From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1NxV05-0003tp-De for garchives@archives.gentoo.org; Fri, 02 Apr 2010 00:44:41 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 0122AE0851; Fri, 2 Apr 2010 00:43:28 +0000 (UTC) Received: from mail-pw0-f53.google.com (mail-pw0-f53.google.com [209.85.160.53]) by pigeon.gentoo.org (Postfix) with ESMTP id BA5B1E0851 for ; Fri, 2 Apr 2010 00:43:27 +0000 (UTC) Received: by pwj10 with SMTP id 10so1374437pwj.40 for ; Thu, 01 Apr 2010 17:43:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:received:message-id:subject:from:to:content-type; bh=yThBhDmLZekIDVa/Yy2sy8d6NUZEMkPXpz9qyMCEcKc=; b=X0M8VzmFxBri7XX8gCO5CR7eq49UEDCizpu1G20FZmZusmp4EA7y729vUlNicg/b9S 3IIridhiOXm2Sw9YwuyPJIlb+35Uj86p3ELK9fpYW8oXIoL6u9ZTsE6Nd252mKyOOtNB UkUeE9ishyCEQI1VMP/B3KtjSReVIR6j5wMNg= 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 :content-type; b=XFRz+pvg3QQ8NfJ1YR2ZtwgdZvXqx07nEBOObE18HMWll8FR2ze5mHdikNqH7kENcP nWaJSsaeuv+gUBuhtzGDfulS1HRx1fFyQX46gxK+R9HrEL1v/quY3zzUwKrG8l4BP4jh yIAUFy0RpyvbhQTCFV1pdxumPU6K61RWnySAU= Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Received: by 10.143.13.4 with HTTP; Thu, 1 Apr 2010 17:43:27 -0700 (PDT) In-Reply-To: References: <20100401224820.GA5637@syscon4.inet> Date: Thu, 1 Apr 2010 17:43:27 -0700 Received: by 10.142.61.24 with SMTP id j24mr600770wfa.177.1270169007249; Thu, 01 Apr 2010 17:43:27 -0700 (PDT) Message-ID: Subject: Re: [gentoo-user] Duplicate identical Hard Disk From: Mark Knecht To: gentoo-user@lists.gentoo.org Content-Type: text/plain; charset=UTF-8 X-Archives-Salt: 93e7454d-b525-4d92-a5c7-1412415eb599 X-Archives-Hash: 088da9761ea80c244d597d9e4ee25f20 On Thu, Apr 1, 2010 at 4:02 PM, Paul Hartman wrote: > On Thu, Apr 1, 2010 at 5:48 PM, Joseph wrote: >> I have two identical HD in the box and want to duplicate sda to sdb; >> sdb is not even partitioned. >> I think I could do: >> dd if=/dev/sda of=/dev/sdb >> but I need to boot from CD isn't it? > > Yes, basically, boot from USB or CD and use ddrescue to clone it, then > edit your fstab and I think you should be good. > > RAID1 would help if a drive physically dies, but if you had any > filesystem corruption or anything you'd just have an identically > corrupt copy on the second disk. A big part of my struggles over the last few days has been with mdadm & RAID1. I'm learning that we don't want to send someone down that path unless he has the right sort of disks. I'm having to deal with returns and reordering due to this. People should be aware of what is really required to do RAID before they get started so they don't duplicate my trials. I wasn't and I'm paying for it. (Almost literally if I don't get the drives in the mail!) ;-) Cheers, Mark