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 TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by finch.gentoo.org (Postfix) with ESMTPS id 408E0139083 for ; Thu, 7 Dec 2017 21:38:27 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 1F57EE0F8E; Thu, 7 Dec 2017 21:38:21 +0000 (UTC) Received: from mout.gmx.net (mout.gmx.net [212.227.15.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id 6A4D6E0F2E for ; Thu, 7 Dec 2017 21:38:20 +0000 (UTC) Received: from tp ([92.78.149.24]) by mail.gmx.com (mrgmx003 [212.227.17.190]) with ESMTPSA (Nemesis) id 0M1W5x-1fBK6j0BNB-00tX8c for ; Thu, 07 Dec 2017 22:38:08 +0100 Date: Thu, 7 Dec 2017 22:37:55 +0100 From: Frank Steinmetzger To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] OT: btrfs raid 5/6 Message-ID: <20171207213755.GB18433@tp> Mail-Followup-To: gentoo-user@lists.gentoo.org References: <5A218A49.3050004@youngman.org.uk> <20171206232829.GA5249@tp> <20171207001328.GC5249@tp> 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 MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="tjCHc7DPkfUGtrlw" Content-Disposition: inline In-Reply-To: User-Agent: Mutt 1.7.2; VIM - Vi IMproved 8.0 X-Provags-ID: V03:K0:oQq+ysvVOsxNZmDToCsnHOjdw5yOe51ESgMWsTgxkG1tGL/FRh/ Xji/OjbeL1242/Dajufv28qJdxte2F3UfIdh1V+CXQ2EjRQ77YD67VWNeUxWv1ujfiD/5Iq btHCpU1Z1yQyjHlm8sgaYJFAMfFw03Tr+swy7gaxaYdGYNp4S9qg0tCqzGzI0IVeJnXGCa5 kmnHjghX3oqI7xxTM9z+g== X-UI-Out-Filterresults: notjunk:1;V01:K0:EAdXVsF6uco=:ogQ2j1NF93OmHT5kQ7HpfW kRU8IBQ3TiqSwp/LFcNFjACsYpkPNCQJ6KHN2oSKwTpjo6QajCus6N4/UOdpVf4IfWaycfBne R/OE0E3XQ3BcLMXdWv/xg0vcImVUNR0PsjCHlQCONie126hJNgNz0349umshQkMGezBKsDHsF AsQaAy62gOOnDVnetpMuV1x449yRHZMlCMsvmayM8mOnjlfj/UgM/8UceTuh8S6Ku+vRKO+cQ eIw0RNF1q1xq70wMWDYzrQZOQykMZD8xiORydllO4BdK6AvVd/3cSh/JT7A1RsLUeVG5rB5Mf ffkT04hhiZId7gLz09UiklgNz1cDLAefm+cT6IUShtHbRLF0ibqmNeQmvHU31rivebDla/hzY CAAfawd1ZC1bC7c+9JOutmR/0RC1y/2vD++HxvfAAKNo+B313R4OuntB4aZ8e399eQuUW/vyB jvE6LpA0X+ydxM9JDlASkVD8y6iMoy91mPcvJBKw/agyp36NTLKdiosfqXGo4SeuEp1moc3is 4dHxID2irCsk4xJ4uVueEk4dmoNvgqPlnnp68O4Vp69rzIvZN90ik9t/bNh41wuX+bwYTjgeT hEAC9aPMLzE8pHeJb6XUR6NT2I6D1X0NKQei4kFEx2y/CeE6JWAeLMQeo1SI84bAODHp1HJqh llIPQUu3q9tUDNBVBv6hxIbuDlPwGPPHihJYZ4HTNtoOvlU3r0FOEEKfBYQO9+x79QpYc9JDh C5CJVzslW0CBZMbJGXgBiZsStrfFpJO2L8xmXbIFs3ZrcjmZg555g/zBA8/QxqTZ93+QMaE/r OwuY+oQPDPkT3cJE1VH09q+Ws94XIncXsAJ47gOVom2lPex5wk= X-Archives-Salt: 1b79466e-d08e-43d9-8c21-2a9d517e766f X-Archives-Hash: 7e14ccfd9b9d5505573f065d9f757688 --tjCHc7DPkfUGtrlw Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Dec 06, 2017 at 07:29:08PM -0500, Rich Freeman wrote: > On Wed, Dec 6, 2017 at 7:13 PM, Frank Steinmetzger wrote: > > On Wed, Dec 06, 2017 at 06:35:10PM -0500, Rich Freeman wrote: > >> > >> IMO the cost savings for parity RAID trumps everything unless money > >> just isn't a factor. > > > > Cost saving compared to what? In my four-bay-scenario, mirror and raidz2 > > yield the same available space (I hope so). > > >=20 > Sure, if you only have 4 drives and run raid6/z2 then it is no more > efficient than mirroring. That said, it does provide more security > because raidz2 can tolerate the failure of any two disks, while > 2xraid1 or raid10 can tolerate only half of the combinations of two > disks. Ooooh, I just came up with another good reason for raidz over mirror: I don't encrypt my drives because it doesn't hold sensitive stuff. (AFAIK native ZFS encryption is available in Oracle ZFS, so it might eventually come to the Linux world). So in case I ever need to send in a drive for repair/replacement, noone can read from it (or only in tiny bits'n'pieces from a hexdump), because each disk contains a mix of data and parity blocks. I think I'm finally sold. :) And with that, good night. --=20 Gru=C3=9F | Greetings | Qapla=E2=80=99 Please do not share anything from, with or about me on any social network. =E2=80=9CI think Leopard is a much better system [than Windows Vista] =E2= =80=A6 but OS X in some ways is actually worse than Windows to program for. Their file system= is complete and utter crap, which is scary.=E2=80=9D =E2=80=93 Linus Torvalds --tjCHc7DPkfUGtrlw Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEVbE9o2D2lE5fhoVsizG+tUDUMMoFAloptLMACgkQizG+tUDU MMobWg//b8ctL2YfjL9Foe8IQrUZOSLEPkxr7p4+V4LUsMZhYHibCzU4hRFN0C8O mmOAjVFPOjfJZ1mjqNNc4xR4yaffOoR/hL7zY/svQP4hzQIXtLOQqwjK3AmIxKmN zd4CEShy4JrCyEkMdkw0Xahnn+EwwwYDJRb+TKR+87glX2L3Ie2xQaJ266HHkj7c qidm+B7Nlb6Z+2JoWcTSkFxE3B5Ig8Wv0Z9yRo/Cj2txFuPewevFtKWikMUZ2GoM hMNsmPKX4oTgtfAjnqDIb5LGm7Z98gdgCvh/IDRyFbjRqR5+DMFsYdNPH3LU0BN3 I65bPrQjRIg4GwEsPLeDlRL23c9U59/81eoZi31WFjFO+AFFfFaQgmxxxirQwdkw 75NYl5Lqs97EIAI0gZkTgrrsDOR+APIrmvSB3eTawwvuBo7+0ZRZY8O+3GOA12Wn 1w9UcyaNPPS73oK6tUOCQhjmB+AtjQGVlc7GExwwB75pJC14KruALuWUdcBrUcR0 gnR6A95NAr+Stsx0EuyoO5IN0pOPE6VgSTZA+77og0TWF7/HpV/Oqbmg1X916oRB RbNRI1acGr3MuCaEg1e2aALNMxSuUIXHGB6XK6S8ttZwgq5t5HswFGfndTjEYy94 5716O4Hk4dK+Ioup5osgmruXhVzISdylwP2GSM4u9haL2IZnHQk= =Tn7B -----END PGP SIGNATURE----- --tjCHc7DPkfUGtrlw--