A few notes I missed: This ramdisk I made myself. You can mount it on loopback after untarring it to examine it's contents. It's size sould be set to 8192. Regards, --Neil. ----- Original Message ----- From: "Neil Macvicar" <neilm@foobarhouse.com> To: <linux-lvm@sistina.com> Sent: Thursday, September 13, 2001 1:15 PM Subject: Re: [linux-lvm] How to boot with LVM? > If it's any help, I have put my initrd on public ftp at > fruits.foobarhouse.com in the LVM directory. It's served me well for as long > as I've been using LVM'ed root. > > I'm currently using LVM 0.9.1beta8. > > Regards, > --Neil. > > ----- Original Message ----- > From: "A.R. (Tom) Peters" <tpeters@xs4all.nl> > To: <linux-lvm@sistina.com> > Sent: Thursday, September 13, 2001 8:18 AM > Subject: [linux-lvm] How to boot with LVM? > > > > I bought a 30 GB HD, and decided to put it under the LVM and put > > ReiserFS on it. I managed to initialize it fine, and it now has a base > > Debian install on it, but I cannot manage to boot from it. > > > > You cannot boot from a LV; therefore I made a small (16 MB) ext2 > > partition with a kernel and an initrd. My intended root FS is on a LV, > > and you need to jump through some hoops to get the kernel mount it on / > > : that is documented in the LVM-HOWTO and FAQ that comes with the LVM > > tools. Use of initrd is documented in > > /usr/src/linux/Documents/initrd.txt . Finally, the Bootdisk-HOWTO > > helps. > > > > I use LVM tools 1.0.1-rc2, and a 2.4.10-pre7 kernel, patched with the > > patches of the LVM tools; no .rej there. I compiled the LVM binaries > > with liblvm-10 statically linked, because otherwise the executables in > > the initrd had problems with finding the .so (I think I know what was > > going on, but won't go into that now). Therefore I have to make a > > Ramdisk of 5MB instead of the default 4 MB. > > > > My new HD is /dev/hdd, and is the 3rd HD in the system: this allows me > > to still use my computer to read docs and send you this message. So for > > now I do not want to put a bootloader on the disk because the hardware > > config is going to change: instead I use a boot floppy with GRUB. > > > > LVM has a utility script lvmcreate_initrd to make an initrd suitable to > > prepare for mounting a LV on / . > > > > The system boots with the floppy; the correct kernel is loaded from the > > ext2 partition, as well as the initrd; the LVM tools on the initrd are > > executed and seem to work properly. > > > > PROBLEM: subsequently the kernel panics because it still cannot mount a > > root. > > > > I got a GRUB bootdisk that works. /grub/menu.lst : > > title Linux24 > > root (hd2,4) > > kernel /vmlinuz-2.4.10-pre7 root=/dev/SYSDISK/Root ramdisk_size=5120 > > # If I specify root=/dev/ram0 then I get a shell on the rudimentary > > initrd system. > > initrd /initrd-lvm-2.4.10-pre7.gz > > > > On initrd: > > > > etc/fstab: > > /dev/ram / ext2 defaults 0 0 > > proc /proc proc defaults 0 0 > > > > linuxrc: > > #!/bin/sh > > /bin/mount /proc > > /sbin/vgscan > > /sbin/vgchange -a y > > /bin/umount /proc > > > > devices: > > # ls -l dev/SYSDISK/ > > total 0 > > brw-rw---- 1 root disk 58, 2 Sep 11 19:23 Opt > > brw-rw---- 1 root disk 58, 0 Sep 11 19:23 Root > > brw-rw---- 1 root disk 58, 4 Sep 11 19:23 Scratch > > brw-rw---- 1 root disk 58, 1 Sep 11 19:23 Usr > > brw-rw---- 1 root disk 58, 3 Sep 11 19:23 Var > > crw-r----- 1 root disk 109, 0 Sep 11 19:23 group > > > > Kernel: > > # rdev vmlinuz-2.4.10-pre7 > > Root device /dev/ram0 # Root device /dev/SYSDISK/Root > > (-> 0x3a00) does not make a difference > > # rdev -R vmlinuz-2.4.10-pre7 > > Root flags 0 # i.e. mount ro > > # rdev -r vmlinuz-2.4.10-pre7 > > Ramsize 49152 # i.e. offset=0; bit14=1: load ramdisk; bit15=1: > > # prompt before loading rootfs - this never happens! > > > > What am I supposed to change? The kernel initrd.txt has a long and > > complicated story on using pivot_root to switch rootfs, but apparently > > the LVM linuxrc relies on the deprecated method that does this > > automatically. > > > > Any advice welcome. > > > > -- > > > #>!$!%(@^%#%*(&(#@#*$^@^$##*#@&(%)@**$!(&!^(#((#&%!)%*@)(&$($$%(@#)&*!^$)^@* > ^@) > > > > Tom "thriving on chaos" Peters > > NL-1062 KD nr 149 tel. +31-204080204 > > Amsterdam e-mail tpeters@xs4all.nl > > > > > > _______________________________________________ > > linux-lvm mailing list > > linux-lvm@sistina.com > > http://lists.sistina.com/mailman/listinfo/linux-lvm > > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@sistina.com > http://lists.sistina.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
