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From: "Steven Hartland" <smh@freebsd.org>
Subject: Re: kern/177985: [zfs] disk usage problem when copying from one zfs
 dataset to another on the same pool using mv command
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The following reply was made to PR kern/177985; it has been noted by GNATS.

From: "Steven Hartland" <smh@freebsd.org>
To: <bug-followup@freebsd.org>,
	<sybersnake@gmail.com>
Cc:  
Subject: Re: kern/177985: [zfs] disk usage problem when copying from one zfs dataset to another on the same pool using mv command
Date: Sat, 20 Apr 2013 18:30:26 +0100

 Deletes / frees are lower priority than standard writes / reads so its
 quite possible in the scenario you describe that you could run out of space.
 
 Could you please confirm the exact behaviour by allow mv to process a
 number of files, before suspending and seeing if the free space is correct
 for the current progress after waiting for the pool to sync all outstanding
 requests.
 
     Regards
     Steve