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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 25281C433E1 for ; Sat, 22 Aug 2020 19:54:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EB93F2075E for ; Sat, 22 Aug 2020 19:54:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728674AbgHVTyV (ORCPT ); Sat, 22 Aug 2020 15:54:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34772 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728654AbgHVTyV (ORCPT ); Sat, 22 Aug 2020 15:54:21 -0400 Received: from smtp.domeneshop.no (smtp.domeneshop.no [IPv6:2a01:5b40:0:3005::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED1D2C061573 for ; Sat, 22 Aug 2020 12:54:20 -0700 (PDT) Received: from cm-46.212.141.180.getinternet.no ([46.212.141.180]:43102 helo=olstad.com) by smtp.domeneshop.no with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1k9Zag-0000Aq-6T; Sat, 22 Aug 2020 21:54:14 +0200 Date: Sat, 22 Aug 2020 21:54:12 +0200 From: Kai Stian Olstad To: Chris Murphy Cc: Wols Lists , Linux-RAID Subject: Re: Recommended filesystem for RAID 6 Message-ID: <20200822195412.2rtcwh2zfsj72ja2@olstad.com> References: <1381759926.21710099.1597158389614.JavaMail.zimbra@karlsbakk.net> <4a7bfca8-af6e-cbd1-0dc4-feaf1a0288be@fritscher.net> <5F32F56C.7040603@youngman.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-raid-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org On Sat, Aug 22, 2020 at 12:50:50PM -0600, Chris Murphy wrote: > On Tue, Aug 11, 2020 at 1:47 PM Wols Lists wrote: > > > > On 11/08/20 20:19, Michael Fritscher wrote: > > > Hi, > > > > > > if you really want to use these tiny 2 TB HDDs - yes, RAID 6 (2x - the > > > second for the backup system on a physically different location) is a > > > good choice. > > > > > > But: If you can, buy some 8-12 TB HDDs and forget the old rusty tiny > > > HDDs. You'll save a lot at the system - and power. > > > > > I'm looking at one of these ... > > https://www.amazon.co.uk/Seagate-ST8000DM004-Barracuda-internal-Silver/dp/B075WYBQXJ/ref=pd_ybh_a_8?_encoding=UTF8&psc=1&refRID=WF1CTS2K9RWY96D1RENJ > > > > Note that it IS a shingled drive, so fine for backup, much less so for > > anything else. > > How can you tell? From the spec, I can't find anything that indicates > it. Let alone which of three varieties it is. > https://www.seagate.com/www-content/product-content/barracuda-fam/barracuda-new/en-us/docs/100805918d.pdf You can't from the spec[1], but you have this one[2] in the wake of WD Red started to use SMR without telling anyone. [1] https://blocksandfiles.com/2020/04/15/seagate-2-4-and-8tb-barracuda-and-desktop-hdd-smr/ [2] https://www.seagate.com/gb/en/internal-hard-drives/cmr-smr-list/ -- Kai Stian Olstad PS: Sorry Chris, you get this twice, I forgot reply-to-all.