From owner-freebsd-fs@FreeBSD.ORG Sat Jun 8 19:27:56 2013 Return-Path: Delivered-To: fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id F1F0AEC0; Sat, 8 Jun 2013 19:27:55 +0000 (UTC) (envelope-from Devin.Teske@fisglobal.com) Received: from mx1.fisglobal.com (mx1.fisglobal.com [199.200.24.190]) by mx1.freebsd.org (Postfix) with ESMTP id C27B21110; Sat, 8 Jun 2013 19:27:55 +0000 (UTC) Received: from smtp.fisglobal.com ([10.132.206.16]) by ltcfislmsgpa04.fnfis.com (8.14.5/8.14.5) with ESMTP id r58JRslQ001982 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT); Sat, 8 Jun 2013 14:27:54 -0500 Received: from LTCFISWMSGMB21.FNFIS.com ([10.132.99.23]) by LTCFISWMSGHT05.FNFIS.com ([10.132.206.16]) with mapi id 14.02.0309.002; Sat, 8 Jun 2013 14:27:54 -0500 From: "Teske, Devin" To: Steven Hartland Subject: Re: Changing the default for ZFS atime to off? Thread-Topic: Changing the default for ZFS atime to off? Thread-Index: AQHOZHmRVUWybNoNfkOgXzEPFJrPFJksh2iA Date: Sat, 8 Jun 2013 19:27:54 +0000 Message-ID: <13CA24D6AB415D428143D44749F57D7201F78158@ltcfiswmsgmb21> References: <16FEF774EE8E4100AD2CAEC65276A49D@multiplay.co.uk> In-Reply-To: <16FEF774EE8E4100AD2CAEC65276A49D@multiplay.co.uk> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.132.253.126] Content-Type: text/plain; charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.10.8626, 1.0.431, 0.0.0000 definitions=2013-06-08_06:2013-06-08,2013-06-08,1970-01-01 signatures=0 Cc: Devin Teske , "fs@freebsd.org" X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 08 Jun 2013 19:27:56 -0000 On Jun 8, 2013, at 11:54 AM, Steven Hartland wrote: > One of the first changes we make here when installing machines > here to changing atime=3Doff on all ZFS pool roots. >=20 > I know there are a few apps which can rely on atime updates > such as qmail and possibly postfix, but those seem like special > cases for which admins should enable atime instead of the other > way round. >=20 > This is going to of particular interest for flash based storage > which should avoid unnessacary writes to reduce wear, but it will > also help improve performance in general. >=20 > So what do people think is it worth considering changing the > default from atime=3Don to atime=3Doff moving forward? >=20 +1 we turn it off on every ZFS filesystem (but we also don't use ZFS for ro= ot) > If so what about UFS, same change? >=20 We leave atime enabled for UFS root partition, /usr partition, /tmp partiti= on, and /var But if/when we do use UFS for non-system partitions, we turn it off there t= oo. --=20 Devin _____________ The information contained in this message is proprietary and/or confidentia= l. If you are not the intended recipient, please: (i) delete the message an= d all copies; (ii) do not disclose, distribute or use the message in any ma= nner; and (iii) notify the sender immediately. In addition, please be aware= that any message addressed to our domain is subject to archiving and revie= w by persons other than the intended recipient. Thank you.