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 X-Spam-Level: X-Spam-Status: No, score=-6.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0FD26C433E0 for ; Fri, 31 Jul 2020 08:29:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE08A2072A for ; Fri, 31 Jul 2020 08:29:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ByFB5eNr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731611AbgGaI3e (ORCPT ); Fri, 31 Jul 2020 04:29:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51790 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728437AbgGaI3e (ORCPT ); Fri, 31 Jul 2020 04:29:34 -0400 Received: from mail-wr1-x42e.google.com (mail-wr1-x42e.google.com [IPv6:2a00:1450:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF4C9C061574 for ; Fri, 31 Jul 2020 01:29:33 -0700 (PDT) Received: by mail-wr1-x42e.google.com with SMTP id f7so27229329wrw.1 for ; Fri, 31 Jul 2020 01:29:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-transfer-encoding:content-language; bh=wZEJxoOWiR9LyfXNNvn1xmE1wNlZX0BnHNg1067lstY=; b=ByFB5eNriT3S49zgV6c6Py/Sdk9n3FmYrZAK8bX7wG4onbmiexLbRcJnM4Wu1LFWGe PF0W2oeYwsCJ/iQ9dJMTVeTYfvCW7XfV/eXUf3ATFLtEhICW0lb6l4sdPZKVaK9jIid0 zDf7RssDeZnrICM557lrJQ/UcNU651OVGyjvd8Azz5mcSMYvKTXf3xvDFacNML+YFGrK CJxbri4H3MsnrS3qppSSlBEoR+UIkplIyTnrkt6gXdoxCHMuA4aQpRli+zRScZhY+VKZ FwwYdPBMz1cSQ6JNZB5JguZsohH8uP3EqJs5qLH0xgDWcLwCxvLe/+5vv6oqt2VBVFGx 9flA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=wZEJxoOWiR9LyfXNNvn1xmE1wNlZX0BnHNg1067lstY=; b=kfBwkGx3JxbeCm59kLCIkIkkUamIxa5+7v3WnLM+5Bco5D4Sf1dO+cvEM1i3BaDzuG ps1gSe8pBZWMsou8GN8S0Clre5doRw7wws0JGj3qRLKLYS5FmODl2GzkN+RDx0Oxm4sH simSUHfQtBiPgdwFPZMgH2R1ydiT/SMNa88PKVLM5R7aekWQx67kIJc++40bv8Cq2GTQ C+QS4F+D94TOhMZo96ZfUHK9iukQrAmkX7iKEnEKDQ74Rse35/4/TNArSJ4BpZeZBOYG ZEl1zcC8VwHusAzhPDBu7YSiGuvM+7TLT7vJCSQmZMZf1S2N36b+bUSKAkfWJkCmBaz8 aiCw== X-Gm-Message-State: AOAM5306ZXlRhkN5CEXclr1iazabjEfR4D+IX8VhDWPOUyStOyrJ46Co YRDPAYBXEFvbe+EThGrROY6zSktZ X-Google-Smtp-Source: ABdhPJwzm8I0LMpw7talDDCkt7YQHB6aKBqcWEZ818hYKZNoy7E5nqmnpJB/Kt32K2IsZAku6Jz/XA== X-Received: by 2002:a05:6000:118c:: with SMTP id g12mr2408715wrx.212.1596184171140; Fri, 31 Jul 2020 01:29:31 -0700 (PDT) Received: from [192.168.111.113] (host-2-114-69-218.business.telecomitalia.it. [2.114.69.218]) by smtp.gmail.com with ESMTPSA id f9sm11960274wrm.62.2020.07.31.01.29.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 31 Jul 2020 01:29:30 -0700 (PDT) Subject: Re: raid1 with several old drives and a big new one To: Eric Wong , linux-btrfs@vger.kernel.org References: <20200731001652.GA28434@dcvr> From: Alberto Bursi Message-ID: <6d29319f-301e-c1d2-9674-b39619356ae7@gmail.com> Date: Fri, 31 Jul 2020 10:29:49 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200731001652.GA28434@dcvr> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 31/07/20 02:16, Eric Wong wrote: > Say I have three ancient 2TB HDDs and one new 6TB HDD, is there > a way I can ensure one raid1 copy of the data stays on the new > 6TB HDD? > > I expect the 2TB HDDs to fail sooner than the 6TB HDD given > their age (>5 years). > > The devid balance filter only affects data which already exists > on the device, so that isn't suitable for this, right? > > Thanks in advance. I'm not sure what is the problem, ok maybe the drives are old and are more likely to fail, but why would more than one drive fail at once? -Alberto