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 8D644138CD0 for ; Tue, 19 May 2015 12:54:38 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 0B732E0940; Tue, 19 May 2015 12:54:28 +0000 (UTC) Received: from mail-ig0-f182.google.com (mail-ig0-f182.google.com [209.85.213.182]) (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 05245E08CD for ; Tue, 19 May 2015 12:54:26 +0000 (UTC) Received: by igcau1 with SMTP id au1so12876356igc.1 for ; Tue, 19 May 2015 05:54:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:content-type; bh=1IpxuJJqK5I1soSNXWKbnhWTFEAveSpbazDhRnehBT0=; b=wWXIJTPqHi4uyLTsJeqoc/LCDK9A8rmbjLQGlP7v6nrphsrbM1xAGJF+LYRdpYp/Zz ncDGbJ+zbuL7aJiVOEDJX2R1Rt7RAErh14j/xTY7Wo1t8Np3g8CzMnduHLA22bvZtkVr Da3ozvr5uYFRuxfaOikJkZFAvz4PFf2ykMLAo31YNFCeF1DBif1bo8u79TC/H9zefSEO wwb6d/FH086z2hCUlmKxCyNLAa5ZaI0jVWsqeHLzRPwtf58lCBv1pcg+lVRQF3+xuSN9 V5/cS+4xoWJe6nA0Waz7RgD9Txj1nm4po/STDsgLs3Gvh2x5naS5LBJ4SeChA/r0MxrI 69EQ== 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 X-Received: by 10.50.47.44 with SMTP id a12mr8065622ign.10.1432040066250; Tue, 19 May 2015 05:54:26 -0700 (PDT) Sender: freemanrich@gmail.com Received: by 10.107.159.81 with HTTP; Tue, 19 May 2015 05:54:26 -0700 (PDT) In-Reply-To: <20150519111325.7a8c1ff4@digimed.co.uk> References: <29229163.gfWtQPVkRf@wstn> <5558EDD9.6070405@xunil.at> <1500852.2oVy5fePGK@wstn> <20150519111325.7a8c1ff4@digimed.co.uk> Date: Tue, 19 May 2015 08:54:26 -0400 X-Google-Sender-Auth: _vxwEpr6pM2p92WM79BV1d37lJE Message-ID: Subject: Re: [gentoo-user] Tips for fresh install with GRUB2+RAID1+LVM2 From: Rich Freeman To: gentoo-user@lists.gentoo.org Content-Type: text/plain; charset=UTF-8 X-Archives-Salt: bdf391af-f7b6-4018-bee6-720f86de9c97 X-Archives-Hash: 8626db4d8ef03e9a1c7d32ada87a9fa7 On Tue, May 19, 2015 at 6:13 AM, Neil Bothwick wrote: > On Tue, 19 May 2015 10:02:38 +0100, Peter Humphrey wrote: > >> > skip mdadm and lvm ... and try btrfs as you have the chance on shiny >> > new hardware >> >> I also have a spare external hard disk, which I could experiment with >> for snapshots etc. > > Snapshots are subvolumes in btrfs, so they stay in the same filesystem. > That's why they are so fast. > > It's a similar situation with ZFS. Yup. In both cases they're copy-on-write, so they don't consume additional space except to the extent that things change. Also, in both cases you can serialize a snapshot (either in its entirety or as a diff vs a previous snapshot) and store it on separate storage. This is mainly done for backup (storing the serialized files) or replication (replaying them onto another server with the same filesystem). But, neither ZFS nor btrfs are without issue on Linux, so I'd use care in a production environment. The btrfs issues tend to revolve around stability, and the zfs issues tend to revolve around dealing with out-of-mainline code and legal/license issues. -- Rich