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=-2.7 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,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 B7764C64E8A for ; Wed, 2 Dec 2020 01:22:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 669B92158C for ; Wed, 2 Dec 2020 01:22:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726619AbgLBBWf (ORCPT ); Tue, 1 Dec 2020 20:22:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34430 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726054AbgLBBWe (ORCPT ); Tue, 1 Dec 2020 20:22:34 -0500 Received: from mail-lf1-x12e.google.com (mail-lf1-x12e.google.com [IPv6:2a00:1450:4864:20::12e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5CCEDC0613CF for ; Tue, 1 Dec 2020 17:21:54 -0800 (PST) Received: by mail-lf1-x12e.google.com with SMTP id q13so170515lfr.10 for ; Tue, 01 Dec 2020 17:21:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=3mVTg09lbk0wjPFUJXmxCZ5EZg61GjLp5n6o5phJfKU=; b=m0lW0mrFCD4CcxVExw5aZtwvtSz4QsjqGHyI+eP43ItiogkgUnZAj5e5REeNCSTuex Z++6hY/9XrrNx7vNunzhm4WPe21srVNrjhyiho4PlcwjDIeh0oSSHQeJdkie10WJImlZ c5YYREjqmIPv3pywXhFtHmu74+BnHMVBdYUYd+RDlyupPCEB7YQ9waLtjHTJwmd17Nbp /uPvpAtNFZzGdTGhsRadHtC6FsGfGziHbGo7c0Lf55PuYGxlx8pOAhRPljQv7Kbyqg5L Cflpt3JObKD0yFSxx6j3PADo4F7TSeTOubrXMNwo2A5FuyC7batJdz+OfRMW3NK5DGU8 7zaA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=3mVTg09lbk0wjPFUJXmxCZ5EZg61GjLp5n6o5phJfKU=; b=eRp+fTMQIkxwnUwDdtjsO4rEwoKZGdtycnqeK1/yKxB8ho40NF2KhewfRYYQFpjxc6 kXFHHUoSKc7p5jorL2y7ef9UgVwcH3trQZeF2iTqjzy/DQOQkhK+/+spumsA+l0v5Wwd flfVnPpCO0AcKRgrwR0ajxv8yoz1ApLJMNcKs1JfitJvCw0r0X+25jrnhd7iEC9XEAAL RywM2dY9/TwKwdpni7oqwSfcOhJMb/1aqcIz9NEfrbiUtwUcdbDQlcVhCqpXrgp0qLFO PWVWhPR5lGcFEVS2072V3Wm3hpJeAoN2ajlkld0quIAWf4ic24DVKqJ2AxTyPdIusizc 1v5A== X-Gm-Message-State: AOAM533j5tQEcxi2Bn4eVsRiMPE6mEd3j5UyNkjtnQ8xTNlpMgcOuXev Mi6+gk8z+O0G4gFB13o3vOSuN+05BvOCvu1y57k= X-Google-Smtp-Source: ABdhPJw+fJLbVtgG8efbG2SX3UuXiczeD5QV/p+jRRCNgbpfBJHpliL/eiBOFnWfBN2ixuWe4FY5yNRyY1VeMW3LJ9M= X-Received: by 2002:a19:8353:: with SMTP id f80mr153016lfd.348.1606872112415; Tue, 01 Dec 2020 17:21:52 -0800 (PST) MIME-Version: 1.0 References: <5FC62A4F.9000100@youngman.org.uk> In-Reply-To: From: Roger Heflin Date: Tue, 1 Dec 2020 19:21:41 -0600 Message-ID: Subject: Re: Fwd: [OT][X-POST] RAID-6 hw rebuild speed To: Gandalf Corvotempesta Cc: Wols Lists , "General discussion - ask questions, receive answers and advice from other ZFS users" , Linux RAID Mailing List Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org 122 to 204 MB/sec old if efficient writing all would take about an hour. 200 to 300 MB/sec new. if efficient writing all 600gb woudl take 2400sec. so it should be maybe 2x faster. So to get 20 hours, I am going to guess the old disk had the write cache turned off and the disk working badly, that would explain it being that much slower. It may mean all of the old disk has the write cache on the disk disabled and the new one does not have it disabled, or the hardware raid is more efficiently working with the write cache off with the new disk vs the old disk. Or it could be the write cache is the same and the new disk with new firmware works better with command queuing so wastes less time seeking back and forth. On Tue, Dec 1, 2020 at 11:15 AM Gandalf Corvotempesta wrote: > > Il giorno mar 1 dic 2020 alle ore 14:01 Roger Heflin > ha scritto: > > So what is the model of each disk and how big is the partition used > > for the array on each of the 8 disks? > > Old disk: Seagate ST3600057SS 3.5'' > New disk: Seagate ST600MP0006 2.5'' > > One huge virtual disk, 3271G