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Date: Sat, 12 Mar 2011 12:11:45 -0800
From: "Jason C. Wells" <jcw@speakeasy.net>
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To: Chris Brennan <xaero@xaerolimit.net>
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Cc: John Levine <johnl@iecc.com>, freebsd-questions@freebsd.org,
	Robert <traveling08@cox.net>
Subject: Re: Unable to umount
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On 03/12/11 09:51, Chris Brennan wrote:
> 'umount -f' is dangerous, while it worked in your case, truly, make 
> sure you
> don't have any open files in the future, just to ensure no loss of files or
> filesytem corruption
Run sync before umount -f to flush write caches.

Later,
Jason