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=-6.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 46D20C433DF for ; Sat, 22 Aug 2020 09:38:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2D43A20738 for ; Sat, 22 Aug 2020 09:38:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726920AbgHVJio (ORCPT ); Sat, 22 Aug 2020 05:38:44 -0400 Received: from smtp.hosts.co.uk ([85.233.160.19]:60122 "EHLO smtp.hosts.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725864AbgHVJio (ORCPT ); Sat, 22 Aug 2020 05:38:44 -0400 Received: from host86-157-102-164.range86-157.btcentralplus.com ([86.157.102.164] helo=[192.168.1.64]) by smtp.hosts.co.uk with esmtpa (Exim) (envelope-from ) id 1k9Pyz-0001Ek-59; Sat, 22 Aug 2020 10:38:41 +0100 Subject: Re: Recommended filesystem for RAID 6 To: Peter Grandi , list Linux RAID References: <1381759926.21710099.1597158389614.JavaMail.zimbra@karlsbakk.net> <4a7bfca8-af6e-cbd1-0dc4-feaf1a0288be@fritscher.net> <5F32F56C.7040603@youngman.org.uk> <05661c44-8193-6bba-67c9-4e0d220eb348@suddenlinkmail.com> <24384.51317.30569.169686@cyme.ty.sabi.co.uk> From: Wols Lists Message-ID: <5F40E7A0.8040802@youngman.org.uk> Date: Sat, 22 Aug 2020 10:38:40 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.0 MIME-Version: 1.0 In-Reply-To: <24384.51317.30569.169686@cyme.ty.sabi.co.uk> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-raid-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org On 22/08/20 08:25, Peter Grandi wrote: >>> [...] Note that it IS a shingled drive, so fine for backup, >>> >> much less so for anything else. > It is fine for backup especially if used as a tape that is say > divided into partitions and backup is done using 'dd' (but > careful if using Btrfs) or 'tar' or similar. If using 'rsync' or > similar those still write a lot of inodes and often small files > if they are present in the source. > The idea is an "in place" rsync, with lvm or btrfs or something providing snapshots. That way, I have full backups each of which only takes up the marginal space required by an incremental :-) Cheers, Wol