From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by finch.gentoo.org (Postfix) with ESMTPS id 7C94F158020 for ; Wed, 21 Dec 2022 21:34:00 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 203ADE086D; Wed, 21 Dec 2022 21:33:55 +0000 (UTC) Received: from smtp.hosts.co.uk (smtp.hosts.co.uk [85.233.160.19]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id DA4D1E0809 for ; Wed, 21 Dec 2022 21:33:54 +0000 (UTC) Received: from host86-138-24-20.range86-138.btcentralplus.com ([86.138.24.20] helo=[192.168.1.65]) by smtp.hosts.co.uk with esmtpa (Exim) (envelope-from ) id 1p86in-0000pQ-47 for gentoo-user@lists.gentoo.org; Wed, 21 Dec 2022 21:33:53 +0000 Message-ID: <7845794c-b567-a4ee-9243-763684fe86c6@youngman.org.uk> Date: Wed, 21 Dec 2022 21:33:53 +0000 Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.6.0 Subject: Re: [gentoo-user] NAS and replacing with larger drives Content-Language: en-GB To: gentoo-user@lists.gentoo.org References: <9407e524-2226-6ba9-dd7f-bac635d083e3@gmail.com> <10b30d8a-5c5d-a80a-e659-b5624e2848e4@gmail.com> <49c8e857-0ed9-0dfd-341b-af955635337c@youngman.org.uk> From: Wol In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Archives-Salt: 0b784b93-b3e7-48f0-8eb3-8ade142ea7d4 X-Archives-Hash: c2f0ea87d861dbb4c540932c062e2451 On 21/12/2022 20:40, Frank Steinmetzger wrote: > Yes? In a mirror setup, all member drives of a mirror have the same content > (at least in ZFS). > > Raid 10 distributes its content across several mirrors. This is the cause > for its increased performance. So when one of the mirrors (not single drive, > but a whole set of mirrored drives) fails, the pool is gone. > >> Linux will happily give you a 2-copy mirror across 3 drives - 3x6TB drives >> will give you 9TB useful storage ... > I admit, I’ve never head of that. (Though it sounds like raid-5 to me.) Raid 5 has a parity drive (or rather, raid 4 has a parity drive. Raid 5 smears parity across all disks). It does not store duplicate copies. Raid 10 has duplicate data and no parity. > Read up on linux raid-10. It is NOT raid-1+0. Drive sda sdb sdc Blocks 1 1 2 2 3 3 4 4 5 5 6 6 etc ... https://raid.wiki.kernel.org/index.php/What_is_RAID_and_why_should_you_want_it%3F (Disclaimer - I either wrote or heavily edited it.) Cheers, Wol