From owner-freebsd-stable@FreeBSD.ORG Fri Oct 29 09:43:03 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 3C0D4106566C for ; Fri, 29 Oct 2010 09:43:03 +0000 (UTC) (envelope-from serguey-grigoriev@yandex.ru) Received: from forward2.mail.yandex.net (forward2.mail.yandex.net [77.88.46.7]) by mx1.freebsd.org (Postfix) with ESMTP id DCCCA8FC0C for ; Fri, 29 Oct 2010 09:43:02 +0000 (UTC) Received: from web73.yandex.ru (web73.yandex.ru [77.88.47.198]) by forward2.mail.yandex.net (Yandex) with ESMTP id 0126238A8F23; Fri, 29 Oct 2010 13:43:00 +0400 (MSD) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1288345381; bh=Wf/1gxq/RytDa64KfoKotwZZSmOhrWufc8Clgi9BvxM=; h=From:To:Cc:In-Reply-To:References:Subject:MIME-Version:Message-Id: Date:Content-Transfer-Encoding:Content-Type; b=L36wZKSF+V3PVZVzWgCJzb8wy+CYc1EylvLI8G2EaBcK54Rko6S7sMlp09bEzbOVT ehRJa3kELffy7VwROCgjTmsqcQgbsUEYZa1+0wT0+mO7WqTutVerrM4eF/dxyWFQpH 3XKW5nHJTMQO8wCt7sHxyshQzQ/ZDh9SDXRQzxc4= Received: from localhost (localhost.localdomain [127.0.0.1]) by web73.yandex.ru (Yandex) with ESMTP id EBAE91DF0041; Fri, 29 Oct 2010 13:43:00 +0400 (MSD) X-Yandex-Spam: 0 X-Yandex-Front: web73.yandex.ru X-Yandex-TimeMark: 1288345380 Received: from netman.spbcity.net (netman.spbcity.net [77.244.18.5]) by mail.yandex.ru with HTTP; Fri, 29 Oct 2010 13:43:00 +0400 From: S.N.Grigoriev To: jhell In-Reply-To: <4CCA3C11.4000609@DataIX.net> References: <398231288212690@web127.yandex.ru> <7FF9CDFF-3FA0-45EA-85F5-A236AEFC03C7@lassitu.de> <313981288251001@web49.yandex.ru> <4CCA3C11.4000609@DataIX.net> MIME-Version: 1.0 Message-Id: <257661288345380@web73.yandex.ru> Date: Fri, 29 Oct 2010 13:43:00 +0400 X-Mailer: Yamail [ http://yandex.ru ] 5.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain Cc: freebsd-stable@freebsd.org Subject: Re: ZFS write speed 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: Fri, 29 Oct 2010 09:43:03 -0000 29.10.10, 07:14, "jhell" : > On 10/28/2010 03:30, S.N.Grigoriev wrote: > > > > > > 28.10.10, 01:54, "Stefan Bethke" : > > > >> Am 27.10.2010 um 22:51 schrieb S.N.Grigoriev: > >> > >> > Hi list, > >> > > >> > I've got very low write speed using ZFS on a SATA disk. > >> > My HDD configuration is: > >> > ad4: 70911MB at ata2-master UDMA100 SATA 3Gb/s > >> > ad6: 78532MB at ata3-master UDMA100 SATA 1.5Gb/s > >> > ad8: 1430799MB at ata4-master UDMA100 SATA 3Gb/s > >> > >> The EARS has 4k sectors, if I'm not mistaken. I don't recall the eventual > >> outcome, but there was a long thread on stable or hackers on how to ensure > >> proper alignment and (minimun) 4k-sized writes to make sure the disk doesn't > >> have to do a read-modify-write cycle, so try and search the archives. > > Though this might play a small part in your write performance with the > EARS drives, this issue has more to do with the stat() calls and the ACL > involvement with ZFS. This was sort of solved in 8.1-STABLE and from 3 > cases that I know about and 1 being my own... write/read speeds have > doubled from what can be seen to an effect of 8.1-RELEASE. > > You may want to either upgrade to stable/8 or use one of the snapshots > from here: > > ftp://ftp.freebsd.org/pub/FreeBSD/snapshots/201010/ > thank you. I'll be experimenting with STABLE next week. -- Regards, S.Grigoriev.