From owner-freebsd-questions@FreeBSD.ORG Sat Jan 6 00:57:17 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org 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 4AE5C16A415 for ; Sat, 6 Jan 2007 00:57:17 +0000 (UTC) (envelope-from illoai@gmail.com) Received: from nf-out-0910.google.com (nf-out-0910.google.com [64.233.182.187]) by mx1.freebsd.org (Postfix) with ESMTP id E035F13C44C for ; Sat, 6 Jan 2007 00:57:16 +0000 (UTC) (envelope-from illoai@gmail.com) Received: by nf-out-0910.google.com with SMTP id x37so8001899nfc for ; Fri, 05 Jan 2007 16:57:15 -0800 (PST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=dlJXKDvvgyXTM0bp4W8Jfzv3iTqZKKkoLySPrS0LzYgAaaoh7IFrC4ZtekSqmtz67m4kXK2c7qoJLD/Fs3SZ/X09X6XROjtPlreHBakjlUVeol0gYcEQsF8cw4XR/u+SMSWLr3af2XzJQ3JuQ15WYPYj86xj9iVEgcPtq6vFYLY= Received: by 10.82.111.8 with SMTP id j8mr2283323buc.1168043485188; Fri, 05 Jan 2007 16:31:25 -0800 (PST) Received: by 10.82.176.4 with HTTP; Fri, 5 Jan 2007 16:31:25 -0800 (PST) Message-ID: Date: Fri, 5 Jan 2007 18:31:25 -0600 From: "illoai@gmail.com" To: robert@webtent.com In-Reply-To: <459EB20C.80702@webtent.net> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <459EB20C.80702@webtent.net> Cc: FreeBSD Subject: Re: Tar backup on geom mirror drive 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: Sat, 06 Jan 2007 00:57:17 -0000 On 05/01/07, Robert Fitzpatrick wrote: > I am backing up a big home partition that results in 46GB tar.gz file > directly to another FreeBSD machine via NFS and it is taking from 9:30pm > until almost 7am the next morning. The source home partition is on a > geom mirrored slice, could this be the reason for such a slow backup? > The destination server is using RAID, but from the BIOS, not geom. Both > servers are using gigabit cards through a gigabit switch. > Lots of potential reasons for it being slow, but on a guess, unless a majority of what you are backing up are text files you will not save very much space by compressing (video and music (or .mp3, .ogg, .avi, .mpg, etc.) are already compressed much better than gzip can) but will incur huge time penalties for redundant and redundant compres- sion. A mirror should result in little or no slowdown in reads (if it is not faster, I cannot recall). The bottleneck may be your network, which would require expertise beyond me to diagnose. As an aside, on a live system many things can cause wild fluctuations in backup speed. -- --