linux-kernel - Re: Raid auto-assembly on LDM?

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Message-ID: <18521.57487.410817.953075@notabene.brown>
Date:	Thu, 19 Jun 2008 14:29:03 +1000
From:	Neil Brown <neilb@...e.de>
To:	Jan De Luyck <ml_linuxkernel_20060528@...re.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Raid auto-assembly on LDM?

On Sunday June 15, ml_linuxkernel_20060528@...re.org wrote:
> Hello folks,
> 
> I'm trying something which is probably slightly crazy, but I can't get it to work.
> 
> What I'm trying is to get the linux kernel to auto-assembly my raid-1 sets, 
> which are based on volumes on two LDM disks.
> 
> The problem is that the kernel looks for partitiontypes of 0xfd, which I can't 
> set (or haven't found yet how to set) for LDM volumes. The assembly fails, and 
> the kernel panics.

Sorry, acronym failure:  What is LDM??

> 
> Another possibility would be to use an initrd/initramfs, but then I'm once again 
> stuck with a disk that is not in raid, and ergo a point of failure when the disk 
> might crash.

I don't understand your conclusion.
The initrd/initramfs is stored where ever your kernel is stored.  If
storing an initrd introduces a single point of failure, then storing
your Linux kernel will too.


Confused.

NeilBrown 


> 
> (The reason to use LDM is that this way I also can put the other OS on the disk 
> in mirror.)
> 
> Does anyone have any other ideas? I've searched the web, but noone really seems 
> inclined to do it this way...
> 
> Kind regards,
> 
> Jan
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