From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <199907011150.AA23766@mailgate1b.telekom.de> From: Heinz Mauelshagen Subject: Re: [linux-lvm] vgscan -- invalid i/o protocol version Date: Thu, 01 Jul 1999 13:46:55 METDST In-Reply-To: ; from "James Pattinson" at Jul 1, 99 10:17 am Sender: owner-linux-lvm Errors-To: owner-linux-lvm List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: James Pattinson Cc: mge@u9ete.ez-darmstadt.telekom.de, linux-lvm@msede.com > > That's exactly the problem. In fact I found out that was the problem after > I sent the mail by looking at the output from `strace vgscan' but I > couldn't find the require major and minor numbers for the device file > anywhere in the docs. The patch lvm_0.6-patch-15031999a.gz (sorry for my typo in my previous mail :*( ) is needed to take care of automatic creation of the /dev/lvm special. > > I'm a bit stumped for now though as I don't have any spare partitions > (yet) - I tried to be cunning with loopback devices but it doesn't seem to > work: > > [root@fuse /root]# dd if=/dev/zero bs=1024k count=32 of=loop1 > [root@fuse /root]# dd if=/dev/zero bs=1024k count=32 of=loop2 > [root@fuse /root]# dd if=/dev/zero bs=1024k count=32 of=loop3 > [root@fuse /root]# losetup /dev/loop1 loop1 > [root@fuse /root]# losetup /dev/loop2 loop2 > [root@fuse /root]# losetup /dev/loop3 loop3 > [root@fuse /root]# pvcreate /dev/loop1 /dev/loop2 /dev/loop3 > pvcreate -- invalid physical volume name "/dev/loop1" > pvcreate -- invalid physical volume name "/dev/loop2" > pvcreate -- invalid physical volume name "/dev/loop3" > > Is there any way I can bodge it like this to try it out? Sorry, no loop device support with 0.6. It will be in 0.7 as an evaluation support for people who don't have lots of disk partitions to play with. I should better throw out 0.7 soon 8*))) > > One more thing - I am a big fan of the raid patches that allow you to > autodetect raid partitions on boot - currently my machine has it's root > partition striped across two disks. What is the striping like on LVM? Is > it feasible to boot from an LVM? > That's one issue i'm working on with 0.7 right know. After i asked for input of people who claimed already to be able to have root in a LV but never got a return i wanted to bring support with 0.7. Maybe i better release 0.7 and give that support later?! It bassically works like this: LILO -> INITRD (in very small partition) -> activate volume groups -> change root to root LV -> copy /etc/lcmtab* to real LV root -> start as usual The INITRD only contains some needed executables, shared libraries, dirs and /linuxrc. Regards, Heinz > Cheers, > > James > > On Wed, 30 Jun 1999, Michael Marxmeier wrote: > > > > so i ran vgscan and got the message in the subject line. It's possible I'm > > > being really thick and I don't really know what I'm doing. Do I need the > > > devfs patches too? > > > > AFAIR this error message has appeared previously when the /dev/lvm > > device file was missing. > > > -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Systemmanagement C/S Deutsche Telekom AG Entwicklungszentrum Darmstadt Heinz Mauelshagen Otto-Roehm-Strasse 71c Senior Systems Engineer Postfach 10 05 41 64205 Darmstadt mge@ez-darmstadt.telekom.de Germany +49 6151 886-425 FAX-386 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-