From owner-freebsd-stable@FreeBSD.ORG Wed Mar 24 22:30:26 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 684A1106564A for ; Wed, 24 Mar 2010 22:30:25 +0000 (UTC) (envelope-from 000.fbsd@quip.cz) Received: from elsa.codelab.cz (elsa.codelab.cz [94.124.105.4]) by mx1.freebsd.org (Postfix) with ESMTP id 272368FC0C for ; Wed, 24 Mar 2010 22:30:24 +0000 (UTC) Received: from elsa.codelab.cz (localhost.codelab.cz [127.0.0.1]) by elsa.codelab.cz (Postfix) with ESMTP id C4E2619E02A; Wed, 24 Mar 2010 23:30:23 +0100 (CET) Received: from [192.168.1.2] (r5bb235.net.upc.cz [86.49.61.235]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by elsa.codelab.cz (Postfix) with ESMTPSA id B323C19E023; Wed, 24 Mar 2010 23:30:20 +0100 (CET) Message-ID: <4BAA927C.802@quip.cz> Date: Wed, 24 Mar 2010 23:30:20 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.1.8) Gecko/20100205 SeaMonkey/2.0.3 MIME-Version: 1.0 To: Michal References: <4BAA3409.6080406@ionic.co.uk> <4BAA4DB6.80604@ionic.co.uk> In-Reply-To: <4BAA4DB6.80604@ionic.co.uk> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-stable@freebsd.org Subject: Re: Multi node storage, ZFS X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Mar 2010 22:30:26 -0000 Michal wrote: > On 24/03/2010 17:14, Freddie Cash wrote: > >> >> Yes, that would be helpful (mirrored slogs, until we get slog removal >> support). >> >> As would an L2ARC (cache) device in the head node. >> >> As well as lots and lots and lots of RAM. >> >> And as fast of ethernet NICs as you can get between the head node and the >> storage nodes. >> >> And, and, and, and ... :) >> > > As far as I know more RAM is more important the fast CPU, so RAM is the > order of the day, and I guess it depends what you think fast CPU is, but > I wasn't planning on a duel CPU or anything top of the range. I have > some duel core's knocking around... Any modern multicore CPU will be fine. And more RAM you have, the larger ARC / prefetch will be used (more read speed you will gain) > Michael, I sort of understand what you are talking about with ZIL, but > not completely, so thanks for the pointers, there are clearly things I > have not thought about. This links can be useful to you ZFS L2ARC http://blogs.sun.com/brendan/entry/test ZFS Evil Tuning Guide http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Disabling_the_ZIL_.28Don.27t.29 ZFS ZIL + L2ARC SSD Setup http://www.mail-archive.com/zfs-discuss@opensolaris.org/msg34674.html Miroslav Lachman