From owner-freebsd-fs@FreeBSD.ORG Wed Nov 20 23:02:19 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 D8D73BDD for ; Wed, 20 Nov 2013 23:02:19 +0000 (UTC) Received: from mail-pa0-x234.google.com (mail-pa0-x234.google.com [IPv6:2607:f8b0:400e:c03::234]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id B157A2FEB for ; Wed, 20 Nov 2013 23:02:19 +0000 (UTC) Received: by mail-pa0-f52.google.com with SMTP id ld10so6035695pab.25 for ; Wed, 20 Nov 2013 15:02:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=delphix.com; s=google; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=7aAdkkl5PneBRqGECuIyl5M+EyDa3RFZ07rcqJwbG9g=; b=PnuIBqAMeJNg2kX0zOXkHyw6K+YM0jEry3ImhFFQoFr9YDysj6u7utnaHJWUSPA23G yDSQFRbtvHVtLW+lIhH1qohFeTZFB1y+r3ahfpdg+5iTPe32k9EZVKDYMqSi3eEF/Oek E7eSrBK+WIsAZDlng9bVHFeSr+9BHKjefbzcM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=7aAdkkl5PneBRqGECuIyl5M+EyDa3RFZ07rcqJwbG9g=; b=IOaIlb6rKkj5UTytso/h48IIulB2423QSwvDZI5OWKj8yuytrVnWMOvQYheGPfpyxG LAeDWofGdP1tqmlWNKpqDUl+w26fcQ6PdOTLj6KCb9yhGgp6R5zeu0/mZQ8CzLGhkN7k Wx7vOXQ62EuaDL+HYKERlr75+PaBxnKN6uaS6oEZDDtu5/hralHVHSYOBpOH1/8gjqeG 0SiI3HD44liM6i+a/vA2vRNJbF1i3J6LuZ70RNReRSpZr2HmgKLMddQ0MmZAeKm9r01Y ROvHfmprl9ocyVIhMNL+Zi/M5VAqu9Ud4NLH6+T2MmpGGDhniyEB7RtvGuUsRjh/NK40 xluw== X-Gm-Message-State: ALoCoQlWClUsuonNDReXSWtQtm4kHzp+EYCxBfCe10eF5a/i/xw/JX9JhPj6fCTnnBM4n7zQcfws MIME-Version: 1.0 X-Received: by 10.68.178.68 with SMTP id cw4mr3100475pbc.15.1384988539228; Wed, 20 Nov 2013 15:02:19 -0800 (PST) Received: by 10.70.75.234 with HTTP; Wed, 20 Nov 2013 15:02:19 -0800 (PST) In-Reply-To: <20131114173423.GA21761@blazingdot.com> References: <20131114173423.GA21761@blazingdot.com> Date: Wed, 20 Nov 2013 15:02:19 -0800 Message-ID: Subject: Re: Defaults in 10.0 ZFS through bsdinstall From: Matthew Ahrens To: Marcus Reid Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.16 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: Wed, 20 Nov 2013 23:02:20 -0000 On Thu, Nov 14, 2013 at 9:34 AM, Marcus Reid wrote: > Hi, > > I noticed a couple of things with the ZFS defaults that result from > using the new installer in 10.0-BETA3. > > One, atime is turned off everywhere by default. There was a thread on > this list on June 8 with a subject of 'Changing the default for ZFS > atime to off?', and from what I can tell the idea of turning off atime > by default was not a popular one. > > It would be a pity if people compared ZFS on FreeBSD vs UFS on FreeBSD (using the installer's defaults) and came to the conclusion that "Mail programs don't work on ZFS on FreeBSD, use UFS instead." I think it's well known that there are performance differences between ZFS and UFS, depending on your workload. If you choose defaults that cause there to be correctness differences, that could be detrimental. --matt