linux-kernel - Re: Kernel 2.6.23.9 + mdadm 2.6.2-2 + Auto rebuild RAID1?

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Message-ID: <877ijrynb3.fsf@hades.wkstn.nix>
Date:	Fri, 07 Dec 2007 07:30:08 +0000
From:	Nix <nix@...eri.org.uk>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	Justin Piszcz <jpiszcz@...idpixels.com>,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	apiszcz@...arrain.com
Subject: Re: Kernel 2.6.23.9 + mdadm 2.6.2-2 + Auto rebuild RAID1?

On 6 Dec 2007, Jan Engelhardt verbalised:
> On Dec 5 2007 19:29, Nix wrote:
>>>
>>> On Dec 1 2007 06:19, Justin Piszcz wrote:
>>>
>>>> RAID1, 0.90.03 superblocks (in order to be compatible with LILO, if
>>>> you use 1.x superblocks with LILO you can't boot)
>>>
>>> Says who? (Don't use LILO ;-)
>>
>>Well, your kernels must be on a 0.90-superblocked RAID-0 or RAID-1
>>device. It can't handle booting off 1.x superblocks nor RAID-[56]
>>(not that I could really hope for the latter).
>
> If the superblock is at the end (which is the case for 0.90 and 1.0),
> then the offsets for a specific block on /dev/mdX match the ones for /dev/sda,
> so it should be "easy" to use lilo on 1.0 too, no?

Sure, but you may have to hack /sbin/lilo to convince it to create the
superblock there at all. It's likely to recognise that this is an md
device without a v0.90 superblock and refuse to continue. (But I haven't
tested it.)

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