From owner-freebsd-stable@FreeBSD.ORG Sun Apr 20 19:18:24 2008 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 5A2E61065671 for ; Sun, 20 Apr 2008 19:18:24 +0000 (UTC) (envelope-from 000.fbsd@quip.cz) Received: from elsa.codelab.cz (elsa.codelab.cz [91.103.162.4]) by mx1.freebsd.org (Postfix) with ESMTP id 1A8E68FC13 for ; Sun, 20 Apr 2008 19:18:23 +0000 (UTC) (envelope-from 000.fbsd@quip.cz) Received: from localhost (localhost.codelab.cz [127.0.0.1]) by elsa.codelab.cz (Postfix) with ESMTP id E1E6619E019; Sun, 20 Apr 2008 21:02:59 +0200 (CEST) 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 76F0319E027; Sun, 20 Apr 2008 21:02:57 +0200 (CEST) Message-ID: <480B9373.50603@quip.cz> Date: Sun, 20 Apr 2008 21:03:15 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.12) Gecko/20050915 X-Accept-Language: cz, cs, en, en-us MIME-Version: 1.0 To: Arnaud Houdelette References: <396418019.20080409104542@serebryakov.spb.ru> <47FCBAFB.9060508@tzim.net> <4956a5e50804191912g52833c35q868827dc2b54e5ae@mail.gmail.com> <480AE7AA.5090204@tzim.net> In-Reply-To: <480AE7AA.5090204@tzim.net> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-stable@freebsd.org Subject: Re: [SO]HO Software RAID5 server: which implementation should I choice? 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: Sun, 20 Apr 2008 19:18:24 -0000 Arnaud Houdelette wrote: [...] > Geom_raid5 is (unfortunatly ?) not part of Freebsd base. > You'll have to download and install the module and utility binaries and > follow the (simple) instructions from this website : > http://home.tiscali.de/cmdr_faako/graid5-howto.html > > In the meantime, somebody convinced me to give zfs a try, I backed up my > data, converted the raid array to raidz pool and I must say I'm not > disappointed. > + Read performance (~160 Mo/s) > + Instant snapshots > + zfs filesystems goodness > + better support from the community > - Stability issues : zfs and kernel need to be tuned > - Drive crash scenario may be a bit more complex Do you have any stability issues after tuning? What settings you are using? I am testing ZFS for a short time with these values: vm.kmem_size="1024M" vm.kmem_size_max="1024M" vfs.zfs.prefetch_disable="1" kern.maxvnodes="400000" vfs.zfs.zil_disable="1" (on Sun Fire X2100 with 4GB of RAM and FreeBSD 7.0-RELEASE amd64) It seems to be stable. Miroslav Lachman