linux-kernel - Re: Modular kernel (2.6.20) and software raid auto detection

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Date:	Fri, 16 Feb 2007 10:32:19 +1100
From:	Neil Brown <neilb@...e.de>
To:	Andrew Walrond <andrew@...rond.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Modular kernel (2.6.20) and software raid auto detection

On Thursday February 15, andrew@...rond.org wrote:
> 
> With my ide driver and the md stuff all built into the kernel, my software 
> raid drives and associated /dev/md? devices are detected and created by the 
> kernel.

Yep.

> 
> With the md stuff built in but the ide driver modular and loaded later by 
> udev, the drives are not detected.

No, they aren't.

> 
> So, I guessed that perhaps if I made the md stuff modular aswell and load it 
> _after_ loading the ide driver, this might kickstart the auto-detect stuff. 
> But it didn't :(

No, it wouldn't.

> 
> Is there a way to make auto-detection work without having the ide driver built 
> in?

Don't use in-kernel auto-detection.  Use mdadm to do the
auto-detection for you.

  mdadm --assemble --scan --homehost='<system>' --auto-update-homehost

might work providing your hostname has been set by the time it runs.

NeilBrown
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