From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <3A63F53F.BA790549@lxco.com> Date: Tue, 16 Jan 2001 08:16:15 +0100 From: =?iso-8859-1?Q?J=FCrgen?= Frank MIME-Version: 1.0 Subject: Re: [linux-lvm] how can I init LVM on software RAID ? References: <3A5EE491.5E4FB886@lxco.com> <3A5F1C1A.5D9C8CE4@symbionsys.com> <3A5F1E6C.CD1D1A3E@lxco.com> <3A5F27F0.1090002@liberate.com> Content-Transfer-Encoding: quoted-printable Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: List-Id: Content-Type: text/plain; charset="iso-8859-1" To: Chris Worley , LVM Hi everyone, Hi Chris = ok, I think I have a little solution for my problem with the LVM over SoftwareRaid. It's seems to = work with the new beta version (sorry I don't try the patch for the 0.9). = So we have only one little problem, if we boot our system the raid1 (mirror)-system don't start correctly. (on off the mirror disk isn't running). In that case the lvm don't start too !? But I think that's more a problem of the SoftwareRaid , possible it's a hardware failure of the disk or the disk have a very high startup time. But I don't understand why lvm don't startup, normally this is a = transparenc fault , or ? byebye Juergen >Chris Worley wrote: > = > J=FCrgen, > = > You are correct. That is a very good question (and valid for this > newsgroup). I don't have an answer. I've seen the documentation that > says you can make raid 10 & 50 (etc...) by mixing MD's under PV's, as > well as making VG's out of LVM's (but why?). I've also seen errors if > I haven't set my PV's partition to 8e... and there's no way to fdisk > an MD (to set the partition type). I would worry about the > performance of two layers of software overhead below the file system. > = > I had barely crawled out of bed when I saw your post and thought "I > can help a newbie". This is not a trivial question, I was wrong ;) > = > Chris > = > J=FCrgen Frank wrote: > = > > Chris Worley wrote: > > > >> J=FCrgen, > >> > >> "md" and "lvm" are two different ways of making a software raid. > >> > >> lvm only does raid0. The main purpose of LVM is to allow you to man= age > >> disks underneath the file system... adding and removing disks > >> dynamically. > >> > > > > > > Jep, that's the point why I want to use this two systems. So I want t= o > > create a RAID 1 / 5 system and on the top I put the LVM. With this > > method I have a good system with snapshot and enlargment feature !!! > > And if I read all the docu (the howto, the pdf from sistina) lvm work= s > > fine with the md - drives. But, that is the point which I can't follo= w > > in the moment. Because I can't make partitions on a md drive and LVM > > need this partitions ... > > > > > > > > > >> There should be HOWTO's for md in your /usr/doc area. The LVM newsg= roup > >> is not a good place to ask MD related questions. There are a few > >> "howto's" for LVM: > >> > >> http://www.sistina.com/lvm/Pages/howto.html > >> > >> I like: > >> > >> http://www.ds9a.nl/lvm-howto/HOWTO//cvs/lvm-howto/lvm-howto.html > >> > >> Chris > >> > > > > > > I read all this docu, but I can't find any help for a system LVM over= > > MD-Drives (Software RAID) !!! > > > > > > Juergen > > > > > >> J=FCrgen Frank wrote: > >> > >>> Hi !! > >>> > >>> I want to create the following system : > >>> > >>> I use the new kernel (2.4) and I want to use the software raid and = the > >>> lvm, > >>> but my problem is... how ? > >>> > >>> I can't find a step by step documentation and all what I try don't = work. > >>> > >>> So what did I done : > >>> > >>> * create a mirror system with software raid (last version), after t= his > >>> step I have a good raid system with the drive /dev/md0 > >>> > >>> * normally now I need to create a partition on the drive , but I re= ad in > >>> the raid docu that the md-drives don't support partitions !!! > >>> > >>> But, without a partiton of the type 0x8e I can't run vgscan and > >>> pvcreate... > >>> > >>> So, can anyone help me ?! > >>> > >>> Juergen > >>> > >>> (sorry for the bad english) > >>> _______________________________________________ > >>> linux-lvm mailing list > >>> linux-lvm@sistina.com > >>> http://lists.sistina.com/mailman/listinfo/linux-lvm > >>