From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1RVTIv-0008Ke-AK for garchives@archives.gentoo.org; Tue, 29 Nov 2011 19:25:21 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id D340521C164; Tue, 29 Nov 2011 19:25:06 +0000 (UTC) Received: from out3.smtp.messagingengine.com (out3.smtp.messagingengine.com [66.111.4.27]) by pigeon.gentoo.org (Postfix) with ESMTP id E937B21C143 for ; Tue, 29 Nov 2011 19:23:44 +0000 (UTC) Received: from compute3.internal (compute3.nyi.mail.srv.osa [10.202.2.43]) by gateway1.nyi.mail.srv.osa (Postfix) with ESMTP id A41CD23544 for ; Tue, 29 Nov 2011 14:23:44 -0500 (EST) Received: from frontend2.nyi.mail.srv.osa ([10.202.2.161]) by compute3.internal (MEProxy); Tue, 29 Nov 2011 14:23:44 -0500 DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d=binarywings.net; h=message-id:date:from:mime-version:to:subject:references :in-reply-to:content-type; s=mesmtp; bh=EitBOy2LZczOQKMvrwyfQH/j Ahk=; b=RPp+SJVKEsOQjhq7lrRCD1pHB5JVNG3t0qOQO1p2ltUUgPtoCIXPZRgt eER2kcaoAcG8rnLIqPa3iRXxtVKITV0My6I4JjOfdnlcE5sk1cxw1YfP5ibWezJR NM+CGQeWtnUtLWvgtT6S/JdUToh9IZeO42VrJCSvBHswxeWG1rs= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d= messagingengine.com; h=message-id:date:from:mime-version:to :subject:references:in-reply-to:content-type; s=smtpout; bh=EitB Oy2LZczOQKMvrwyfQH/jAhk=; b=LnmcOnKTTUIf+cHcg+n1H+fDXoOiFo+yPU7x 25iLF6CpWkryFTnT7VL28XjaBSUJdFawlEe4dPmtH6wQf1fTQmIyXYEYciZM/1iA BcGccVrVaJbWXUWKfabZ126HalXJ92QRggEBWqRjCuotFIo0K/H3E72Xe2f/Q5s7 xjgolnc= X-Sasl-enc: hFWMlwzx629Ei6wbqRcozlW8/I9jIqQRMa87j7JFPNMV 1322594622 Received: from [192.168.5.18] (serv.binarywings.net [83.169.5.6]) by mail.messagingengine.com (Postfix) with ESMTPSA id 018A2482485 for ; Tue, 29 Nov 2011 14:23:38 -0500 (EST) Message-ID: <4ED53120.2030209@binarywings.net> Date: Tue, 29 Nov 2011 20:23:12 +0100 From: Florian Philipp User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20111031 Thunderbird/7.0.1 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 To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] dmraid, mdraid, lvm, btrfs, what? References: <4ED484B5.4030700@binarywings.net> <4ED52277.4060304@binarywings.net> In-Reply-To: X-Enigmail-Version: 1.4a1pre Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig21C5603688407A1B594971D1" X-Archives-Salt: ace1e796-1af5-41dc-a3fd-4599a4e2c0a6 X-Archives-Hash: a2144851bf3f4bdb132010ab748da3ed This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig21C5603688407A1B594971D1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Am 29.11.2011 19:39, schrieb Michael Mol: > On Tue, Nov 29, 2011 at 1:20 PM, Florian Philipp wrote: >> Am 29.11.2011 14:44, schrieb Michael Mol: >>> On Tue, Nov 29, 2011 at 2:07 AM, Florian Philipp wrote: >>>> Am 29.11.2011 05:10, schrieb Michael Mol: >>>>> I've got four 750GB drives in addition to the installed system driv= e. >>>>> >>>>> I'd like to aggregate them and split them into a few volumes. My fi= rst >>>>> inclination would be to raid them and drop lvm on top. I know lvm = well >>>>> enough, but I don't remember md that well. >>>>> >>>>> Since I don't recall md well, and this isn't urgent, I figure I can= look >>>>> at the options. >>>>> [...] >>>> What kind of RAID level do you want to use, 10 or 5? You >>>> can also split it: Use a smaller RAID 10 for performance-critical >>>> partitions like /usr and the more space-efficient RAID 5 for bulk li= ke >>>> videos. You can handle this with one LVM volume group consisting of = two >>>> physical volumes. Then you can decide on a per-logical-volume basis >>>> where it should allocate space and also migrate LVs between the two = PVs. >>> >>> Since I've got four disks for the pool, I was thinking raid10 with lv= m >>> on top, and a single lvm pv above that. >>> >> >> Yeah, that would also be my recommendation. But if storage efficiency = is >> more relevant, RAID-5 with 4 disks brings you 750GB more usable storag= e. >> >> >=20 > It looks like I'll want to try two different configurations. RAID5 and > RAID10. Not for different storage requirements, but I want to see > exactly what the performance drop is. >=20 > I wish lvm striping supported data redundancy. But, then, I wish btrfs > was ready... >=20 Just out of curiosity: What happens if you do `lvcreate --mirrors 1 --stripes 2 ...`? Does it create something similar to a RAID-10 or does it simply fail? Regards, Florian Philipp --------------enig21C5603688407A1B594971D1 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk7VMSgACgkQqs4uOUlOuU9oLgCcD6iy3Ej4bzjm/4cm3M6cEwqf nVoAn03g0qggWESxANKG9DN2n6L6E7WG =B6lK -----END PGP SIGNATURE----- --------------enig21C5603688407A1B594971D1--