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SubjectRe: Linux mdadm superblock question.
On Wed, 17 Feb 2010, Nick Bowler wrote:

> On 19:27 Wed 17 Feb , Volker Armin Hemmann wrote:
>> On Mittwoch 17 Februar 2010, Nick Bowler wrote:
>>> On 09:41 Wed 17 Feb , wrote:
>>>> for a distro that is trying to make one kernel image run on every
>>>> possible type of hardware features like initramfs (and udev, modeules,
>>>> etc) are wonderful.
>>>> however for people who run systems that are known ahead of time and
>>>> static (and who build their own kernels instead of just relying on the
>>>> distro default kernel), all of this is unnessesary complication, which
>>>> leaves more room for problems to creep in.
>>> Such people can easily construct an initramfs containing busybox and
>>> mdadm with a shell script hardcoded to mount their root fs and run
>>> switch_root. It's a ~10 minute jobbie that only needs to be done once.
>> and even better when you don't have to do that one time job at all.
> But people who are building their own kernels are already doing a
> (much harder, imo) one time job of configuring their kernels.
>> btw, what about additional delay?
> It takes about half a second for mdadm to assemble my root array, is
> that what you're referring to?
> I assume that kernel auto-assembly is no faster, although I've never
> used it. Regardless, half a second isn't very long to wait.

If you are aiming for a 5-second boot time it's 10% of your total boot
time. That's a lot for a feature that's not needed.

David Lang

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