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 F0F981381F3 for ; Tue, 17 Sep 2013 16:44:14 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id CE11CE0C45; Tue, 17 Sep 2013 16:44:10 +0000 (UTC) Received: from mail-we0-f181.google.com (mail-we0-f181.google.com [74.125.82.181]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id A6550E0C2C for ; Tue, 17 Sep 2013 16:44:09 +0000 (UTC) Received: by mail-we0-f181.google.com with SMTP id p61so5148703wes.26 for ; Tue, 17 Sep 2013 09:44:08 -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=ppWyf3bSNq7YUuFZ0qfMzGtijS/x5B0v4Gjx/qKFVKM=; b=xvFqm/euUUVeSZpRegY831ZUj7CwJJh4OyyBDK8gxShL9uXtLabweo/g0UmJt+atTn Y8nFgF5lCHjDQIZNI+4GDPrddI6S6kn0PjWs2isNO8xqW32y358Tk/+WXfq4G7yEjt0/ kR1Lpj6WQNttJ1bDSwwbOZAxzTWGP3lp5/qoAcuGEDEuGl5+bxVVcsdZd8hTu6rLQy2k qEKOppeNzxIS8Q6XfmNTBihRfjnYQb+QpEOUolbuhJ0hcMxK8OlHAwZiCl1kpJ3M7k6u 74yMvEIjYXL93YoJL+c5+ywOseiti7H4pJmWxRcBexLhWldjHK+E6i+sWx89j7w4/rd5 t8jw== X-Received: by 10.180.221.38 with SMTP id qb6mr3293661wic.8.1379436248269; Tue, 17 Sep 2013 09:44:08 -0700 (PDT) Received: from [172.20.0.41] (196-210-126-33.dynamic.isadsl.co.za. [196.210.126.33]) by mx.google.com with ESMTPSA id i8sm5694452wiy.6.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 17 Sep 2013 09:44:07 -0700 (PDT) Message-ID: <523885DC.9000203@gmail.com> Date: Tue, 17 Sep 2013 18:39:56 +0200 From: Alan McKinnon User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130809 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: <52382667.gv/H26XH5nHRnIHS%Joerg.Schilling@fokus.fraunhofer.de> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Archives-Salt: 237d04db-6d8f-41d7-8926-aa5025f9496b X-Archives-Hash: 48d78f07d3e669ba6cf700e3ce663495 On 17/09/2013 15:22, Grant wrote: >>> Performance doesn't seem to be one of ZFS's strong points. Is it >>> considered suitable for a high-performance server? >> >> ZFS is one of the fastest FS I am aware of (if not the fastest). >> You need a sufficient amount of RAM to make the ARC useful. > > How much RAM is that? > > - Grant > 1G of RAM per 1TB of data is the recommendation. For de-duped data, it is considerably more, something on the order of 6G of RAM per 1TB of data. The first guideline is actually not too onerous. It *seems* like a huge amount of RAM, but a) Most modern motherboards can handle that with ease b) RAM is comparatively cheap c) It's a once-of purchase d) RAM is very reliable so once-off really does mean once-off -- Alan McKinnon alan.mckinnon@gmail.com