From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) (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 lists.proxmox.com (Postfix) with ESMTPS id 1E69C651F3 for ; Wed, 22 Jul 2020 12:46:01 +0200 (CEST) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 0AD511FA42 for ; Wed, 22 Jul 2020 12:45:31 +0200 (CEST) Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com [212.186.127.180]) (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 firstgate.proxmox.com (Proxmox) with ESMTPS id 645831FA33 for ; Wed, 22 Jul 2020 12:45:29 +0200 (CEST) Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id 25E4A43311 for ; Wed, 22 Jul 2020 12:45:29 +0200 (CEST) To: Proxmox VE development discussion , Aaron Lauterer References: <20200721125829.23083-1-a.lauterer@proxmox.com> From: Thomas Lamprecht Message-ID: <2c87bf19-afe1-f857-c296-7dce2d16ed6e@proxmox.com> Date: Wed, 22 Jul 2020 12:45:28 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:79.0) Gecko/20100101 Thunderbird/79.0 MIME-Version: 1.0 In-Reply-To: <20200721125829.23083-1-a.lauterer@proxmox.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-SPAM-LEVEL: Spam detection results: 0 AWL 0.008 Adjusted score from AWL reputation of From: address KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment RCVD_IN_DNSWL_MED -2.3 Sender listed at https://www.dnswl.org/, medium trust SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record URIBL_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to URIBL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information. [proxmox.com] Subject: [pve-devel] applied: [PATCH docs v1] Add section with more infos about ZFS RAID levels X-BeenThere: pve-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox VE development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Jul 2020 10:46:01 -0000 On 21.07.20 14:58, Aaron Lauterer wrote: > This new section explains the performance and failure properties of > mirror and RAIDZ VDEVs as well as the "unexpected" higher space usage by > ZVOLs on a RAIDZ. > > Signed-off-by: Aaron Lauterer > --- > > draft->v1: > * incorporate Stoikos suggestions [0] > * went with lower case vdev as this is the way it is used in the zpool > manpage > * used N-P(arity) in the RAIDZ sizing part > * added a short explanation of vdevs at the beginning and mention the > zpool manpage > > > This is a first version to explain the performance characteristics of the > different RAID levels / vdev types, as well as their failure behavior. > > Additionally it explains the situation why a VM disk (ZVOL) can end up > using quite a bit more space than expected when placed on a pool made of > RAIDZ VDEVs. > > The motivation behind this is, that in the recent past, these things > came up quite a bit. Thus it would be nice to have some documentation > that we can link to and having it in the docs might help users to make > an informed decision from the start. > > I hope I did not mess up any technical details and that it is > understandable enough. > > [0] https://lists.proxmox.com/pipermail/pve-devel/2020-July/044453.html > > local-zfs.adoc | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 95 insertions(+) > > applied, thanks!