From owner-freebsd-current@FreeBSD.ORG  Tue Aug  2 17:56:57 2005
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Date: Tue, 2 Aug 2005 19:56:50 +0200
From: Wilko Bulte <wb@freebie.xs4all.nl>
To: Kevin Oberman <oberman@es.net>
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Cc: Colin King <ring_06@m202.net>, Scot Hetzel <swhetzel@gmail.com>,
	Justin Finkelstein <justin@redwiredesign.com>, freebsd-current@freebsd.org
Subject: Re: Hot-swap SATA and atacontrol
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On Tue, Aug 02, 2005 at 10:48:59AM -0700, Kevin Oberman wrote..
> > Date: Tue, 2 Aug 2005 18:00:45 +0200
> > From: Wilko Bulte <wb@freebie.xs4all.nl>
> > Sender: owner-freebsd-current@freebsd.org
> > 
> > On Tue, Aug 02, 2005 at 10:44:07AM -0500, Scot Hetzel wrote..
> > > On 8/2/05, Justin Finkelstein <justin@redwiredesign.com> wrote:
> > > > I might be being a little dense, but what do you mean by sync?
> > > > 
> > > before you unmount the drive, type:
> > > 
> > > sync
> > > sync
> > > sync
> > > 
> > > Then unmount the drive, and remove it.
> > 
> > Unmount does not return until the buffers have been synced anyway,
> > so this does not buy you anything.
> > 
> > The ancient form is more like:
> > 
> > sync;sync;sync;<halt button on your PDP/11 frontpanel>
> 
> Not really. The PDP-11 (and early VAX) invocation was:
> sync
> sync
> sync
> <Hit halt switch>
> 
> There was a real difference between that and sync;sync;sync. Either was
> usually effective, but the delay to enter actual separate commands was

Yes, I should have been more accurate here.

> required for real safety. (Unix file systems were really pretty unstable
> back then. fsck was the norm on many reboots, even if you THOUGHT that
> they had been safely dismounted.)

Yeah.  No clean bit either.

I had Ultrix-11 running on a 11/34 on dual RK05 once.  Now that is fun.. :)

-- 
Wilko Bulte				wilko@FreeBSD.org