From owner-freebsd-fs@FreeBSD.ORG Thu Nov 14 20:50:05 2013 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 994493EF for ; Thu, 14 Nov 2013 20:50:05 +0000 (UTC) Received: from out3-smtp.messagingengine.com (out3-smtp.messagingengine.com [66.111.4.27]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 6ED5A2C81 for ; Thu, 14 Nov 2013 20:50:04 +0000 (UTC) Received: from compute1.internal (compute1.nyi.mail.srv.osa [10.202.2.41]) by gateway1.nyi.mail.srv.osa (Postfix) with ESMTP id 5DBDD210F4 for ; Thu, 14 Nov 2013 15:49:58 -0500 (EST) Received: from web3 ([10.202.2.213]) by compute1.internal (MEProxy); Thu, 14 Nov 2013 15:49:58 -0500 DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d= messagingengine.com; h=message-id:from:to:mime-version :content-transfer-encoding:content-type:in-reply-to:references :subject:date; s=smtpout; bh=xlxw1JPQQdPs935bgXPs6OBb0aE=; b=bxp ykO+3CrDApudf3xKJnqgCDPksFHAqdNMTTl99kIVP30hWJCUUYGh2XiSVAhk+Kqw B+IJwbSyQ2lWnSn+mXsyzEN++NzD8BPbqx2TGUhBm5QZFrBPFoGUqU2KPNC36wGp vk3+4mdjjUpAe0z3mjkYnfz1XiEB9Phg5ywY5X8Y= Received: by web3.nyi.mail.srv.osa (Postfix, from userid 99) id 3E1DF1C1E14; Thu, 14 Nov 2013 15:49:58 -0500 (EST) Message-Id: <1384462198.13183.47596065.6F8E7BCD@webmail.messagingengine.com> X-Sasl-Enc: mTYzO+aTVnZsyzb2kaoa7AKU9/YD6hAySiKWS5x8af1A 1384462198 From: Mark Felder To: freebsd-fs@freebsd.org MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain X-Mailer: MessagingEngine.com Webmail Interface - ajax-d4893488 In-Reply-To: <3D3332FA-0ABF-4573-8E65-4E7FBB37100B@fisglobal.com> References: <20131114173423.GA21761@blazingdot.com> <59A9B68B-4134-4217-83F3-B99759174EFE@fisglobal.com> <5285148E.6020903@allanjude.com> <3D3332FA-0ABF-4573-8E65-4E7FBB37100B@fisglobal.com> Subject: Re: Defaults in 10.0 ZFS through bsdinstall Date: Thu, 14 Nov 2013 14:49:58 -0600 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: Thu, 14 Nov 2013 20:50:05 -0000 On Thu, Nov 14, 2013, at 12:35, Teske, Devin wrote: > > I have never heard a good argument for having atime on. The performance > penalty on ZFS is quite large, and it also makes your snapshots grow > constant. If you have a use for it, you can turn it on I guess. This > would be solved by having the dataset editor we're planning for 10.1 > POLA and POSIX, even though it was a bad decision to invent atime :-) We've never turned atime off before and it would be a huge surprise to me, so I'd avocate that we let the admins who know what they're doing turn it off. I know many Linux distros install with noatime and/or nodiratime, but I'm 99% sure tools don't create filesystems with atime flagged to be off by default (tune2fs -O noatime). We don't even do installs on UFS with atime disabled by default in fstab so why should we so suddenly change course for ZFS? -my 2c