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 EBC2CC4332F for ; Sun, 4 Dec 2022 13:04:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229938AbiLDNEo (ORCPT ); Sun, 4 Dec 2022 08:04:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58642 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229539AbiLDNEn (ORCPT ); Sun, 4 Dec 2022 08:04:43 -0500 Received: from mail.thelounge.net (mail.thelounge.net [91.118.73.15]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3E8CCDFA6 for ; Sun, 4 Dec 2022 05:04:37 -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) server-digest SHA256) (No client certificate requested) (Authenticated sender: h.reindl@thelounge.net) by mail.thelounge.net (THELOUNGE MTA) with ESMTPSA id 4NQ6Mk1vWhzXLf for ; Sun, 4 Dec 2022 14:04:29 +0100 (CET) Message-ID: <6d67a7a2-ca24-1dd3-a124-28c9f41a840d@thelounge.net> Date: Sun, 4 Dec 2022 14:04:28 +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: batches and serial numbers (was "Re: md vs LVM and VMs and ...") Content-Language: en-US To: Linux RAID list References: <20221124211019.GE19721@jpo> <512a4cdd-9013-e158-7c77-7409cd0dc3a1@youngman.org.uk> <20221125132259.GG19721@jpo> <20221125194932.GK19721@jpo> <20221128142422.GM19721@jpo> <20221203054130.GP19721@jpo> <1e419d58-46d8-affa-36dc-ef8c14760305@youngman.org.uk> <20221203180425.GU19721@jpo> From: Reindl Harald Organization: the lounge interactive design In-Reply-To: <20221203180425.GU19721@jpo> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org Am 03.12.22 um 19:04 schrieb David T-G: > % But if all your drives are the same make, model(, and batch), there is a not > % insignificant risk they will all share the same defects, and fail at the > % same time. It's accepted the risk is small, but it's there. > > What is the problem? Is it the manufacturer's firmware? Is it the day > they were made? you simply don't know until the problem hits you not so long ago some HP enterprise SSDs for example had a timebomb in their firmware by some 32bit counter (power on i think) which killed the complete device when not fixed with a firmware update - when that happens and all your drives are the same type and bougzt at the same day your RAID is gone forever it's simply common sense that two drives with different ages and from different vendos are unlikely failaing within a few hours for the same reason on a 4 disk RAID10 i prefer 2 different disk series with a different age by at least one month whenever possible