From owner-freebsd-fs@FreeBSD.ORG Tue Jan 13 10:54:06 2015 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 800292A4 for ; Tue, 13 Jan 2015 10:54:06 +0000 (UTC) Received: from kirk-ext.obspm.fr (kirk-ext.obspm.fr [145.238.193.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "*.obspm.fr", Issuer "TERENA SSL CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 1E38AB41 for ; Tue, 13 Jan 2015 10:54:05 +0000 (UTC) Received: from pcjas.obspm.fr (pcjas.obspm.fr [145.238.184.233]) (authenticated bits=0) by kirk-ext.obspm.fr (8.14.4/8.14.4/DIO Observatoire de Paris - 15/04/10) with ESMTP id t0DAprbq012895 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 13 Jan 2015 11:51:54 +0100 Date: Tue, 13 Jan 2015 11:52:40 +0100 From: Albert Shih To: freebsd-fs@freebsd.org Subject: How many ram... Message-ID: <20150113105240.GA33162@pcjas.obspm.fr> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit User-Agent: Mutt/1.5.23 (2014-03-12) X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.3.9 (kirk-ext.obspm.fr [145.238.193.20]); Tue, 13 Jan 2015 11:51:54 +0100 (CET) X-Virus-Scanned: clamav-milter 0.98.5 at kirk-ext.obspm.fr X-Virus-Status: Clean X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Jan 2015 10:54:06 -0000 Hi all, Basic question : How many amount of ram I need for running ZFS with a pool of ~500-600To. For example If I've a server with 2 disk array of 60 disk of 6To. Is the rule I find somewhere on Internet saying for ZFS 1To --> 1Go is still true ? What's happen If I use less ram ? Like 1To --> 0.5Go ? Less performance ? crash ? Regards. JAS -- Albert SHIH DIO bâtiment 15 Observatoire de Paris 5 Place Jules Janssen 92195 Meudon Cedex France Téléphone : +33 1 45 07 76 26/+33 6 86 69 95 71 xmpp: jas@obspm.fr Heure local/Local time: mar 13 jan 2015 11:49:16 CET