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 E9FA6C636CC for ; Wed, 15 Feb 2023 14:53:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229920AbjBOOxM (ORCPT ); Wed, 15 Feb 2023 09:53:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229574AbjBOOxJ (ORCPT ); Wed, 15 Feb 2023 09:53:09 -0500 Received: from smtp.hosts.co.uk (smtp.hosts.co.uk [85.233.160.19]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B222439B8D; Wed, 15 Feb 2023 06:53:06 -0800 (PST) Received: from host86-157-192-115.range86-157.btcentralplus.com ([86.157.192.115] helo=[192.168.1.218]) by smtp.hosts.co.uk with esmtpa (Exim) (envelope-from ) id 1pSJ9d-0007e4-6t; Wed, 15 Feb 2023 14:53:05 +0000 Message-ID: <0f5aafed-7b1a-99ac-57fc-c5de9a269b92@youngman.org.uk> Date: Wed, 15 Feb 2023 14:53:04 +0000 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.6.1 Subject: Re: [dm-devel] RAID4 with no striping mode request Content-Language: en-GB To: Roger Heflin , Heinz Mauelshagen Cc: Kyle Sanderson , linux-raid@vger.kernel.org, Song Liu , device-mapper development , John Stoffel , Linux-Kernel References: <25578.37401.314298.238192@quad.stoffel.home> From: Wols Lists In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 15/02/2023 11:44, Roger Heflin wrote: > WOL: current SSD's are rated for around 1000-2000 writes. So a 1Tb > disk can sustain 1000-2000TB of total writes. And writes to > filesystem blocks would get re-written more often than data blocks. > How well it would work would depend on how often the data is deleted > and re-written. When did that guy do that study of SSDs? Basically hammered them to death 24/7? I think it took about three years of continuous write/erase cycles to destroy them. Given that most drives are obsolete long before they've had three years of writes ... the conclusion was that - for the same write load - "modern" (as they were several years ago) SSDs would probably outlast mechanical drives for the same workload. (Cheap SD cards, on the other hand ...) Cheers, Wol