From owner-freebsd-questions@FreeBSD.ORG Fri Oct 5 21:50:51 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id BA1411065670 for ; Fri, 5 Oct 2012 21:50:51 +0000 (UTC) (envelope-from opensolarisisdeadlongliveopensolaris@nedharvey.com) Received: from am1outboundpool.messaging.microsoft.com (am1ehsobe001.messaging.microsoft.com [213.199.154.204]) by mx1.freebsd.org (Postfix) with ESMTP id 138848FC12 for ; Fri, 5 Oct 2012 21:50:50 +0000 (UTC) Received: from mail53-am1-R.bigfish.com (10.3.201.235) by AM1EHSOBE004.bigfish.com (10.3.204.24) with Microsoft SMTP Server id 14.1.225.23; Fri, 5 Oct 2012 21:05:24 +0000 Received: from mail53-am1 (localhost [127.0.0.1]) by mail53-am1-R.bigfish.com (Postfix) with ESMTP id 026E61801CA; Fri, 5 Oct 2012 21:05:24 +0000 (UTC) X-Forefront-Antispam-Report: CIP:157.56.234.85; KIP:(null); UIP:(null); IPV:NLI; H:SN2PRD0410HT005.namprd04.prod.outlook.com; RD:none; EFVD:NLI X-SpamScore: -1 X-BigFish: PS-1(zz1432Izz1202h1d1ah1d2ahzz8275dhz2fh2a8h668h839h944hd25hf0ah107ah1220h1288h12a5h12a9h12bdh137ah13b6h1441h1155h) Received-SPF: pass (mail53-am1: domain of nedharvey.com designates 157.56.234.85 as permitted sender) client-ip=157.56.234.85; envelope-from=opensolarisisdeadlongliveopensolaris@nedharvey.com; helo=SN2PRD0410HT005.namprd04.prod.outlook.com ; .outlook.com ; Received: from mail53-am1 (localhost.localdomain [127.0.0.1]) by mail53-am1 (MessageSwitch) id 1349471122182084_26524; Fri, 5 Oct 2012 21:05:22 +0000 (UTC) Received: from AM1EHSMHS013.bigfish.com (unknown [10.3.201.239]) by mail53-am1.bigfish.com (Postfix) with ESMTP id 2A493460019; Fri, 5 Oct 2012 21:05:22 +0000 (UTC) Received: from SN2PRD0410HT005.namprd04.prod.outlook.com (157.56.234.85) by AM1EHSMHS013.bigfish.com (10.3.207.151) with Microsoft SMTP Server (TLS) id 14.1.225.23; Fri, 5 Oct 2012 21:05:20 +0000 Received: from SN2PRD0410MB372.namprd04.prod.outlook.com ([169.254.8.197]) by SN2PRD0410HT005.namprd04.prod.outlook.com ([10.255.115.40]) with mapi id 14.16.0207.009; Fri, 5 Oct 2012 21:05:15 +0000 From: "Edward Ned Harvey (opensolarisisdeadlongliveopensolaris)" To: Albert Shih , "zfs-discuss@opensolaris.org" Thread-Topic: [zfs-discuss] How many disk in one pool Thread-Index: AQHNozwqwx7wb9MY80aUFc7zmexltperMpqg Date: Fri, 5 Oct 2012 21:05:14 +0000 Message-ID: References: <20121005205748.GA39237@pcjas.obspm.fr> In-Reply-To: <20121005205748.GA39237@pcjas.obspm.fr> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [98.110.161.43] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nedharvey.com Cc: "freebsd-questions@freebsd.org" Subject: RE: [zfs-discuss] How many disk in one pool X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Oct 2012 21:50:51 -0000 > From: zfs-discuss-bounces@opensolaris.org [mailto:zfs-discuss- > bounces@opensolaris.org] On Behalf Of Albert Shih >=20 > I'm actually running ZFS under FreeBSD. I've a question about how many > disks I have in one pool. >=20 > At this moment I'm running with one server (FreeBSD 9.0) with 4 MD1200 > (Dell) meaning 48 disks. I've configure with 4 raidz2 in the pool (one on > each MD1200) >=20 > On what I understand I can add more more MD1200. But if I loose one > MD1200 > for any reason I lost the entire pool. >=20 > In your experience what's the ? 100 disk ? >=20 > How FreeBSD manage 100 disk ? /dev/da100 ? Correct about if you lose one storage tray you lose the pool. Ideally you = would span your redundancy across trays as well as across disks - but in yo= ur situation, 12 disks in raidz2 - and 4 trays - it's just not realistic fo= r you. You would have to significantly increase cost (not to mention rebui= ld pool) in order to keep the same available disk space and gain the redund= ancy. Go ahead and add more trays. I've never heard of any limit of number of di= sks you can have in ZFS. I'm sure there is a limit, but whatever it is, yo= u're nowhere near it.