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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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