From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C0981C433EF for ; Wed, 9 Mar 2022 03:02:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231590AbiCIDDl (ORCPT ); Tue, 8 Mar 2022 22:03:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231589AbiCIDDl (ORCPT ); Tue, 8 Mar 2022 22:03:41 -0500 Received: from www18.qth.com (www18.qth.com [69.16.238.59]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E4E61D0C1 for ; Tue, 8 Mar 2022 19:02:42 -0800 (PST) Received: from [73.207.192.158] (port=42296 helo=justpickone.org) by www18.qth.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nRmb4-0001YY-0b for linux-raid@vger.kernel.org; Tue, 08 Mar 2022 21:02:41 -0600 Date: Tue, 8 Mar 2022 22:02:40 -0500 From: David T-G To: Linux RAID Subject: Re: backups and losses (was "Re: striping 2x500G to mirror 1x1T") Message-ID: <20220309030239.GF4455@justpickone.org> References: <20220305044704.GB4455@justpickone.org> <335f6238-9329-7616-051f-075706ac9022@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <335f6238-9329-7616-051f-075706ac9022@gmail.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - www18.qth.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - justpickone.org X-Get-Message-Sender-Via: www18.qth.com: authenticated_id: dmail@justpickone.org X-Authenticated-Sender: www18.qth.com: dmail@justpickone.org X-Source: X-Source-Args: X-Source-Dir: Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org Natanji, et al -- ...and then Natanji said... % % Hello David, % what you propose here should work, but be aware that you are essentially % first writing all data to the 2 smaller drives and then reading from them % only when the mirror 1 TB disk gets added. If there are bad sectors that % only gets dicovered while reading (not writing), you might lose data. A much [snip] Thanks for the input! While I'd love to have the luxury of redundant backups and more devices, that's out of the cards on this little server :-/ However, after I rsync across all content I then use diff -r to check it, so I have to read each byte on each side anyway. That gives me at least a little more confidence! Have a great day :-D -- David T-G See http://justpickone.org/davidtg/email/ See http://justpickone.org/davidtg/tofu.txt