I recently discovered that the current version of device-mapper and lvm2 included with generkenl for the initramfs doesn't work correctly for virtio blocks. The current stable versions of either package (sys-fs/device-mapper-1.02.24-r1 & sys-fs/lvm2-2.02.36) appear to work great and have the additional support for the virtio block devices. The current version will fail to scan the block device and thus, you can't run an LVM root using virtio currently with genkernel. I simply pulled the latest tarballs and bumped the version in genkernel.conf without any issues. You need to upgrade both in order for this fix to happen. I can provide a patch for the ebuild, but its pretty trivial ;) Thanks! Reproducible: Always
genkernel: bump
I ran into this too. I'm trying to simulate setting up a Gentoo system with 4 disks, each set of 2 disks set up in a software RAID1, with the /boot on an md device and the remainder of the RAID1 devices in a volume group, from which I parse out the root filesystem, etc. Like this: (chroot) livecd home # cat /proc/mdstat Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md1 : active raid1 vda1[0] vdb1[1] 97664 blocks [2/2] [UU] md2 : active raid1 vda3[0] vdb3[1] 25139456 blocks [2/2] [UU] md3 : active raid1 vdc1[0] vdd1[1] 26213952 blocks [2/2] [UU] unused devices: <none> (chroot) livecd home # pvscan PV /dev/md2 VG vg lvm2 [23.97 GiB / 8.97 GiB free] PV /dev/md3 VG vg lvm2 [25.00 GiB / 3.00 GiB free] Total: 2 [48.97 GiB] / in use: 2 [48.97 GiB] / in no VG: 0 [0 ] And so, the set of filesystems, including /, are: /dev/mapper/vg-root 2064208 311096 1648256 16% / /dev/md1 94567 9666 80018 11% /boot /dev/mapper/vg-home 2064208 115920 1843432 6% /home /dev/mapper/vg-opt 1032088 34088 945572 4% /opt /dev/mapper/vg-root 2064208 311096 1648256 16% /root /dev/mapper/vg-usr 10321208 2098648 7698272 22% /usr /dev/mapper/vg-var 20642428 211060 19382792 2% /var /dev/mapper/vg-tmp 2064208 68676 1890676 4% /tmp Examining the initramfs, I can see that the genkernel generated initramfs does not include any of the virtio modules. As a result, no virtio block devices are seen and the mdraid devices are never assembled.
(In reply to comment #2) > I ran into this too. I'm trying to simulate setting up a Gentoo system with 4 > disks, each set of 2 disks set up in a software RAID1, with the /boot on an md > device and the remainder of the RAID1 devices in a volume group, from which I > parse out the root filesystem, etc. > > Like this: > > (chroot) livecd home # cat /proc/mdstat > Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] > md1 : active raid1 vda1[0] vdb1[1] > 97664 blocks [2/2] [UU] > > md2 : active raid1 vda3[0] vdb3[1] > 25139456 blocks [2/2] [UU] > > md3 : active raid1 vdc1[0] vdd1[1] > 26213952 blocks [2/2] [UU] > > unused devices: <none> > > (chroot) livecd home # pvscan > PV /dev/md2 VG vg lvm2 [23.97 GiB / 8.97 GiB free] > PV /dev/md3 VG vg lvm2 [25.00 GiB / 3.00 GiB free] > Total: 2 [48.97 GiB] / in use: 2 [48.97 GiB] / in no VG: 0 [0 ] > > > And so, the set of filesystems, including /, are: > > /dev/mapper/vg-root 2064208 311096 1648256 16% / > /dev/md1 94567 9666 80018 11% /boot > /dev/mapper/vg-home 2064208 115920 1843432 6% /home > /dev/mapper/vg-opt 1032088 34088 945572 4% /opt > /dev/mapper/vg-root 2064208 311096 1648256 16% /root > /dev/mapper/vg-usr 10321208 2098648 7698272 22% /usr > /dev/mapper/vg-var 20642428 211060 19382792 2% /var > /dev/mapper/vg-tmp 2064208 68676 1890676 4% /tmp > > Examining the initramfs, I can see that the genkernel generated initramfs does > not include any of the virtio modules. > > As a result, no virtio block devices are seen and the mdraid devices are never > assembled. > genkernel can be configured to include the virtio modules in the initramfs by appending the following line to your /etc/genkernel.conf: MODULES_KVM="virtio virtio_balloon virtio_ring virtio_pci virtio_blk virtio_net" You can then load the block driver on boot by appending the following to your kernel boot options: doload=virtio_pci,virtio_blk I have a guest using the virtio drivers and running entirely on top of LVM whose kernel I build with genkernel using the above method. I'm using Grub 2 as the bootloader. I DID NOT use grub-mkconfig as it seems to be broken (I emerged grub-9999 since grub-1.98's root-on-LVM support also seems to be broken).
device-mapper 1.02.28 seems to build fine but I currently cannot get LVM2 compiling from genkernel. I get errors for all of 2.02.28, 2.02.36 and 2.02.74. I have tried applying patches from Gentoo ebuilds, too. Please help me getting a newer version compiling. These commands can get you started. # git clone git://git.overlays.gentoo.org/proj/genkernel.git # git co -t origin/experimental # sudo mv /sbin/lvm.static{,_BACKUP} # sudo GK_SHARE="$PWD" ./genkernel initramfs Patches found in ${GK_SHARE}/patches/lvm/${LVM_VER}/ are auto-applied for you.
PS: "git co" is my alias for "git checkout". Should have said that.
genkernel-99999 (five nines) is now using LVM 2.02.74 which does not depend on sys-fs/device-mapper any more.
