From owner-freebsd-hackers@FreeBSD.ORG Wed Oct 1 12:40:21 2014 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 9EB6A25E for ; Wed, 1 Oct 2014 12:40:21 +0000 (UTC) Received: from mail.iXsystems.com (mail.ixsystems.com [12.229.62.4]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client CN "*.ixsystems.com", Issuer "Go Daddy Secure Certification Authority" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 83698E1D for ; Wed, 1 Oct 2014 12:40:21 +0000 (UTC) Received: from localhost (mail.ixsystems.com [10.2.55.1]) by mail.iXsystems.com (Postfix) with ESMTP id B99287FA59; Wed, 1 Oct 2014 05:40:20 -0700 (PDT) Received: from mail.iXsystems.com ([10.2.55.1]) by localhost (mail.ixsystems.com [10.2.55.1]) (maiad, port 10024) with ESMTP id 26186-06; Wed, 1 Oct 2014 05:40:20 -0700 (PDT) Received: from [10.8.0.38] (unknown [10.8.0.38]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.iXsystems.com (Postfix) with ESMTPSA id A96437FA56; Wed, 1 Oct 2014 05:40:19 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 8.0 \(1988\)) Subject: Re: cluster FS? From: Jordan Hubbard In-Reply-To: Date: Wed, 1 Oct 2014 15:40:16 +0300 Content-Transfer-Encoding: quoted-printable Message-Id: References: <201410010902.s9192Lhb084232@mech-as221.men.bris.ac.uk> <201E3A2E-B33D-4C63-AD81-8FFD5C2E0ED7@mail.turbofuzz.com> To: krad X-Mailer: Apple Mail (2.1988) Cc: freebsd-hackers@freebsd.org, mexas@bristol.ac.uk X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Oct 2014 12:40:21 -0000 > On Oct 1, 2014, at 2:03 PM, krad wrote: >=20 > These are my definitions, hopefully it makes some stuff a little = clearer Thanks for the exposition - if that doesn=E2=80=99t help Anton, I = don=E2=80=99t know what will. :-) To answer Anton=E2=80=99s previous question, he just needs to read the = PDF he cited a little more closely. HP has obviously provided some sort = of concurrent access mode to their SAN, but it's only active/active if = you have one of the supported operating systems. Presumably, HP also = provides drivers for those OSes which provide some sort of interlock = support, though again, it=E2=80=99s not clear just what sort of = filesystems you can put on the SAN and still keep the active/active = concurrency. It=E2=80=99s very tricky, and the penalty for getting it = wrong is corrupted data, so I=E2=80=99d tend to put my money on an = actual filesystem-level solution which provides concurrent access, like = glusterfs. That just went BETA with FreeBSD support, so who knows, = maybe it=E2=80=99s becoming a viable solution. I have zero experience = with deploying glusterfs, however, so I cannot speak to that. - Jordan