From owner-freebsd-fs@FreeBSD.ORG Fri May 18 01:34:21 2012 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 4E41B1065679 for ; Fri, 18 May 2012 01:34:21 +0000 (UTC) (envelope-from araujobsdport@gmail.com) Received: from mail-yx0-f182.google.com (mail-yx0-f182.google.com [209.85.213.182]) by mx1.freebsd.org (Postfix) with ESMTP id 01D318FC0C for ; Fri, 18 May 2012 01:34:20 +0000 (UTC) Received: by yenl8 with SMTP id l8so3059504yen.13 for ; Thu, 17 May 2012 18:34:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:reply-to:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=b2q/w5rdOy9+tHTo2DzXk7DPBYdWmQy0RPgNZjqYY1A=; b=Tcryfr6HV6oH1tLAWExRjw21R+23QeicZmTAOPhvSpX2CH4TJYobkWJTl6o/waprmt YTBx84knneciLUoaJfKyUsLWDxCiVZ84UUW4c88sY+fr2IlmF2BgZWFeEt88Wa4YTsiH KVe+05aTPqcnUYAoX8QUeRRBPNI1t96NFgX5NtH6oRmhB6EF8cW9FtnntADBGWGpgYfT YhQO4PzohEL7C3QOzl7ujQIf9ROBpvRAPtmmiAveT/Sa3WF/TUP26gN9RmdtnNQe0lhr aGwIq4XbHaC1gBQmGLfLADAJkMAaAvy03ftWjnd5NUPctciZHYlCMx1G6UvNjXWuSX4q T/3g== MIME-Version: 1.0 Received: by 10.50.42.129 with SMTP id o1mr7299353igl.72.1337304859838; Thu, 17 May 2012 18:34:19 -0700 (PDT) Received: by 10.231.31.196 with HTTP; Thu, 17 May 2012 18:34:19 -0700 (PDT) In-Reply-To: References: <20120515102206.GA53750@psconsult.nl> Date: Fri, 18 May 2012 09:34:19 +0800 Message-ID: From: Marcelo Araujo To: George Kontostanos Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-fs@freebsd.org Subject: Re: Mirror of Raidz for data reliability X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: araujo@FreeBSD.org List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 May 2012 01:34:21 -0000 2012/5/17 George Kontostanos > On Thu, May 17, 2012 at 1:52 PM, George Kontostanos > wrote: > > > Ok, after reading more carefully your first post I realized what you > are trying to do. > > 2 Machines, 2 different controllers. Yet interconnected. So, in a way > both machines would be able to see both controllers. > > This is very interesting but there are some implications. > > 1) Suppose you manage to create a mirror consisted by drives on those > different controllers. If you reboot machine #1 machine#2 might panic. > It is not like loosing a drive, here we are loosing a controller. > I don't know, why the machine#2 might panic. However, one controller will be passive and not active. > > 2) Both machines have to be online and the pool has to be mounted > readonly on the standby! You don't want both of them to accidentally > write at the same pool. > > Not no.You can use Devd to start some scripts to mount the FS in another machine or something like that. But I can't be focused only in this scenario, I believe there are much more application for it. > 3) HAST requires tcp to work therefore it is a no go. HAST also works > in the vdev level. Therefore the resources should not be online on the > standby server. > > Good luck, this is certainly very interesting. > Thanks dear George, any input and ideas is always welcome. Best Regards, -- Marcelo Araujo araujo@FreeBSD.org