From owner-freebsd-stable@FreeBSD.ORG Tue Apr 22 15:00:12 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 0212D106566B for ; Tue, 22 Apr 2008 15:00:12 +0000 (UTC) (envelope-from arnaud.houdelette@tzim.net) Received: from alaranth.tzim.net (unknown [IPv6:2001:41d0:1:968f:219:d1ff:fedf:4f29]) by mx1.freebsd.org (Postfix) with ESMTP id 7896D8FC1C for ; Tue, 22 Apr 2008 15:00:11 +0000 (UTC) (envelope-from arnaud.houdelette@tzim.net) Received: from localhost ([127.0.0.1]) by alaranth.tzim.net with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.69 (FreeBSD)) (envelope-from ) id 1JoJyO-000CZ6-1N; Tue, 22 Apr 2008 16:59:56 +0200 Message-ID: <480DFD72.7060109@tzim.net> Date: Tue, 22 Apr 2008 17:00:02 +0200 From: Arnaud Houdelette User-Agent: Thunderbird 2.0.0.12 (Windows/20080213) MIME-Version: 1.0 To: Miroslav Lachman <000.fbsd@quip.cz> References: <396418019.20080409104542@serebryakov.spb.ru> <47FCBAFB.9060508@tzim.net> <4956a5e50804191912g52833c35q868827dc2b54e5ae@mail.gmail.com> <480AE7AA.5090204@tzim.net> <480B9373.50603@quip.cz> In-Reply-To: <480B9373.50603@quip.cz> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Authenticated-User: tzim@tzim.net X-Authenticator: plain 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: Tue, 22 Apr 2008 15:00:12 -0000 Miroslav Lachman a écrit : > 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 Hi Box is an AMD64 3200+ with 512MB of RAM. The only tuning I did to get rid of panics : vm.kmem_size="512M" vm.kmem_size_max="512M" I did not disable prefetch nor zil. But It's only a home NAS : load on the filesystem is reduced : samba, and rarely more than 2 client PC. Arnaud Houdelette