From owner-freebsd-current@FreeBSD.ORG Fri Dec 18 10:25:16 2009 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2E5C41065692 for ; Fri, 18 Dec 2009 10:25:14 +0000 (UTC) (envelope-from alexz@visp.ru) Received: from mail.visp.ru (srv1.visp.ru [91.215.204.2]) by mx1.freebsd.org (Postfix) with ESMTP id 4014B8FC23 for ; Fri, 18 Dec 2009 10:25:13 +0000 (UTC) Received: from 91-215-205-255.static.visp.ru ([91.215.205.255] helo=zagrebin) by mail.visp.ru with esmtp (Exim 4.66 (FreeBSD)) (envelope-from ) id 1NLa1I-0005LQ-Im for freebsd-current@freebsd.org; Fri, 18 Dec 2009 13:25:12 +0300 From: "Alexander Zagrebin" To: References: <39309F560B98453EBB9AEA0F29D9D80E@vosz.local><4B2A341C.5000802@clearchain.com><6D3B0162A2134CAEA9F4DF5BC03707AA@vosz.local> <4C1C2598-4157-4B04-8DB8-C84F353AB8B8@nevada.net.nz> Date: Fri, 18 Dec 2009 13:25:12 +0300 Keywords: freebsd-current Message-ID: <2252F3A1382A46E9B31273F4CD30DE49@vosz.local> MIME-Version: 1.0 Content-Type: text/plain; charset="koi8-r" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 Thread-Index: Acp/wFFsnbLtQRcMTEiQaKLAiGD/fgADAOjQ X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5512 In-Reply-To: <4C1C2598-4157-4B04-8DB8-C84F353AB8B8@nevada.net.nz> Subject: RE: 8.0-RELEASE: disk IO temporarily hangs up (ZFS or ATA related problem) X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Dec 2009 10:25:16 -0000 > > May be a problem is in ata? WD15EADS is a "green" series of drives. > > The WD green drives have a feature called Time Limited Error > Recovery > where the disk can spend several minutes trying to read a bad > block etc. > > It plays havoc with RAID arrays which is why WD recommend you don't > use the green drives in arrays. They have more info about the > "feature" in the WD FAQ/knowledgebase I think this recommendation is related mostly to hardware raid controllers. Also, if to suppose the such drive errors, then "reallocated sectors count" in the SMART wouldn't be zero. But SMART data is ok. $ sudo smartctl -A /dev/ad6 | grep -e "^ID" -e "Reallocated_Sector_Ct" ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0 -- Alexander Zagrebin