From owner-freebsd-stable@FreeBSD.ORG Sun Jan 4 08:33:29 2009 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 E0A93106566C for ; Sun, 4 Jan 2009 08:33:29 +0000 (UTC) (envelope-from fjwcash@gmail.com) Received: from wa-out-1112.google.com (wa-out-1112.google.com [209.85.146.179]) by mx1.freebsd.org (Postfix) with ESMTP id B58D28FC13 for ; Sun, 4 Jan 2009 08:33:29 +0000 (UTC) (envelope-from fjwcash@gmail.com) Received: by wa-out-1112.google.com with SMTP id m34so3863991wag.27 for ; Sun, 04 Jan 2009 00:33:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=4e0yvt3WD65oGztdqxtjx//nj0y9ttK2QMGBM+TpxqE=; b=MCChIcro82eixiNx8yMJWzsrIiqcaTCey5DB8dpyFCsr6scsBLdshGcXV77cJTf+NU ll8NYM6A0ctA4dvxT8ClIAsSXzhnE6wp0KaH4m6eNzOjlV904vwA7mP5/zaBI6hEzo50 SpW/3QO6uc44wRW+wuAN4MDY0myuSFfLvLe7E= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=ArsWExZaIF9+pZKrRiS9E8aiHeX5yoUdigAfGjmPGCHauCK9q1o/c/p1oJy85QeyII QBIVDTAhHVT3HorbPNm47sZeFz+9BMVU3E1upNVCnCLiywJ3nezyN/P2n0AX/x+4+OEe aTelCW7z0I0ymLXDdxc6I/X/IeZs5epanwXKg= Received: by 10.115.46.10 with SMTP id y10mr12985829waj.33.1231056590278; Sun, 04 Jan 2009 00:09:50 -0800 (PST) Received: by 10.114.122.17 with HTTP; Sun, 4 Jan 2009 00:09:50 -0800 (PST) Message-ID: Date: Sun, 4 Jan 2009 00:09:50 -0800 From: "Freddie Cash" To: freebsd-stable@freebsd.org In-Reply-To: <496026BE.3080107@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <496011CC.2010201@modulus.org> <496026BE.3080107@gmail.com> Subject: Re: slow zvol performance compared to files on the same pool 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, 04 Jan 2009 08:33:30 -0000 On Sat, Jan 3, 2009 at 7:02 PM, David Ehrmann wrote: > Andrew Snow wrote: >> >> On 7.x (where ZFS is really quite broken for server use - don't waste too >> much time on it) > > How exactly is it broken? I know there are some issues, but so serious > you'd say it's broken? It's not "broken" on 7.1, it just requires manual tuning and monitoring. Preferably, it should only be run on amd64 systems with lots of RAM, but it can be run on i386 systems with at least 2 GB of RAM (some people have it running on 32-bit systems with less RAM). ZFS in 8-CURRENT is a more recent version (v13 I believe, while 7.1 is v6), and has a bunch of auto-tuning features, along with a much higher kmem_size_max setting (512 GB vs 2 GB I believe). -- Freddie Cash fjwcash@gmail.com