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 CFD661381F3 for ; Tue, 17 Sep 2013 18:00:27 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id F3A76E0D0C; Tue, 17 Sep 2013 18:00:06 +0000 (UTC) Received: from mail-bk0-f46.google.com (mail-bk0-f46.google.com [209.85.214.46]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id B04F5E0C8E for ; Tue, 17 Sep 2013 18:00:05 +0000 (UTC) Received: by mail-bk0-f46.google.com with SMTP id 6so2318529bkj.5 for ; Tue, 17 Sep 2013 11:00:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; bh=Ez8MW7IgoXnb9e21uj78p1TbS27aaD4qvXp0aTKL3z4=; b=SH3uTQ49RpEdN/Xg3WttE04yPA0viSDxtowLlm1NU3boEvNrz9/sismAIW6DHqwW6V KuUNP4//NTePvVHyLLIU3YoyLxBOEakm6btJ1O7w0O8yXoUOa5amVVQtUpj1aBY2jZZd wh8d6Ku6tATwMj+H60xgaZK9DFEuzc1CaukZeRBJtC2F0LO9JgoAAD4xl6mw57QRhfen c5Y0DqWyK5PRczdZS3SFsdiS3x72Rqj5tapiH7FVDPd9CQ9jL1AEcVkMsD5kG25JXCvm BTaYM/BjPNxwYQc45jS1SgIwyAv7QKDl6ttKQrsB9DAfrHyslVrglkZd9Atfdm6DEsvI CsaQ== X-Received: by 10.204.224.142 with SMTP id io14mr8251253bkb.27.1379440804275; Tue, 17 Sep 2013 11:00:04 -0700 (PDT) Received: from [192.168.178.21] (p3E9E696F.dip0.t-ipconnect.de. [62.158.105.111]) by mx.google.com with ESMTPSA id qg7sm10844418bkb.6.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 17 Sep 2013 11:00:03 -0700 (PDT) Message-ID: <523898A3.7000404@googlemail.com> Date: Tue, 17 Sep 2013 20:00:03 +0200 From: Volker Armin Hemmann User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130807 Thunderbird/17.0.8 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] ZFS References: In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit X-Archives-Salt: b7552dfe-2506-4379-81ae-8ff99249fd03 X-Archives-Hash: bcb53ef95e490bca43a25bc6401477a6 Am 17.09.2013 09:20, schrieb Grant: > I'm convinced I need 3-disk RAID1 so I can lose 2 drives and keep > running. I'd also like to stripe for performance, resulting in > RAID10. It sounds like most hardware controllers do not support > 6-disk RAID10 so ZFS looks very interesting. > > Can I operate ZFS RAID without a hardware RAID controller? > > >From a RAID perspective only, is ZFS a better choice than conventional > software RAID? > > ZFS seems to have many excellent features and I'd like to ease into > them slowly (like an old man into a nice warm bath). Does ZFS allow > you to set up additional features later (e.g. snapshots, encryption, > deduplication, compression) or is some forethought required when first > making the filesystem? > > It looks like there are comprehensive ZFS Gentoo docs > (http://wiki.gentoo.org/wiki/ZFS) but can anyone tell me from the real > world about how much extra difficulty/complexity is added to > installation and ongoing administration when choosing ZFS over ext4? > > Performance doesn't seem to be one of ZFS's strong points. Is it > considered suitable for a high-performance server? > > http://www.phoronix.com/scan.php?page=news_item&px=MTM1NTA > > Besides performance, are there any drawbacks to ZFS compared to ext4? > do yourself three favours: use ECC ram. Lots of it. 16GB DDR3 1600 ECC ram cost you less than 170€. And it is worth it. ZFS showed me just how many silent corruptions can happen on a 'stable' system. Errors never seen neither detected thanks to using 'standard' ram. turn off readahead. ZFS' own readahead and the kernel's clash - badly. Turn off kernel's readahead for a visible performance boon. use noop as io-scheduler.