From owner-freebsd-current@FreeBSD.ORG Mon Dec 28 16:41:46 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 4BF50106566C; Mon, 28 Dec 2009 16:41:46 +0000 (UTC) (envelope-from pieter@degoeje.nl) Received: from mx.utwente.nl (mx3.utsp.utwente.nl [130.89.2.14]) by mx1.freebsd.org (Postfix) with ESMTP id BD54D8FC08; Mon, 28 Dec 2009 16:41:45 +0000 (UTC) Received: from nox.student.utwente.nl (nox.student.utwente.nl [130.89.165.91]) by mx.utwente.nl (8.12.10/SuSE Linux 0.7) with ESMTP id nBSGfRHH001304; Mon, 28 Dec 2009 17:41:27 +0100 From: Pieter de Goeje To: freebsd-current@freebsd.org Date: Mon, 28 Dec 2009 17:41:26 +0100 User-Agent: KMail/1.9.10 References: <4B349ABF.2070800@FreeBSD.org> <4B389D60.7000005@quip.cz> <4B38A4DE.2040507@FreeBSD.org> In-Reply-To: <4B38A4DE.2040507@FreeBSD.org> MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Message-Id: <200912281741.27179.pieter@degoeje.nl> X-UTwente-MailScanner-Information: Scanned by MailScanner. Contact icts.servicedesk@utwente.nl for more information. X-UTwente-MailScanner: Found to be clean X-UTwente-MailScanner-From: pieter@degoeje.nl X-Spam-Status: No Cc: Alexander Motin , Miroslav Lachman <000.fbsd@quip.cz>, Thomas Backman , freebsd-arch@freebsd.org Subject: Re: File system blocks alignment 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: Mon, 28 Dec 2009 16:41:46 -0000 On Monday 28 December 2009 13:30:22 Alexander Motin wrote: > Miroslav Lachman wrote: > > Alexander Motin wrote: > >> Thomas Backman wrote: > >>> On Dec 25, 2009, at 11:58 AM, Alexander Motin wrote: > >> |>> Recently WD released first series of ATA disks with increased > >> > >> physical > >> > >>>> sector size. It makes writes not matching with 4K blocks inefficient > >>>> there. > >>> > >>> They don't expose this to the OS, though (not by default, anyway), > >>> but chop it up into 8 512-byte sectors for compatibility reasons. > >>> Just thought I'd point that out - I'm not even sure if you can get > >>> them to *not* do the compatibility thing and expose 4k-sized sectors. > >> > >> Latest ATA-8 specification allows drive to report both logical (512B) > >> and physical (4KB) sector sizes. ada driver able to fetch and report > >> that info to GEOM. If these drives not reporting it yet (are you really > >> sure?), it is only question of their firmware. > > > > There is an article about 4k sectors > > http://www.anandtech.com/storage/showdoc.aspx?i=3D3691 > > > > It is completely hidden to OS in first versions. > > Thanks for the link, but all I see there is "but at this point there=92s > no such tool". IMHO it doesn't meet it is not reported. > > We just need somebody with that drive to run on it `camcontrol identify` > from the fresh system and report what he sees. I've just ordered one of these disks. I expect it to arrive in a couple of= =20 days. Will let you know what it says when I have it :) =2D Pieter