From owner-freebsd-questions@FreeBSD.ORG Fri Mar 5 05:04:03 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5014C16A4CE for ; Fri, 5 Mar 2004 05:04:03 -0800 (PST) Received: from deluge.umist.ac.uk (deluge.umist.ac.uk [130.88.120.66]) by mx1.FreeBSD.org (Postfix) with ESMTP id C891143D31 for ; Fri, 5 Mar 2004 05:04:02 -0800 (PST) (envelope-from lewiz@black.lewiz.org) Received: from lh014.halls.umist.ac.uk ([130.88.163.14] helo=yellow.lewiz.org) by deluge.umist.ac.uk with esmtp (Exim 4.24) id 1AzEzh-0003kS-OH; Fri, 05 Mar 2004 13:04:01 +0000 Received: from black.lewiz.org ([192.168.0.13]) by mail.lewiz.org with smtp (Exim 4.30; FreeBSD) id 1AzEzi-0005fX-PO; Fri, 05 Mar 2004 13:04:02 +0000 Received: (nullmailer pid 1562 invoked by uid 4001); Fri, 05 Mar 2004 13:03:55 -0000 Date: Fri, 5 Mar 2004 13:03:55 +0000 From: Lewis Thompson To: Tony Frank Message-ID: <20040305130354.GB1458@lewiz.org> References: <20040226141514.GA32107@lewiz.org> <20040305122817.GA2655@marvin.home.local> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Pd0ReVV5GZGQvF3a" Content-Disposition: inline In-Reply-To: <20040305122817.GA2655@marvin.home.local> X-GPG-Fingerprint: 90A4 939E 3847 A3E4 8103 2A48 22DA B428 542F ED3F X-GPG-Info: http://www.lewiz.org/~lewiz/pgpkey / horowitz.surfnet.nl User-Agent: Mutt/1.5.6i X-MailScanner-Information: Please contact the ISP for more information X-MailScanner: Found to be clean cc: FreeBSD-questions Subject: Re: Growing RAID5 (using RAID0). X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Mar 2004 13:04:03 -0000 --Pd0ReVV5GZGQvF3a Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Mar 05, 2004 at 11:28:17PM +1100, Tony Frank wrote: > On Thu, Feb 26, 2004 at 02:15:14PM +0000, Lewis Thompson wrote: > > i.e. can I create a RAID0 volume from two RAID5 volumes? > > I understand this might sound a little odd but if it works it would be > > the ideal solution for me. I would also be interested in hearing how > > other people might have overcome this problem of growing a large RAID5 > > volume. >=20 > As you didnt post anything about your implementation I can only guess. > If you are using hardware raid5 for each disk set and it cannot do raid0= =20 > on top you could look at using software raid0 to join the two hardware > sets. Eg vinum can do raid0 in software over raid5 in hardware. > =20 > If you are doing this purely in software it will depend on what software > you use. If using vinum I believe you can only mirror across two (or mor= e) > raid5 plexes, so probably not what you want to do. Yes. I forgot to specify but this was going to be purely software RAID. I've recently had a little trouble buying a hardware ATA raid card (I was shipped an incorrect model and lost out about GBP 100!) so until then I'm software only. I looked at (I think) raidframe (?) and this /appeared/ to support this functionality but I wasn't sure if it was something Vinum was also able to do. It seems you have clarified this for me. Thanks a lot! -lewiz. --=20 I was so much older then, I'm younger than that now. --Bob Dylan, 1964. ------------------------------------------------------------------------ -| msn:purple@lewiz.net | jabber:lewiz@jabber.org | url:www.lewiz.org |- --Pd0ReVV5GZGQvF3a Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFASHq6Itq0KFQv7T8RAiprAKC/8aPvSCfQpjfRtMaxundseuS5JQCgykKN 3Co/7bU6aw0cjwqdAq9uRgg= =k5fF -----END PGP SIGNATURE----- --Pd0ReVV5GZGQvF3a--