From owner-freebsd-stable@FreeBSD.ORG Wed Oct 15 09:08:51 2008 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 785101065688 for ; Wed, 15 Oct 2008 09:08:51 +0000 (UTC) (envelope-from jdc@koitsu.dyndns.org) Received: from QMTA02.westchester.pa.mail.comcast.net (qmta02.westchester.pa.mail.comcast.net [76.96.62.24]) by mx1.freebsd.org (Postfix) with ESMTP id 206A28FC27 for ; Wed, 15 Oct 2008 09:08:50 +0000 (UTC) (envelope-from jdc@koitsu.dyndns.org) Received: from OMTA10.westchester.pa.mail.comcast.net ([76.96.62.28]) by QMTA02.westchester.pa.mail.comcast.net with comcast id Sx4e1a0050cZkys52x8BMz; Wed, 15 Oct 2008 09:08:11 +0000 Received: from koitsu.dyndns.org ([69.181.141.110]) by OMTA10.westchester.pa.mail.comcast.net with comcast id Sx8o1a0062P6wsM3Wx8pmv; Wed, 15 Oct 2008 09:08:49 +0000 X-Authority-Analysis: v=1.0 c=1 a=QycZ5dHgAAAA:8 a=_db6wvOsJWeSgzkmUIUA:9 a=k1rC0RfAaTgXml7PgN8bthREy1sA:4 a=EoioJ0NPDVgA:10 a=SV7veod9ZcQA:10 a=LY0hPdMaydYA:10 Received: by icarus.home.lan (Postfix, from userid 1000) id 8E3A4C9419; Wed, 15 Oct 2008 02:08:48 -0700 (PDT) Date: Wed, 15 Oct 2008 02:08:48 -0700 From: Jeremy Chadwick To: Peter Jeremy Message-ID: <20081015090848.GA72852@icarus.home.lan> References: <20081015082428.GE26536@server.vk2pj.dyndns.org> <20081015083538.GA72190@icarus.home.lan> <20081015085843.GF26536@server.vk2pj.dyndns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081015085843.GF26536@server.vk2pj.dyndns.org> User-Agent: Mutt/1.5.18 (2008-05-17) Cc: freebsd-stable@FreeBSD.org Subject: Re: System hanging during dump X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 15 Oct 2008 09:08:51 -0000 On Wed, Oct 15, 2008 at 07:58:43PM +1100, Peter Jeremy wrote: > On 2008-Oct-15 01:35:38 -0700, Jeremy Chadwick wrote: > >On Wed, Oct 15, 2008 at 07:24:28PM +1100, Peter Jeremy wrote: > >> Last night, I attempted a full, compressed backup of my 181GB /home > >> (on a PATA disk) to a remote system. The backup started at 2159 and > >> everything appeared normal until about 0040 when the system became > >> non-responsive and this lasted until the dump completed at 1033. This > >> is the first full backup of /home I've made for several years (due to > >> lack of space). > ... > >It's a known problem documented in my Wiki -- see "dump/restore". Note > >the part about UFS2 snapshot generation. I'm almost certain this is > >what you're describing. > > * UFS2 snapshot generation (mksnap_ffs, dump -L) takes too long; system is unusable during this time > In my case, snapshot creation took ~4 minutes. The system was > running normally for 2.6 hours after snapshot creation completed > before it froze. Did you read the References, including the one from myself? Snapshot generation in some cases took only minutes, but *removal* of the generated the snapshot took 1.5 hours or more, hanging the system until the removal was complete. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |