From owner-freebsd-stable@FreeBSD.ORG Fri Jan 7 02:24:01 2011 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 3F8B31065673 for ; Fri, 7 Jan 2011 02:24:01 +0000 (UTC) (envelope-from gpalmer@freebsd.org) Received: from noop.in-addr.com (mail.in-addr.com [IPv6:2001:470:8:162::1]) by mx1.freebsd.org (Postfix) with ESMTP id 0837D8FC13 for ; Fri, 7 Jan 2011 02:24:01 +0000 (UTC) Received: from gjp by noop.in-addr.com with local (Exim 4.72 (FreeBSD)) (envelope-from ) id 1Pb1zh-000GNY-CW; Thu, 06 Jan 2011 21:23:57 -0500 Date: Thu, 6 Jan 2011 21:23:57 -0500 From: Gary Palmer To: Jeremy Chadwick Message-ID: <20110107022357.GA61893@in-addr.com> References: <4D21E679.80002@my.gd> <84882169-0461-480F-8B4C-58E794BCC8E6@my.gd> <488AE93A-97B9-4F01-AD0A-0098E4B329C3@my.gd> <20110107014249.GA3719@icarus.home.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110107014249.GA3719@icarus.home.lan> X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: gpalmer@freebsd.org X-SA-Exim-Scanned: No (on noop.in-addr.com); SAEximRunCond expanded to false Cc: Chris Forgeron , "freebsd-stable@freebsd.org" , Artem Belevich , Jean-Yves Avenard Subject: Re: ZFS - moving from a zraid1 to zraid2 pool with 1.5tb disks 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: Fri, 07 Jan 2011 02:24:01 -0000 On Thu, Jan 06, 2011 at 05:42:49PM -0800, Jeremy Chadwick wrote: > On Fri, Jan 07, 2011 at 12:29:17PM +1100, Jean-Yves Avenard wrote: > > On 6 January 2011 22:26, Chris Forgeron wrote: > > > You know, these days I'm not as happy with SSD's for ZIL. I may blog about some of the speed results I've been getting over the last 6mo-1yr that I've been running them with ZFS. I think people should be using hardware RAM drives. You can get old Gigabyte i-RAM drives with 4 gig of memory for the cost of a 60 gig SSD, and it will trounce the SSD for speed. > > > > > > I'd put your SSD to L2ARC (cache). > > > > Where do you find those though. > > > > I've looked and looked and all references I could find was that > > battery-powered RAM card that Sun used in their test setup, but it's > > not publicly available.. > > DDRdrive: > http://www.ddrdrive.com/ > http://www.engadget.com/2009/05/05/ddrdrives-ram-based-ssd-is-snappy-costly/ > > ACard ANS-9010: > http://techreport.com/articles.x/16255 There is also https://www.hyperossystems.co.uk/07042003/hardware.htm which I believe is a rebadged ACard drive. They should be SATA-300, but the test results I saw were not that impressive to be honest. I think whatever FPGA they use for the SATA interface and DRAM controller is either underpowered or the gate layout needs work. Regards, Gary