Re: Linux mdadm superblock question.
From: david
Date: Wed Feb 17 2010 - 13:41:52 EST
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 , david@xxxxxxx 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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