"Canek Peláez Valdés" <can...@gmail.com> wrote: >On Thu, Aug 29, 2013 at 10:47 AM, <gottl...@nyu.edu> wrote: >> I want to reinstall an old system to have combined root+usr. >> >> I have always used an lvm installation guide that was a "companion" >to >> the handbook. That is it would tell you how to augment each handbook >> installation chapter for lvm (actually lvm2). >> >> I can't find this documentation now on gentoo.org. There is a big >wiki >> page, but that is different as are daniel's 2-volume "learning linux >> lvm". >> >> The closest I found is the raid+lvm quick install guide, but i would >be >> happier with the one I have used often in the past. >> >> Any clues (I am emotionally prepared to learn that it is right there >on >> the installation web page, but my eyes and search commands are >> deficient). > >As James said, the docs are being reorganized. However, I did a >systemd+LVM installation (just because I was getting tired of not >knowing what the fuss was all about), and (in my experience) there are >almost no changes from the regular installation in the handbook. > >I put everything in LVM (/, /boot, everything). From my notes, the >only changes are: > >From the livecd: >1. Use partitions, not whole disks (GRUB2 got confused when I tried to >use whole disks). >2. Set the partition type as LVM (8e in fdisk). >3. Create the Physical Volume, the Volume Group, and the Logical >Volumes as desired. >4. Continue the normal installation, just using /dev/vg0/lvolX (or >whatever names you choose). > >After the chroot and emerging the kernel package: >1. Se the LVM options in the kernel. Compile, install it. >2. Emerge systemd. >3. Emerge dracut (USE="device-mapper", DRACUT_MODULES="systemd lvm", at >least). >4. Set add_dracutmodules="systemd" in /etc/dracut.conf. >5. Weirdly, set lvmconf="no" in /etc/dracut.conf. I didn't even >touched /etc/lvm/lvm.conf, so I think leaving it out makes dracut to >autoconfigure it. If I put lvmconf="yes", the boot hangs. Didn't >investigated why. >6. Emerge GRUB2 (USE="device-mapper mount"); I don't know if GRUB >works with LVM, but GRUB2 does, so I used that. >7. Set GRUB_PRELOAD_MODULES="lvm", >GRUB_CMDLINE_LINUX="init=/usr/lib/systemd/systemd", in >/etc/default/grub. >8. Generate initramfs, generate /boot/grub2/grub.cfg, install GRUB2 >with grub2-install. >9. Reboot. Everything works. > >GRUB2 handles LVM just fine, I believe, but my LVM setup was dead >simple (the VG was just the only partition of all my disks). >dracut+systemd takes care of everything else; I didn't even had to do >something special in fstab, since I used labels. > >To extend/reduce your Logical Volumes you will need a livecd, or a >more complex initramfs, though. > >Regards.
Canek, LVs can be resized while the system is running. It also depends on the actual filesystem, but extending can be done online with all filesystems I am aware of. Shrinking is not possible with all. -- Joost -- Sent from my Android device with K-9 Mail. Please excuse my brevity. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
