From owner-freebsd-fs@FreeBSD.ORG  Wed Oct  3 13:34:58 2012
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 03EF7106564A
	for <freebsd-fs@FreeBSD.org>; Wed,  3 Oct 2012 13:34:58 +0000 (UTC)
	(envelope-from avg@FreeBSD.org)
Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140])
	by mx1.freebsd.org (Postfix) with ESMTP id 531DC8FC18
	for <freebsd-fs@FreeBSD.org>; Wed,  3 Oct 2012 13:34:56 +0000 (UTC)
Received: from odyssey.starpoint.kiev.ua (alpha-e.starpoint.kiev.ua
	[212.40.38.101])
	by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id QAA06424;
	Wed, 03 Oct 2012 16:34:53 +0300 (EEST)
	(envelope-from avg@FreeBSD.org)
Message-ID: <506C3EFC.2060602@FreeBSD.org>
Date: Wed, 03 Oct 2012 16:34:52 +0300
From: Andriy Gapon <avg@FreeBSD.org>
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64;
	rv:15.0) Gecko/20120911 Thunderbird/15.0.1
MIME-Version: 1.0
To: ram_chander250@yahoo.com
References: <CAMRGQbN=zwPktyZjfMoymA8PzrJqG=8mgUB2x5W4UVTMT3sdqA@mail.gmail.com>
In-Reply-To: <CAMRGQbN=zwPktyZjfMoymA8PzrJqG=8mgUB2x5W4UVTMT3sdqA@mail.gmail.com>
X-Enigmail-Version: 1.4.3
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: freebsd-fs@FreeBSD.org
Subject: Re: Zfs import issue
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 03 Oct 2012 13:34:58 -0000

on 03/10/2012 14:43 Ram Chander said the following:
> Hi,
> 
>  I am importing zfs snapshot to freebsd-9 from anther host running
> freebsd-9.  When the import happens, it locks the filesystem, "df" hangs
> and unable to use the filesystem. Once the import completes, the filesystem
> is back to normal and read/write works fine.  The same doesnt happen in
> Solaris/OpenIndiana.
> 
> # uname -an
> FreeBSD hostname 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Tue Jan  3 07:46:30
> UTC 2012     root@farrell.cse.buffalo.edu:/
> usr/obj/usr/src/sys/GENERIC  amd64
> 
> Zfs ver: 28
> 
> 
> Any inputs would be helpful. Is there any way to overcome this freeze ?

What if you add -n option to df?

-- 
Andriy Gapon