From owner-freebsd-stable@FreeBSD.ORG Tue Mar 5 05:05:57 2013 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 636EA7C for ; Tue, 5 Mar 2013 05:05:57 +0000 (UTC) (envelope-from mauzo@anubis.morrow.me.uk) Received: from isis.morrow.me.uk (isis.morrow.me.uk [204.109.63.142]) by mx1.freebsd.org (Postfix) with ESMTP id 42457F7C for ; Tue, 5 Mar 2013 05:05:56 +0000 (UTC) Received: from anubis.morrow.me.uk (host86-177-98-144.range86-177.btcentralplus.com [86.177.98.144]) (Authenticated sender: mauzo) by isis.morrow.me.uk (Postfix) with ESMTPSA id 52167450D5 for ; Tue, 5 Mar 2013 05:05:49 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.7.4 isis.morrow.me.uk 52167450D5 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=morrow.me.uk; s=dkim201101; t=1362459949; bh=zTxULzH7AnUObu/hT2FGwKswOn2+suFODX6YEZ/Iqp0=; h=Date:From:To:Subject:References:In-Reply-To; b=1FOHP8GCxLwB1bGQQ2+FV7jgfgPijKoTBITUvgk7H8qr8XU3giFGF4schd0YwzAEv KLkuk3hu5dHITrY5SJqdzpexWRbhrbfpR/adpqhaA6Ae60uCYGKPUxE1rNnMN9imBI ejIBf1+NHapZIKdfHKWrcGb2D5h4bHVHmu5HS8hk= X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.97.6 at isis.morrow.me.uk Received: by anubis.morrow.me.uk (Postfix, from userid 5001) id 15CAD932B; Tue, 5 Mar 2013 05:05:47 +0000 (GMT) Date: Tue, 5 Mar 2013 05:05:47 +0000 From: Ben Morrow To: freebsd-stable@freebsd.org Subject: Re: ZFS "stalls" -- and maybe we should be talking about defaults? Message-ID: <20130305050539.GA52821@anubis.morrow.me.uk> References: <513524B2.6020600@denninger.net> <89680320E0FA4C0A99D522EA2037CE6E@multiplay.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <51355CFE.7080405@denninger.net> X-Newsgroups: gmane.os.freebsd.stable Organization: morrow.me.uk User-Agent: Mutt/1.5.21 (2010-09-15) X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Mar 2013 05:05:57 -0000 Quoth Karl Denninger : > > Note that the machine is not booting from ZFS -- it is booting from and > has its swap on a UFS 2-drive mirror (handled by the disk adapter; looks > like a single "da0" drive to the OS) and that drive stalls as well when > it freezes. It's definitely a kernel thing when it happens as the OS > would otherwise not have locked (just I/O to the user partitions) -- but > it does. Is it still the case that mixing UFS and ZFS can cause problems, or were they all fixed? I remember a while ago (before the arc usage monitoring code was added) there were a number of reports of serious probles running an rsync from UFS to ZFS. If you can it might be worth trying your scratch machine booting from ZFS. Probably the best way is to leave your swap partition where it is (IMHO it's not worth trying to swap onto a zvol) and convert the UFS partition into a separate zpool to boot from. You will also need to replace the boot blocks; assuming you're using GPT you can do this with gpart bootcode -p /boot/gptzfsboot -i . Ben