From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) by finch.gentoo.org (Postfix) with ESMTP id 00638138CBF for ; Tue, 5 May 2015 06:41:25 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 854F7E086A; Tue, 5 May 2015 06:41:17 +0000 (UTC) Received: from mail-wi0-f177.google.com (mail-wi0-f177.google.com [209.85.212.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id 3DC9EE07F1 for ; Tue, 5 May 2015 06:41:16 +0000 (UTC) Received: by wiun10 with SMTP id n10so133604134wiu.1 for ; Mon, 04 May 2015 23:41:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; bh=0mGjSfimZEMh+H3fUDREx0sF1wE/MhrcbTSXRxRVcNU=; b=fJ9LkeCGyDCqzkdDy0cJhzo4r+eI5WdQhxHcrcbTTPK0lle716aHiksxEBkCFO6JpB YqGUWAH2eYGYfwK6hZ51kQB0LGyTnBQFny01rGDfbI9ujLHPDhxvgmOB2eZY1o6144+U 27yNjsDhsL67L5A/m9RU8wIY7tik6K8tYxdJ99Xcxtd76AzjBaFbsXxG3gzB/SjvxYxf 3+5kSxAy/UnjJoZez0ftHH8nxr0EXvxAdpBvmSg4kb/T2CRdwLi6WlMVbgOfnLZBqO31 Yh8QwQX23dxyQKr6vLNNccxsnqlsG458HhEuFc8ApaUR9LCKmHdHfH5UmbZnXLFhUL0s tu0w== X-Received: by 10.180.188.193 with SMTP id gc1mr1023076wic.7.1430808075055; Mon, 04 May 2015 23:41:15 -0700 (PDT) Received: from [172.20.0.41] ([105.210.25.151]) by mx.google.com with ESMTPSA id l3sm14513400wik.16.2015.05.04.23.41.13 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 04 May 2015 23:41:14 -0700 (PDT) Message-ID: <55486609.9000103@gmail.com> Date: Tue, 05 May 2015 08:41:13 +0200 From: Alan McKinnon User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] Hard drive storage questions References: <553F474E.4040101@gmail.com> <553FA0DD.1090101@gmail.com> <20150428162448.160e1683@digimed.co.uk> <55407695.7000808@gmail.com> <20150429085217.38864030@hactar.digimed.co.uk> <5547221E.4020809@gmail.com> <20150504084626.26fbbbd8@digimed.co.uk> <55472C94.1080606@gmail.com> <20150504113149.0f61d4f9@digimed.co.uk> In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Archives-Salt: 2fef9001-0788-47b6-b71a-6b694e4ca79a X-Archives-Hash: acb1637733859a369fc6568534094f10 On 04/05/2015 20:42, Nuno Magalhães wrote: > Greetings gents. > > I may have missed it, but i haven't seen this suggested yet: RAID+LVM. > If you already have a 3TB drive, buy another (or two more) and build a > RAID1 or 5 array on them. Then build your LVM on top of /dev/md0 (or > whatever device your raid is). > > Another approach is ZFS with RAID-Z or similar. I don't know how/if > ZFS splits data among the drives, but i assume it's wise enough to do > so in a way similar to a RAID+LVM combo. That's a good analogy. ZFS spreads it's data out across multiple drives using an n-drives for data plus m-drives for parity type setup. And the whole lot forms a storage pool. The main difference is that ZFS does all it's checksumming in software, and it's one monolithic system. You can think of it being sort of a combination of RAID and LVM features, but it's not implemented that way. > If going RAID, make sure the rpm and cache are the same for > performance's sake, and you can mix and match drives from different > vendors (perhaps you should, to add to the redundancy). > > I don't know about btrfs, seems like it's still in a testing-phase so > i'm not touching it yet. > > Just my 2¢ > > Cheers, > Nuno > -- Alan McKinnon alan.mckinnon@gmail.com