linux-kernel - Re: Linux mdadm superblock question.

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Message-ID: <20100217183703.GA15446@emergent.ellipticsemi.com>
Date:	Wed, 17 Feb 2010 13:37:03 -0500
From:	Nick Bowler <nbowler@...iptictech.com>
To:	Volker Armin Hemmann <volkerarmin@...glemail.com>
Cc:	david@...g.hm, Kyle Moffett <kyle@...fetthome.net>,
	Rudy Zijlstra <rudy@...mpydevil.homelinux.org>,
	Neil Brown <neilb@...e.de>,
	"Mr. James W. Laferriere" <babydr@...y-dragons.com>,
	Bill Davidsen <davidsen@....com>,
	Michael Evans <mjevans1983@...il.com>,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: Linux mdadm superblock question.

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@...g.hm 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.

-- 
Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)
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