From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gandalf Corvotempesta Subject: Re: questions on networks and hardware Date: Sun, 20 Jan 2013 23:43:45 +0100 Message-ID: References: <6C6B937F81BD480D8B439B27D504FE9C@inktank.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Return-path: Received: from mail-wi0-f179.google.com ([209.85.212.179]:38698 "EHLO mail-wi0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752515Ab3ATWnr convert rfc822-to-8bit (ORCPT ); Sun, 20 Jan 2013 17:43:47 -0500 Received: by mail-wi0-f179.google.com with SMTP id o1so4449373wic.12 for ; Sun, 20 Jan 2013 14:43:46 -0800 (PST) In-Reply-To: <6C6B937F81BD480D8B439B27D504FE9C@inktank.com> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Gregory Farnum Cc: John Nielsen , ceph-devel@vger.kernel.org 2013/1/20 Gregory Farnum : > This is a bit embarrassing, but if you're actually using two networks and the cluster network fails but the client network stays up, things behave pretty badly (the OSDs will keep insisting it's failed, while the monitor will insist it's still working). I believe there's a branch working on this problem, but I haven't been involved with it. > It's not necessary to have split networks though, no. Ok. > Does that answer your question? Absolutely, but usually cluster network is faster than client network and being forced to use two cluster network is very very expensive.