I'm trying to migrate existing IDE-using, LVM-based CentOS 5.2 VMs to use virtio. The symptom is a kernel panic upon boot when the system can't find any volume groups. Does anyone know how to make this work?
I created a vm install that didn't use LVM and was able to switch it over to use virtio. This is the where I've gotten to when using LVM:
Steps:
- Install CentOS 5.2 in kvm, which uses LVM, on an ide disk.
- Install a newer kernel with virtio support, in my case, 2.6.18-371.6.1.el5.centos.plus and modify configs (detailed below).
- Shut down the system. Change the disk type to virtio in the virt-manager config.
- Boot and select the new kernel at the grub prompt. "No volume groups found" and a kernel panic.
In the second step above, I updated /boot/grub/device.map, /etc/modprobe.conf, and re-ran mkinitrd.
/boot/grub/device.map:
# this device map was generated by anaconda (hd0) /dev/vda /etc/modprobe.conf:
alias eth0 virtio_net alias scsi_hostadapter virtio_blk alias snd-card-0 snd-hda-intel options snd-card-0 index=0 options snd-hda-intel index=0 remove snd-hda-intel { /usr/sbin/alsactl store 0 >/dev/null 2>&1 || : ; }; /sbin/modprobe -r --ignore-remove snd-hda-intel /boot/grub/grub.conf:
default=0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.18-371.6.1.el5.centos.plus) root (hd0,0) kernel /vmlinuz-2.6.18-371.6.1.el5.centos.plus ro root=/dev/VolGroup00/LogVol00 initrd /initrd-2.6.18-371.6.1.el5.centos.plus.img I uncompressed the initrd image and the virtio modules appear to be there:
[root@localhost initrd]# ls -1 /tmp/initrd/lib/ | grep virt virtio_blk.ko virtio.ko virtio_pci.ko virtio_ring.ko I upgraded to mkinitrd-5.1.19.6-80.el5_9 that uses lvm dumpconfig to generate lvm.conf:
[root@localhost initrd]# cat /tmp/initrd/etc/lvm/lvm.conf devices { dir="/dev" scan="/dev" preferred_names=[] filter="a/.*/" cache_dir="/etc/lvm/cache" cache_file_prefix="" write_cache_state=1 sysfs_scan=1 md_component_detection=1 ignore_suspended_devices=0 } activation { missing_stripe_filler="/dev/ioerror" reserved_stack=256 reserved_memory=8192 process_priority=-18 mirror_region_size=512 readahead="auto" mirror_log_fault_policy="allocate" mirror_device_fault_policy="remove" } global { umask=63 test=0 units="h" activation=1 proc="/proc" locking_type=1 fallback_to_clustered_locking=1 fallback_to_local_locking=1 locking_dir="/var/lock/lvm" } shell { history_size=100 } backup { backup=1 backup_dir="/etc/lvm/backup" archive=1 archive_dir="/etc/lvm/archive" retain_min=10 retain_days=30 } log { verbose=0 syslog=1 overwrite=0 level=0 indent=1 command_names=0 prefix=" " } I checked for CONFIG_SYSFS_DEPRECATED like in this question, but that appears to be a post-2.6.18 option.
Does anyone know what is still missing?
