From owner-freebsd-net@FreeBSD.ORG Fri Jun 3 00:57:03 2011 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8284F1065673 for ; Fri, 3 Jun 2011 00:57:03 +0000 (UTC) (envelope-from pvz@itassistans.se) Received: from zcs1.itassistans.net (zcs1.itassistans.net [212.112.191.37]) by mx1.freebsd.org (Postfix) with ESMTP id 1A9FC8FC15 for ; Fri, 3 Jun 2011 00:57:02 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by zcs1.itassistans.net (Postfix) with ESMTP id B13A2C0230; Fri, 3 Jun 2011 02:37:54 +0200 (CEST) X-Virus-Scanned: amavisd-new at zcs1.itassistans.net Received: from zcs1.itassistans.net ([127.0.0.1]) by localhost (zcs1.itassistans.net [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5VrDGMbPKEDU; Fri, 3 Jun 2011 02:37:54 +0200 (CEST) Received: from [192.168.1.239] (c213-89-160-61.bredband.comhem.se [213.89.160.61]) by zcs1.itassistans.net (Postfix) with ESMTPSA id 04859C01FC; Fri, 3 Jun 2011 02:37:54 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1084) From: Per von Zweigbergk In-Reply-To: <20110603001036.5ad0ff8d@davenulle.org> Date: Fri, 3 Jun 2011 02:37:53 +0200 Message-Id: <2E31CF74-416A-4310-9102-FD0C86275D0E@itassistans.se> References: <20110602203940.GA80549@slowblink.com> <20110603001036.5ad0ff8d@davenulle.org> To: Patrick Lamaiziere X-Mailer: Apple Mail (2.1084) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-fs@freebsd.org, freebsd-net@freebsd.org, John Subject: Re: Production use of carp? X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Jun 2011 00:57:03 -0000 3 jun 2011 kl. 00.10 skrev Patrick Lamaiziere: > You may want to implement your own control because if the two hosts > cannot communicate, you will have two masters. This can happen if the > links on the both hosts are up, but none packet are forwarded (ie the > switch connecting the two boxes is broken in some way). As a general thought that might be interesting when you're building your = HA solution: One less-documented feature of VMware ESXi is that it checks whether = it's isolated from the network by pinging the gateway on the management = network. This is how ESXi trys to avoid having a split-brain condition - by = making sure that it only considers itself to be the master if it can = reach the gateway, but cannot reach any other servers. You might = implement gating in a similar way to avoid a split-brain condition in = your HA solution.=