From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx3.redhat.com (mx3.redhat.com [172.16.48.32]) by int-mx1.corp.redhat.com (8.11.6/8.11.6) with ESMTP id i9VGn8r16307 for ; Sun, 31 Oct 2004 11:49:08 -0500 Received: from server6.hostpoint.ch (server6.hostpoint.ch [217.26.52.16]) by mx3.redhat.com (8.12.11/8.12.11) with ESMTP id i9VGn20C017293 for ; Sun, 31 Oct 2004 11:49:03 -0500 Received: from 217-119-145-4.sefanet.ch ([217.119.145.4] helo=[192.168.15.41]) by server6.hostpoint.ch with asmtp (Exim 4.34) id 1COIsx-0004x2-5V for linux-lvm@redhat.com; Sun, 31 Oct 2004 17:48:55 +0100 Message-ID: <41851771.4060203@markus.org> Date: Sun, 31 Oct 2004 17:48:49 +0100 From: Markus Baertschi MIME-Version: 1.0 Subject: Re: [linux-lvm] Software raid on top of lvm logical volume References: <41801ADE.6030308@monjoin.net> <20041028011738.GD13737@kluge.net> <41814060.4040400@mikebabcock.ca> In-Reply-To: <41814060.4040400@mikebabcock.ca> Content-Transfer-Encoding: quoted-printable Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="iso-8859-1"; format="flowed" To: LVM general discussion and development Michael T. Babcock wrote: > > I've thought about this numerous times -- there is the distinct=20 > resizing advantage. Namely, if I create a software RAID partition, I=20 > can't resize it afterward without destroying it. I have for example,=20 > on occasion, had three disks set up where 1/3 of each was devoted to a=20 > RAID-0 very fast striping set for data transfers that had to be fast=20 > but if they were lost it wasn't critical, and 2/3 was set up as RAID-5=20 > for reliability of another set of data. > > I understand this may not be optimal in some situations, but some of=20 > us don't have thousands of dollars for SCSI HW RAID controllers. You can make life easier by creating several raid arrays on the same=20 disks and tie them together with LVM. For example split your three 160GB drives into 4 partitions each and=20 create a raid over the three disks. sda -> sda1+sda2+sda3+sda4, etc. md0 =3D sda1+sdb1+sdc1, md1=3Dsda2+sdb2+sdc2, etc. Markus --=20 Markus Baertschi Phone: ++41 (21) 807 1677 Bas du Ross=EF=BF=BD 14b Fax : ++41 (21) 807 1678 CH-1163, Etoy Email: markus@markus.org Switzerland Homepage: www.markus.org