From owner-freebsd-hardware@FreeBSD.ORG Mon Apr 4 08:20:12 2011 Return-Path: Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D7026106567A; Mon, 4 Apr 2011 08:20:12 +0000 (UTC) (envelope-from mavbsd@gmail.com) Received: from mail-fx0-f54.google.com (mail-fx0-f54.google.com [209.85.161.54]) by mx1.freebsd.org (Postfix) with ESMTP id A7EA48FC15; Mon, 4 Apr 2011 08:20:02 +0000 (UTC) Received: by fxm11 with SMTP id 11so4930163fxm.13 for ; Mon, 04 Apr 2011 01:20:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:sender:message-id:date:from:user-agent :mime-version:to:cc:subject:references:in-reply-to:content-type :content-transfer-encoding; bh=l04cw0IYAr30RG3N6Lbtfri0ChwFma97eZ/DyBhNtHk=; b=uag/V9ocLCQfbwunsmfx3aWDhBlg1rsEnewFUR8BxloiLHWU+OoCN4spIFlntJX3m/ VY9Ug+LafDiseZitVyuTcsJ1YkHiSeQgMiUv+PyDnMHJShV+/z6mPW1u/30MWVaENUxQ D8bGV9ajyBDB0WbhUe3mvKv7VHWjpC2/nsIKs= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; b=qNTbfamgWaads06pFUzbtmFM27PwJ/SMLx3g1WfCiYL4LggStrlvTidaGOoDc5LmY2 esI/LvDoswNfL38WNMEs2Q9lOkN0nPr9gQRFJOz2C/M6vaHrMM/CKqDjzTXYMBzVjqj9 3XNu4cyxR1h16f9GZsL4NtfwsDHMj1SwUR3IM= Received: by 10.223.54.148 with SMTP id q20mr1266308fag.84.1301903326848; Mon, 04 Apr 2011 00:48:46 -0700 (PDT) Received: from mavbook.mavhome.dp.ua ([91.198.175.1]) by mx.google.com with ESMTPS id k5sm1587417faa.15.2011.04.04.00.48.45 (version=SSLv3 cipher=OTHER); Mon, 04 Apr 2011 00:48:46 -0700 (PDT) Sender: Alexander Motin Message-ID: <4D9977DC.5070001@FreeBSD.org> Date: Mon, 04 Apr 2011 10:48:44 +0300 From: Alexander Motin User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US; rv:1.9.2.15) Gecko/20110310 Thunderbird/3.1.9 MIME-Version: 1.0 To: lev@FreeBSD.org References: <22830765.20110404101040@serebryakov.spb.ru> In-Reply-To: <22830765.20110404101040@serebryakov.spb.ru> Content-Type: text/plain; charset=windows-1251; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-hardware@freebsd.org Subject: Re: Advanced disk format at WD20EARS: what should "camcontrol identify" show? X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Apr 2011 08:20:12 -0000 Hi. On 04.04.2011 09:10, Lev Serebryakov wrote: > I'm replacing old WD500AAKS HDDs in my (software) RAID5 with new > WD20EARS, which are advanced format. And speed is terrible. RAID5 > rebuilding shows about 8MiB/s (55MiB/s is typical speed for old AAKSes)... > > I'm affraid, that my HDD is in some strange mode with 512 byte > sectors emulation: > > ================ > blob# camcontrol identify /dev/ada5 > pass5: ATA-8 SATA 2.x device > pass5: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) > > protocol ATA/ATAPI-8 SATA 2.x > device model WDC WD20EARS-00MVWB0 > firmware revision 51.0AB51 > serial number WD-WMAZA2743249 > WWN 50014ee6ab72f596 > cylinders 16383 > heads 16 > sectors/track 63 > sector size logical 512, physical 512, offset 0 > LBA supported 268435455 sectors > LBA48 supported 3907029168 sectors > PIO supported PIO4 > DMA supported WDMA2 UDMA6 > ================ > > Should "camcontrol identify" shows "physical 4096" in "sector size"? > Some Alexander Motin's posts to mailing lists says "yes", but I can not find what > should I think (do) if it doesn't. Unluckily present 4K driver don't usually honor specification in part of reporting physical sector sizes. I haven't seen supporting ones myself actually. So I wouldn't trust those 512/512/0 numbers. > It is 8-STABLE (after 8.2-RELEASE) system. RAID stripes are 128KiB, > and RAID is built from whole drives (no partitions), so, write > requests should not be misaligned. At least first 4K WD disks had a jumper to add offset of 63 sectors. Make sure that you don't have one set. -- Alexander Motin