mdadm --zero-superblock /dev/md0
> >
> > But I still see it getting stopped on shutdown.
>
> Have you blitzed the /etc/raidtab file? (If you had one that is)
> You may be seeing your distribution trying to shutdown the array on
shutdown rather than something
> actually being stopped.
>
> Regards,
> Brad
>
>
>

Re: Deleting an raid device

[Brad Campbell]

me@heyjay.com wrote:
> I'm using Debian, and mdadm.
> 
> I thought mdadm didn't us the /etc/raidtab file anymore
> 

You are correct. You just did not tell us what package and distribution you were using so I took a 
blind stab in the dark.

I use Debian and RaidTools here.

Regards,
Brad

Re: Deleting an raid device

[Holger Kiehl]

On Tue, 25 May 2004 me@heyjay.com wrote:

> Hi,
> 
> What are the proper steps for deleting all remnants of a previous raid
> install?
> 
> I've done:
> mdadm --stop /dev/md0
> mdadm --zero-superblock /dev/md0
> 
> But I still see it getting stopped on shutdown.
> 
Are the partitions system id still fd (raid autodetect)?

Holger

Re: Deleting an raid device

[me]

Yes they are

Jay
----- Original Message ----- 
From: "Holger Kiehl" <Holger.Kiehl@dwd.de>
To: <me@heyjay.com>
Cc: <linux-raid@vger.kernel.org>
Sent: Tuesday, May 25, 2004 4:17 PM
Subject: Re: Deleting an raid device


> On Tue, 25 May 2004 me@heyjay.com wrote:
> 
> > Hi,
> > 
> > What are the proper steps for deleting all remnants of a previous raid
> > install?
> > 
> > I've done:
> > mdadm --stop /dev/md0
> > mdadm --zero-superblock /dev/md0
> > 
> > But I still see it getting stopped on shutdown.
> > 
> Are the partitions system id still fd (raid autodetect)?
> 
> Holger
> 
> 

Re: Deleting an raid device

[Neil Brown]

On Tuesday May 25, me@heyjay.com wrote:
> Hi,
> 
> What are the proper steps for deleting all remnants of a previous raid
> install?
> 
> I've done:
> mdadm --stop /dev/md0
> mdadm --zero-superblock /dev/md0

I doubt that.  After stopping /dev/md0, trying to zero a superblock in
/dev/md0 would fail.
Superblocks don't live in the array, they live in the individual
component drives:

  mdadm --zero-superblock /dev/sd?c
or something.

But there is no harm having stray superblocks lying around.  
Make sure the partitions are not raid-auto-detect (as someone else
has mentioned I think) and make sure mdadm.conf doesn't mention the
arrays.

NeilBrown
 
> 
> But I still see it getting stopped on shutdown.
> 
> Thanks
> Jay
> 
> -
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