From owner-freebsd-questions@FreeBSD.ORG Fri Oct 5 21:11:03 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 1D04D106566C for ; Fri, 5 Oct 2012 21:11:03 +0000 (UTC) (envelope-from delphij@delphij.net) Received: from anubis.delphij.net (anubis.delphij.net [64.62.153.212]) by mx1.freebsd.org (Postfix) with ESMTP id ED71A8FC0C for ; Fri, 5 Oct 2012 21:11:01 +0000 (UTC) Received: from epsilon.delphij.net (drawbridge.ixsystems.com [206.40.55.65]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by anubis.delphij.net (Postfix) with ESMTPSA id 1977F1BA03; Fri, 5 Oct 2012 14:11:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=delphij.net; s=anubis; t=1349471461; bh=b69ZHxTZMerd7c5QieogI6WNlMf60BquzcwDPVs4ofg=; h=Date:From:Reply-To:To:CC:Subject:References:In-Reply-To; b=weVhMs4GRZw9VQ2HqcNYAUsmqlYNyfvLRn2tQVQNLXMZvJ9woxboDT2jQfoDr2G8P 2NfOqPhwkPKGpx92wswdApsIOQ+4+Rkv5LuXqGsOiD83myekfrLuWxqoPQsikNv76A KHLtW63kUIbn2fQ7NjAjdcDHIXMnnFgSMrpch/xQ= Message-ID: <506F4CE4.4030608@delphij.net> Date: Fri, 05 Oct 2012 14:11:00 -0700 From: Xin Li Organization: The freeBSD Project User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:10.0.7) Gecko/20120830 Thunderbird/10.0.7 MIME-Version: 1.0 To: Albert Shih References: <20121005205748.GA39237@pcjas.obspm.fr> In-Reply-To: <20121005205748.GA39237@pcjas.obspm.fr> X-Enigmail-Version: 1.4.3 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit 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 Reply-To: d@delphij.net List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Oct 2012 21:11:03 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 10/05/12 13:57, Albert Shih wrote: > Hi all, > > I'm actually running ZFS under FreeBSD. I've a question about how > many disks I «can» have in one pool. > > 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) > > On what I understand I can add more more MD1200. But if I loose one > MD1200 for any reason I lost the entire pool. > > In your experience what's the «limit» ? 100 disk ? > > How FreeBSD manage 100 disk ? /dev/da100 ? We have real system equipped with even more than 100 disks and yes, the devices would be named after their numbers. One thing that you need to keep in mind: if you don't use the zpool.cache and there are a lot of disks, the current implementation could take very long (like several tens of minutes) for the system to import the pool. Another consideration is that larger pools are more vulnerable to damages: should one vdev fails, the whole pool is gone. So make sure you have sufficient redundancy on every vdevs and keep in mind that your JBOD chassis, cable, adapters are all points of failures. Cheers, - -- Xin LI https://www.delphij.net/ FreeBSD - The Power to Serve! Live free or die -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iQEcBAEBCAAGBQJQb0zjAAoJEG80Jeu8UPuzDkIH/RZ07eG9lrlg9vDoe1MEJODu qiVSyidrCHzw53medLOInR+kOt1CJPQX61t2eVyy3oK3MdDj+INtOCGWfO2zXukp PLWvOCzTUoE3A/cSz2KA+1QaXI5kK/CLS4Y0NII7ibwKP7g8/17mvJqCg+UQup3K Y3+t0+QTL9iSOtMtrgdL3ft/5DnjoU10RlKhDzjevRwNTaO+cmcr9AW5RnINTUrD Ig1Zv3rOu+wc0hJ2pDIT8+LC6lIhjmGBi5e3iow5tf3P5VgVRbNAGufFtmVloO1q tPVJyxK+yWK0+5FIXeeKuVeVbDGmpdtwe2+xpqbd2pnLb6Swh8jLD3ojJwAF4r4= =HacZ -----END PGP SIGNATURE-----