From owner-freebsd-stable@FreeBSD.ORG Tue Jan 19 18:57:26 2010 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 2C5641065670 for ; Tue, 19 Jan 2010 18:57:26 +0000 (UTC) (envelope-from lehmann@ans-netz.de) Received: from avocado.salatschuessel.net (avocado.salatschuessel.net [78.111.72.186]) by mx1.freebsd.org (Postfix) with SMTP id 5E6968FC16 for ; Tue, 19 Jan 2010 18:57:24 +0000 (UTC) Received: (qmail 48709 invoked by uid 89); 19 Jan 2010 18:57:22 -0000 Received: from unknown (HELO kartoffel.salatschuessel.net) (78.111.72.187) by avocado.salatschuessel.net with SMTP; 19 Jan 2010 18:57:22 -0000 Date: Tue, 19 Jan 2010 19:57:22 +0100 From: Oliver Lehmann To: Jeremy Chadwick Message-Id: <20100119195722.ee6e799b.lehmann@ans-netz.de> In-Reply-To: <20100119112449.GA73052@icarus.home.lan> References: <4B54C100.9080906@mail.zedat.fu-berlin.de> <4B54C5EE.5070305@pp.dyndns.biz> <201001191250.23625.doconnor@gsoft.com.au> <7346c5c61001181841j3653a7c3m32bc033c8c146a92@mail.gmail.com> <4B557B5A.8040902@pp.dyndns.biz> <20100119095736.GA71824@icarus.home.lan> <20100119110724.ec01a3ed.gerrit@pmp.uni-hannover.de> <20100119112449.GA73052@icarus.home.lan> X-Mailer: Sylpheed 2.7.1 (GTK+ 2.18.5; amd64-portbld-freebsd8.0) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: freebsd-stable@freebsd.org Subject: Re: immense delayed write to file system (ZFS and UFS2), performance issues 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: Tue, 19 Jan 2010 18:57:26 -0000 Hi, it seems that I'm not experiencing this at all... Jeremy Chadwick wrote: > WD10EACS - WD Caviar Green, 1TB, 16MB, variable rpm have one (external HDD, "always" powered on) Model = WDC WD10EAVS-00D7B1 Firmware Version = 01.01A01 Power_On_Hours 5757 Power_Cycle_Count 75 Load_Cycle_Count 127 > WD10EADS - WD Caviar Green, 1TB, 32MB, variable rpm have four, got them in Sep/09. one is RMAed right now because it had defective sectors in Dec/09 (surprisingly the first WDC I encountered problems so far). All four are used as a RAID-5 configured with my 3ware 9500-4LP. I don't know if the controller requests data from the drives in a very short period of time. I'm MRTGing some SMART attributes which should at least query the drive every minute. The ata idle feature is not supported at all trough the 3ware controllers. For the remaining 3 drives: Model = WDC WD10EADS-00L5B1 Firmware Version = 01.01A01 Power_On_Hours 2538 Power_Cycle_Count 140 Load_Cycle_Count 141 Power_On_Hours 2526 Power_Cycle_Count 133 Load_Cycle_Count 134 Power_On_Hours 2490 Power_Cycle_Count 126 Load_Cycle_Count 128 So - I'm not experiencing this problem at all but I "feel" that the drives are reacting more slowly than my previous WD2500KS-00MJB0 are. changing a directory and then typing ls takes some time until the result is displayed... I can live with that but it doesn't feel "good" And - it is not really something I would call "fast" - but it saves power :) The 3ware RAID-5 over 4 disks (using the EAVS from above as replacement right now until WDC sends a new drive back): Version 1.96 ------Sequential Output------ --Sequential Input- --Random- Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP nudel.salatschue 6G 89 99 76321 38 29285 21 249 99 111225 33 201.7 13 Latency 106ms 247ms 1155ms 63744us 145ms 382ms Version 1.96 ------Sequential Create------ --------Random Create-------- nudel.salatschuesse -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 571 6 +++++ +++ 1095 8 617 6 +++++ +++ 611 5 Latency 523ms 61us 125ms 103ms 87us 159ms -- Oliver Lehmann http://www.pofo.de/ http://wishlist.ans-netz.de/