Re: Mounting root...

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Date: Wed, 25 Aug 2004 22:18:27 +0200
To: John Baldwin <jhb@FreeBSD.org>

On Wed, Aug 25, 2004 at 09:33:56AM +0200, Pawel Jakub Dawidek wrote:
+> On Tue, Aug 24, 2004 at 09:43:40AM -0400, John Baldwin wrote:
+> +> The fact that a RAID can recover when a disk goes away and comes back is
+> +> already the "general solution" it seems. It works all the time, not just at
+> +> boot, so it seems to me like you are trying to solve a problem that is
+> +> already solved. I think at most you could maybe have a system wide delay
+> +> before that the user can tweak via a tunable (rather than a per-GEOM class
+> +> tunable like your mirror one) in order to optimize the boot code for these
+> +> rare cases but that is about it. I.e., if a user notices that one of the
+> +> disks always takes an extra second they can set the tunable to force the
+> +> kernel to wait 2 seconds before trying to mount root. Any such delay should
+> +> be centralized, however, and not per-class, since all the per-class delays
+> +> would end up being cumulative, so if MIRROR waits 2 seconds and STRIPE waits
+> +> 3 seconds then the entire process actually waits 5 seconds as opposed to
+> +> letting the user tweak a single centralized timeout.
+>
+> I second this, I'll prepare a patch then.

Ok, here is proposed patch:

        http://people.freebsd.org/~pjd/patches/root_mount.patch

-- 
Pawel Jakub Dawidek                       http://www.FreeBSD.org
pjd@FreeBSD.org                           http://garage.freebsd.pl
FreeBSD committer                         Am I Evil? Yes, I Am!

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