linux-kernel - Re: Linux mdadm superblock question.

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Message-ID: <alpine.DEB.2.00.1002132320320.5135@asgard.lang.hm>
Date:	Sat, 13 Feb 2010 23:21:52 -0800 (PST)
From:	david@...g.hm
To:	Michael Evans <mjevans1983@...il.com>
cc:	Volker Armin Hemmann <volkerarmin@...glemail.com>,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: Linux mdadm superblock question.

On Sat, 13 Feb 2010, Michael Evans wrote:

> On Sat, Feb 13, 2010 at 5:51 PM, Volker Armin Hemmann
> <volkerarmin@...glemail.com> wrote:
>>> 0.90 has a very bad problem, which is that it is hard to distinguish
>>> between a RAID partition at the end of volume and a full RAID device.
>>> This is because 0.90 doesn't actually tell you the start of the device.
>>>
>>> Then, of course, there are a lot of limitations on size, number of
>>> devices, and so on in 0.90.
>>
>> but it is the only format supporting autodetection.
>>
>> So - when will autodetection be introduced with 1.X? And if not, why not?
>>
>> All I found was 'autodetection might be troublesome' and nothing else.
>>  But dealing with initrds is troublesome too. Pure evil even.
>>
>> Gl?ck Auf,
>> Volker
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>
> I remember hearing that 1.x had /no/ plans for kernel level
> auto-detection ever.  That can be accomplished in early-userspace
> leaving the code in the kernel much less complex, and therefore far
> more reliable.
>
> In other words, 'auto-detection' for 1.x format devices is using an
> initrd/initramfs.

hmm, I've used 1.x formats without an initrd/initramfs (and without any 
conifg file on the server) and have had no problem with them being 
discovered. I haven't tried to use one for a boot/root device, so that may 
be the difference.

David Lang