linux-kernel - Re: Failover root devices

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Message-ID: <55FB0923.30505@nod.at>
Date:	Thu, 17 Sep 2015 20:40:35 +0200
From:	Richard Weinberger <richard@....at>
To:	Austin S Hemmelgarn <ahferroin7@...il.com>,
	Richard Weinberger <richard.weinberger@...il.com>,
	Drew DeVault <sir@...wn.com>
Cc:	Ortwin Glück <odi@....ch>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Failover root devices

Am 17.09.2015 um 20:37 schrieb Austin S Hemmelgarn:
> On 2015-09-17 13:47, Richard Weinberger wrote:
>> On Thu, Sep 17, 2015 at 1:49 PM, Drew DeVault <sir@...wn.com> wrote:
>>> On 2015-09-17  1:40 PM, Ortwin Glück wrote:
>>>> You can do that completely in user space from an initramfs.
>>>
>>> Yep, I'm aware of that. I think it would still be useful for the kernel
>>> to support it. Bonus - if the kernel supports it, there's a standard way
>>> of doing it that would propegate down to the various initramfs designs
>>> of the distros without having me write patches against all of them.
>>> Right?
>>
>> I really don't see why we need this feature in-kernel as it can be
>> done perfectly fine
>> in userspace. Every non-trivial system needs an initramfs anyway these days.
>>
> Ha, not unless you're using systemd.  I have more than 2 dozen servers with complex setups that boot just fine without an initramfs.  Yes there is more setup done in initramfs
> these days, but it's still not actually needed in most cases except complicated storage setups.

I really don't count root=UUID... or root=LABEL... as complicated storage setup...

Thanks,
//richard
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