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=-2.5 required=3.0 tests=BAYES_05, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 9B4FAC433DF for ; Fri, 31 Jul 2020 00:16:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7725C2083E for ; Fri, 31 Jul 2020 00:16:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730820AbgGaAQx (ORCPT ); Thu, 30 Jul 2020 20:16:53 -0400 Received: from dcvr.yhbt.net ([64.71.152.64]:53642 "EHLO dcvr.yhbt.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728086AbgGaAQw (ORCPT ); Thu, 30 Jul 2020 20:16:52 -0400 Received: from localhost (dcvr.yhbt.net [127.0.0.1]) by dcvr.yhbt.net (Postfix) with ESMTP id 6B7931F5AE; Fri, 31 Jul 2020 00:16:52 +0000 (UTC) Date: Fri, 31 Jul 2020 00:16:52 +0000 From: Eric Wong To: linux-btrfs@vger.kernel.org Subject: raid1 with several old drives and a big new one Message-ID: <20200731001652.GA28434@dcvr> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org 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.