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 us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DCA8EC433F5 for ; Sat, 7 May 2022 21:21:10 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-250-Ea6wLGkPN6agktjRts-q3g-1; Sat, 07 May 2022 17:21:06 -0400 X-MC-Unique: Ea6wLGkPN6agktjRts-q3g-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 80F93185A7B2; Sat, 7 May 2022 21:21:03 +0000 (UTC) Received: from mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (unknown [10.30.29.100]) by smtp.corp.redhat.com (Postfix) with ESMTP id F28031544F20; Sat, 7 May 2022 21:20:58 +0000 (UTC) Received: from mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (localhost [IPv6:::1]) by mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (Postfix) with ESMTP id CCEAD194705D; Sat, 7 May 2022 21:20:58 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) by mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (Postfix) with ESMTP id 626B1194705A for ; Sat, 7 May 2022 21:20:57 +0000 (UTC) Received: by smtp.corp.redhat.com (Postfix) id 0D9F0C3598C; Sat, 7 May 2022 21:20:57 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast09.extmail.prod.ext.rdu2.redhat.com [10.11.55.25]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0A2BFC3598B for ; Sat, 7 May 2022 21:20:56 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E006F294EDC8 for ; Sat, 7 May 2022 21:20:56 +0000 (UTC) Received: from mail.gathman.org (mail.gathman.org [70.184.247.44]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-613-mFOOaV9eObumjMoB0saegQ-1; Sat, 07 May 2022 17:20:52 -0400 X-MC-Unique: mFOOaV9eObumjMoB0saegQ-1 Received: from mail.gathman.org (mail.gathman.org [IPv6:2001:470:8:809::1010]) (authenticated bits=0) by mail.gathman.org (8.14.7/8.14.7) with ESMTP id 247KfCim004351 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Sat, 7 May 2022 16:41:12 -0400 Date: Sat, 7 May 2022 16:41:12 -0400 (EDT) From: Stuart D Gathman To: LVM general discussion and development In-Reply-To: <87561BC7-DDA5-4BC9-9F98-17118199E96D@icloud.com> Message-ID: <6d72d74a-98cc-b055-d1ba-bcd20201e67@gathman.org> References: <7534073B-7DBD-46B5-9CA5-BFB3C603C75E@icloud.com> <25199.10122.376547.499176@quad.stoffel.home> <324D8F25-90D3-4165-BE86-11B217DAFDE4@icloud.com> <25200.21283.981034.416787@quad.stoffel.home> <87561BC7-DDA5-4BC9-9F98-17118199E96D@icloud.com> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.85 on 10.11.54.8 Subject: Re: [linux-lvm] Bypassing LVM Restrictions - RAID6 With Less Than 5 Disks X-BeenThere: linux-lvm@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: LVM general discussion and development Errors-To: linux-lvm-bounces@redhat.com Sender: "linux-lvm" X-Scanned-By: MIMEDefang 2.85 on 10.11.54.7 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=linux-lvm-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/mixed; boundary="-1203360521-1701871415-1651956072=:4241" This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. ---1203360521-1701871415-1651956072=:4241 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by mail.gathman.org id 247KfCim004351 On Fri, 6 May 2022, Alex Lieflander wrote: > Thanks. I really don=E2=80=99t want to give up the DM-Integrity managemen= t. Less complexity is just a bonus. What are you trying to get out of RAID6? If redundancy and integrity are already managed at another layer, then just use RAID0 for striping. I like to use RAID10 for mirror + striping, but I understand parity disks= =20 give redundancy without halving capacity. Parity means RMW cycles of largish blocks, whereas straight mirroring (RAID1, RAID10) can write single sectors without a RMW cycle. ---1203360521-1701871415-1651956072=:4241 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://listman.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ ---1203360521-1701871415-1651956072=:4241--