From owner-freebsd-questions@FreeBSD.ORG Wed May 12 14:09:35 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id CBCBA1065679 for ; Wed, 12 May 2010 14:09:35 +0000 (UTC) (envelope-from amvandemore@gmail.com) Received: from mail-qy0-f190.google.com (mail-qy0-f190.google.com [209.85.221.190]) by mx1.freebsd.org (Postfix) with ESMTP id 822F98FC20 for ; Wed, 12 May 2010 14:09:35 +0000 (UTC) Received: by qyk28 with SMTP id 28so239521qyk.27 for ; Wed, 12 May 2010 07:09:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:cc:content-type; bh=kCi7/aJDC5O/nDzIYn1eJjxAKGQD/qoaIjiBPyDfa3o=; b=O0uo0b7wo/WBlLEvv0F6CCE9GcHMJZtQGf/LWE9dseURq9glui4WaYAvmwBBukRyty DzEpUPbReIzWOsvMR3JplCgO1PdVlAzZSd4yuSxHaHWHF8LFzIPScpKcGWPJh4AjaeRm h8kwtfErN3eVy7jc/RkRqLQNF79GiMua+ZH0g= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=sq0Eor0TRB1rKWTaOMY+3AxjLo5NZtnkW6323UPS4nQ2I4Rq4a1XlCBOvJua12RxEY JmZxAwWnkL7hRuKrx+plXMTKZUPvUU5bmRjQ3vqzpnlYRC8nyFLvSf5uhVS8bHkNJk/V +lNJIZk/J5XiM6PaLitWt4M89npIqV8T6FMk4= MIME-Version: 1.0 Received: by 10.224.87.83 with SMTP id v19mr1495385qal.392.1273673374109; Wed, 12 May 2010 07:09:34 -0700 (PDT) Received: by 10.229.99.67 with HTTP; Wed, 12 May 2010 07:09:33 -0700 (PDT) In-Reply-To: References: Date: Wed, 12 May 2010 09:09:33 -0500 Message-ID: From: Adam Vande More To: "A. Wright" Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-questions@freebsd.org Subject: Re: Long I/O pauses on same mass storage X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 May 2010 14:09:35 -0000 On Wed, May 12, 2010 at 8:46 AM, A. Wright wrote: > > I have recently upgraded my system to 8.0, and in the > course of doing so, have migrated most filesystems > onto a new drive. > Did you dd it across? If so, that's kind of a no-no in some situtation as the boundries won't be aligned resulting in slow disk. You should use a different tool like dump/restore. > > This seems to most commonly happen when both reading > and writing tasks are active -- I am unsure whether reads writes must be in > the same partition, or whether > two partitions on the same drive are sufficient. > If this is one of them "eco" drives, you may wish to investigate things like firmware updates etc. You can also try using achi, it has quite a benefits including speed. Make sure to read up on it first. -- Adam Vande More