From owner-freebsd-fs@FreeBSD.ORG Wed Jan 9 09:45:55 2013 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id 2E4F7CD1 for ; Wed, 9 Jan 2013 09:45:55 +0000 (UTC) (envelope-from daniel@digsys.bg) Received: from smtp-sofia.digsys.bg (smtp-sofia.digsys.bg [193.68.3.230]) by mx1.freebsd.org (Postfix) with ESMTP id 9FF2E117 for ; Wed, 9 Jan 2013 09:45:53 +0000 (UTC) Received: from dcave.digsys.bg (dcave.digsys.bg [192.92.129.5]) (authenticated bits=0) by smtp-sofia.digsys.bg (8.14.5/8.14.5) with ESMTP id r099jgiZ090854 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO) for ; Wed, 9 Jan 2013 11:45:42 +0200 (EET) (envelope-from daniel@digsys.bg) Message-ID: <50ED3C46.4040200@digsys.bg> Date: Wed, 09 Jan 2013 11:45:42 +0200 From: Daniel Kalchev User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:10.0.11) Gecko/20121212 Thunderbird/10.0.11 MIME-Version: 1.0 To: freebsd-fs@freebsd.org Subject: Re: rc.d script for memory based zfs intent log References: <20130109023327.GA1888@FreeBSD.org> <20130109.115240.1198411557684741197.hrs@allbsd.org> <20130109031834.GA14386@FreeBSD.org> In-Reply-To: <20130109031834.GA14386@FreeBSD.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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: Wed, 09 Jan 2013 09:45:55 -0000 On 09.01.13 05:18, John wrote: > ----- Hiroki Sato's Original Message ----- >> Why is simply setting sync=disabled to the ZFS dataset not enough? > As you refer to, my understanding is that sync=disabled is at the dataset > layer. The zil approach is at the zpool layer - sync=disabled would be > nice at the zpool layer. A per-filesytem approach is better, because it lets you have huge zpool (the whole idea of ZFS) with only part of it being exported via NFS. You will also not risk data loss for the rest of the zpool. Daniel