Re: Failover root devices

[Austin S Hemmelgarn]

On 2015-09-17 14:40, Richard Weinberger wrote:

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 <s...@cmpwn.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

That's not what I mean, I mean stuff like /usr and /var on separate filesystems, in a couple of cases self-assembling MD arrays, and in a couple of cases ATAoE or iSCSI backed root filesystems on hardware that doesn't natively support booting such devices.

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