From owner-freebsd-fs@FreeBSD.ORG Tue Nov 26 01:50:29 2013 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 0CA1BC2E for ; Tue, 26 Nov 2013 01:50:29 +0000 (UTC) Received: from mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 9900D28B6 for ; Tue, 26 Nov 2013 01:50:27 +0000 (UTC) Received: from r2d2 ([82.69.141.170]) by mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) (MDaemon PRO v10.0.4) with ESMTP id md50006828948.msg for ; Tue, 26 Nov 2013 01:50:24 +0000 X-Spam-Processed: mail1.multiplay.co.uk, Tue, 26 Nov 2013 01:50:24 +0000 (not processed: message from valid local sender) X-MDDKIM-Result: neutral (mail1.multiplay.co.uk) X-MDRemoteIP: 82.69.141.170 X-Return-Path: prvs=1042f5e7dd=killing@multiplay.co.uk X-Envelope-From: killing@multiplay.co.uk X-MDaemon-Deliver-To: freebsd-fs@freebsd.org Message-ID: From: "Steven Hartland" To: "Warren Block" , "Eric Browning" References: <2103733116.16923158.1384866769683.JavaMail.root@uoguelph.ca> <9F76D61C-EFEB-44B3-9717-D0795789832D@gmail.com> <5969250F-0987-4304-BB95-52C7BAE8D84D@gmail.com> <18391B9C-2FC4-427B-A4B6-1739B3C17498@gmail.com> Subject: Re: Performance difference between UFS and ZFS with NFS Date: Tue, 26 Nov 2013 01:50:15 -0000 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 Cc: FreeBSD FS X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.16 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 Nov 2013 01:50:29 -0000 ----- Original Message ----- From: "Warren Block" > On Mon, 25 Nov 2013, Eric Browning wrote: > >> I've tried to 4K align these SSDs with gnop but they are currently ashift >> 9. > > Those are two different things. Alignment is controlled by partition > starting block and size. Both should be integer multiples of 4K. > > Using gnop to force ashift=12 just makes sure ZFS is using 4K blocks, it > does not force alignment. stable/10 and current/11 have dynamic ashift support. It still requires either the disk report 4k sectors or a cam quirk. So if you believe your disk is 4k but its not reporting as such let us know. Regards Steve ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.