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 16613C4321E for ; Sun, 27 Nov 2022 12:06:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229597AbiK0MGa (ORCPT ); Sun, 27 Nov 2022 07:06:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229506AbiK0MG3 (ORCPT ); Sun, 27 Nov 2022 07:06:29 -0500 Received: from mail.thelounge.net (mail.thelounge.net [91.118.73.15]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E7DE2F017 for ; Sun, 27 Nov 2022 04:06:27 -0800 (PST) Received: from [10.10.10.2] (rh.vpn.thelounge.net [10.10.10.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-256)) (No client certificate requested) (Authenticated sender: h.reindl@thelounge.net) by mail.thelounge.net (THELOUNGE MTA) with ESMTPSA id 4NKnPr6d7rzXLK; Sun, 27 Nov 2022 13:06:24 +0100 (CET) Message-ID: <7316d29a-bab6-b8a2-5c77-803af8de378b@thelounge.net> Date: Sun, 27 Nov 2022 13:06:24 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.0 Subject: Re: how do i fix these RAID5 arrays? Content-Language: en-US To: Wols Lists , John Stoffel Cc: David T-G , Linux RAID list References: <20221123220736.GD19721@jpo> <20221124032821.628cd042@nvm> <20221124211019.GE19721@jpo> <25474.28874.952381.412636@quad.stoffel.home> <62b72b4e-8461-e616-1227-4dcef8853143@youngman.org.uk> From: Reindl Harald Organization: the lounge interactive design In-Reply-To: <62b72b4e-8461-e616-1227-4dcef8853143@youngman.org.uk> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org Am 27.11.22 um 12:52 schrieb Wols Lists: > On 27/11/2022 11:46, Reindl Harald wrote: >> >> >> Am 26.11.22 um 21:02 schrieb John Stoffel: >>> I call it a failure of the layering model.  If you want RAID, use MD. >>> If you want logical volumes, then put LVM on top.  Then put >>> filesystems into logical volumes. >>> >>> So much simpler... >> >> have you ever replaced a 6 TB drive and waited for the resync of mdadm >> in the hope in all that hours no other drive goes down? >> >> when your array is 10% used it's braindead >> when your array is new and empty it's braindead >> >> ZFS/BTRFS don't neeed to mirror/restore 90% nulls > > This is why you have trim. besides that such large disks are typically HDD trim has nothing to do with the fact that after a drive replacement linux raid knows *nothing* about trim and does a full resync you are long enough on this list that you should know that > Although I don't know if raid supports that surely - but you miss the topic