From owner-freebsd-stable@FreeBSD.ORG Tue Jun 2 13:45:57 2009 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 38B081065672 for ; Tue, 2 Jun 2009 13:45:57 +0000 (UTC) (envelope-from nvass9573@gmx.com) Received: from mail.gmx.com (unknown [213.165.64.42]) by mx1.freebsd.org (Postfix) with SMTP id 80F3F8FC1F for ; Tue, 2 Jun 2009 13:45:56 +0000 (UTC) (envelope-from nvass9573@gmx.com) Received: (qmail invoked by alias); 02 Jun 2009 13:45:54 -0000 Received: from unknown (EHLO [192.168.254.1]) [91.140.118.23] by mail.gmx.com (mp-eu001) with SMTP; 02 Jun 2009 15:45:54 +0200 X-Authenticated: #46156728 X-Provags-ID: V01U2FsdGVkX18wcr43mT0wYvY/rdxmztmRjY9i624k+ALGc2aU2E 6dplTUgCum9a5N Message-ID: <4A252CC5.1030900@gmx.com> Date: Tue, 02 Jun 2009 16:44:37 +0300 From: Nikos Vassiliadis User-Agent: Thunderbird 2.0.0.21 (Windows/20090302) MIME-Version: 1.0 To: sthaug@nethelp.no References: <200906021845.33739.doconnor@gsoft.com.au> <4A24FAF0.2020603@quip.cz> <20090602.123730.41694829.sthaug@nethelp.no> In-Reply-To: <20090602.123730.41694829.sthaug@nethelp.no> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-FuHaFi: 0.67 Cc: freebsd-stable@freebsd.org, 000.fbsd@quip.cz Subject: Re: ZFS NAS configuration question 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: Tue, 02 Jun 2009 13:45:57 -0000 sthaug@nethelp.no wrote: >> root filesystem is remounted read write only for some configuration >> changes, then remounted back to read only. > > Does this work reliably for you? I tried doing the remounting trick, > both for root and /usr, back in the 4.x time frame. And could never > get it to work - would always end up with inconsistent file systems. There were many fixes in this area lately. The case where a file system with softdeps would fail to update to read-only is fixed in -CURRENT and these changes are merged to -STABLE. It is believed to work correctly. http://lists.freebsd.org/pipermail/freebsd-stable/2008-October/046001.html Remounting with soft updates enabled used to be too fragile to be useful. Now it seems very solid. Nikos