From owner-freebsd-fs@FreeBSD.ORG Thu Feb 21 00:19:22 2013 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id C0C1E1E8 for ; Thu, 21 Feb 2013 00:19:22 +0000 (UTC) (envelope-from grarpamp@gmail.com) Received: from mail-ve0-f169.google.com (mail-ve0-f169.google.com [209.85.128.169]) by mx1.freebsd.org (Postfix) with ESMTP id 86D7378D for ; Thu, 21 Feb 2013 00:19:22 +0000 (UTC) Received: by mail-ve0-f169.google.com with SMTP id 15so7638032vea.0 for ; Wed, 20 Feb 2013 16:19:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:content-type; bh=dUfPOYubUiyl+ilqHJYQ9xGlvBUm11Qw0LWBIYxIjv4=; b=XsD1Ru1fW6PHkJ7axwLHNZu+lF1wpfJ7F+jX7nyXtMtOThGU45UsE8g6a58RgtrVqV sEzR1ASKak1azmbQ9hsVVQ9DDF25aoWG4GwP298aL0hChaFLjvWe6PzCQs5m9Rv6Mqg6 GBPO7P5AcOXxs0l+3NJyndb6xHrxuLnOuBUi2FywGL7KPHKm2+l2EZf0DB2VsPql5d6E xW6zh18qAM+nMBJ9scs7XR1awRyKySTEXImHiK84qyenpSwFA7MubWd+PxxnTJDXTVW8 bw1Yji9U5dVBmMhGygvBPFgecKfqC/F9fJqtTje8OWiyUg0TeYcVpdsAxRu3BDXPqciH pg5g== MIME-Version: 1.0 X-Received: by 10.52.22.194 with SMTP id g2mr25371345vdf.91.1361405956612; Wed, 20 Feb 2013 16:19:16 -0800 (PST) Received: by 10.220.219.79 with HTTP; Wed, 20 Feb 2013 16:19:16 -0800 (PST) In-Reply-To: <20130215171144.710bf9af@fabiankeil.de> References: <20130215171144.710bf9af@fabiankeil.de> Date: Wed, 20 Feb 2013 19:19:16 -0500 Message-ID: Subject: Re: Crazy ZFS ZIL options: md(4) umass(4) From: grarpamp To: freebsd-fs@freebsd.org Content-Type: text/plain; charset=UTF-8 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Feb 2013 00:19:22 -0000 Still digesting this thread in free time. There are some articles too... http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide http://www.slideshare.net/relling/zfs-tutorial-lisa-2011 http://constantin.glez.de/blog/2010/07/solaris-zfs-synchronous-writes-and-zil-explained http://dtrace.org/blogs/brendan/2009/06/26/slog-screenshots/ https://espix.net/~wildcat/txt/zfs-fragmentation.txt http://pthree.org/2012/12/06/zfs-administration-part-iii-the-zfs-intent-log/ http://www.techforce.com.br/news/layout/set/print/linux_blog/zfs_part_4_sustained_random_small_files_sync_write_iops Whatever happened to the old ISA ExpandedDRAM drives? Today, bus based internal boards given mobo support of lots of ram don't seem to make too much sense. But there has to be a cheap SATA interface version of these things... a drive tray where you can just stuff it with DIMMs and a battery. Cheap as in, am I missing an entire class of $20-$50 devices here? That's all they should cost in parts (minus ram), yet all I see are $multikilo 'enterprise' stuff. If that's really the case one could make them from China. I can't see burning up an SSD (cost) for non-enterprise use. I'll test with USB to expose failure modes. Will probably end up with RAMZIL/syncdisable or adding a 10k spindle pair.