From owner-freebsd-fs@FreeBSD.ORG Wed Jun 12 11:47:34 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 C80D96AD for ; Wed, 12 Jun 2013 11:47:34 +0000 (UTC) (envelope-from ira@wakeful.net) Received: from mail-ob0-x234.google.com (mail-ob0-x234.google.com [IPv6:2607:f8b0:4003:c01::234]) by mx1.freebsd.org (Postfix) with ESMTP id 960FA145E for ; Wed, 12 Jun 2013 11:47:34 +0000 (UTC) Received: by mail-ob0-f180.google.com with SMTP id eh20so13318750obb.11 for ; Wed, 12 Jun 2013 04:47:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type:x-gm-message-state; bh=NEvlZ61Rl9T6Zvl9YEVZ72bKeAoSOc4bQ8uf+x6JMbE=; b=EvCHKBMmO5+b5fyL/xLn9mpYOLKn/liniIFHKWFUlWs8M+0saDKDUe5e8FJEZYRrpE EeiWqLgwcxnOkuF6Y9gjTpXSxxk85+imGDRfkyXIw+Dxk/jWqNnpK1CJ7GIlICokWq77 v1rxBpvzAvsCE30ZYq8V+agjWvLrhyewEIlswfd+vZSxg9NxsPV1W/aCF5/UEYTwCMBo N5rzEnG2U2Dd4oVr8gMdLSsEzkZ+FbaY3Bc6cPXedFRuM5slTAVMnNF2+48LmPbMpCG+ QHIqs3PL3BIWmouWm0dL4ZGiuQIq3JAeoczxrCa4+c117MZGXCzIS8HpW/jAyqegmW3e KrEw== X-Received: by 10.182.237.50 with SMTP id uz18mr15126535obc.51.1371037653970; Wed, 12 Jun 2013 04:47:33 -0700 (PDT) MIME-Version: 1.0 Received: by 10.76.154.202 with HTTP; Wed, 12 Jun 2013 04:47:13 -0700 (PDT) In-Reply-To: References: <51B79023.5020109@fsn.hu> From: Ira Cooper Date: Wed, 12 Jun 2013 07:47:13 -0400 Message-ID: Subject: Re: An order of magnitude higher IOPS needed with ZFS than UFS To: Mark Felder X-Gm-Message-State: ALoCoQkHJ6W87MNF1GWkWnEqkwDkartlbG3olS7l3bPYQvhpU1BzmDG1Q1K5+4e1PZUo8URAg/T0 Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.14 Cc: freebsd-fs@freebsd.org 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: Wed, 12 Jun 2013 11:47:34 -0000 On Wed, Jun 12, 2013 at 7:40 AM, Mark Felder wrote: > On Tue, 11 Jun 2013 16:01:23 -0500, Attila Nagy wrote: > > BTW, the file systems are 77-78% full according to df (so ZFS holds more, >> because UFS is -m 8). >> > > ZFS write performance can begin to drop pretty badly when you get around > 80% full. I've not seen any benchmarks showing an improvement with a very > fast and large ZIL or tons of memory, but I'd expect that would help > significantly. Just note that you're right at the edge where performance > gets impacted. > > If it matches what illumos does. You jump off the same cliff. -Ira