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initrd is not updated after guest device configuration change, that may make a different device path, or missing virtio_blk module when booting. Could you show the output of "lsmod | grep virtio" and "ls -R /dev/disk /dev/mapper" after it drops to dracut shell?
Fam
(In reply to ShupingCui from comment #1)
> Created attachment 926005[details]
> serial log
>
> Test with qemu-kvm-1.5.3-67.el7.x86_64, not met this issue.
This is an open question that needs some more investigation.
Fam
Can't reproduce after testing again with qemu-kvm-rhev-2.1.0-2.el7.x86_64.
When generating initrd, during either system installation or kernel update, dracut takes care of installing *both* virtio-blk and virtio-scsi drivers into the initramfs image, as long as it finds itself inside a virtual machine. (that is detected with running `systemd-detect-virt --vm` in guest). This logic is guaranteed by the qemu module (/usr/lib/dracut/modules.d/90qemu).
For both qemu-kvm and qemu-kvm-rhev, the output of systemd-detect-virt command is "kvm".
I checked that in the test env, these look fine and work as expected.
So interchanging the system disk type between virtio-blk and virtio-scsi for RHEL 7 guest should just work. If in some way it is broken and only one of the two drivers is present in initrd, systemd-detect-virt, dracut and anaconda are the points to check.
Fam
Description of problem: install rhel7 guest with virtio_scsi, then boot up with virtio_blk, guest cannot boot up with: systemd-fsck[282]: fsck: error 2 (No such file or directory) while executing fsck.ext2 for /dev/mapper/rhel_unused-root Version-Release number of selected component (if applicable): # uname -r 3.10.0-142.el7.x86_64 # rpm -q qemu-kvm-rhev qemu-kvm-rhev-2.1.0-1.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. install rhel7 guest with virtio_scsi /bin/qemu-kvm \ -name 'virt-tests-vm1' \ -sandbox off \ -M pc \ -nodefaults \ -vga qxl \ -global qxl-vga.vram_size=33554432 \ -device intel-hda,bus=pci.0,addr=03 \ -device hda-duplex \ -chardev socket,id=qmp_id_qmpmonitor1,path=/tmp/monitor-qmpmonitor1-20140805-105741-5Mo1JeBh,server,nowait \ -mon chardev=qmp_id_qmpmonitor1,mode=control \ -chardev socket,id=serial_id_serial0,path=/tmp/serial-serial0-20140805-105741-5Mo1JeBh,server,nowait \ -device isa-serial,chardev=serial_id_serial0 \ -device virtio-serial-pci,id=virtio_serial_pci0,bus=pci.0,addr=04 \ -chardev socket,id=devvs,path=/tmp/virtio_port-vs-20140805-105741-5Mo1JeBh,server,nowait \ -device virtserialport,chardev=devvs,name=vs,id=vs,bus=virtio_serial_pci0.0 \ -chardev socket,id=seabioslog_id_20140805-105741-5Mo1JeBh,path=/tmp/seabios-20140805-105741-5Mo1JeBh,server,nowait \ -device isa-debugcon,chardev=seabioslog_id_20140805-105741-5Mo1JeBh,iobase=0x402 \ -device nec-usb-xhci,id=usb1,bus=pci.0,addr=05 \ -device virtio-scsi-pci,id=virtio_scsi_pci0,bus=pci.0,addr=06 \ -drive id=drive_image1,if=none,cache=none,snapshot=off,aio=native,file=/root/staf-kvm-devel/autotest-devel/client/tests/virt/shared/data/images/RHEL-Server-7.0-64-virtio.qcow2 \ -device scsi-hd,id=image1,drive=drive_image1 \ -device virtio-net-pci,mac=9a:a6:a7:a8:a9:aa,id=idgAoeCh,vectors=4,netdev=idEFK6HS,bus=pci.0,addr=07 \ -netdev tap,id=idEFK6HS,vhost=on,vhostfd=23,fd=22 \ -m 8192 \ -smp 4,cores=2,threads=1,sockets=2 \ -cpu 'SandyBridge',+kvm_pv_unhalt \ -drive id=drive_cd1,if=none,snapshot=off,aio=native,media=cdrom,file=/root/staf-kvm-devel/autotest-devel/client/tests/virt/shared/data/isos/linux/RHEL7.0-Server-x86_64.iso \ -device ide-cd,id=cd1,drive=drive_cd1,bus=ide.0,unit=0 \ -drive id=drive_unattended,if=none,snapshot=off,aio=native,media=cdrom,file=/root/staf-kvm-devel/autotest-devel/client/tests/virt/shared/data/images/rhel70-64/ks.iso \ -device ide-cd,id=unattended,drive=drive_unattended,bus=ide.0,unit=1 \ -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \ -kernel '/root/staf-kvm-devel/autotest-devel/client/tests/virt/shared/data/images/rhel70-64/vmlinuz' \ -append 'ksdevice=link ks=cdrom:/dev/sr1:/ks.cfg nicdelay=60 console=ttyS0,115200 console=tty0' \ -initrd '/root/staf-kvm-devel/autotest-devel/client/tests/virt/shared/data/images/rhel70-64/initrd.img' \ -spice port=3000,password=123456,addr=0,tls-port=3200,x509-dir=/tmp/spice_x509d,tls-channel=main,tls-channel=inputs,image-compression=auto_glz,zlib-glz-wan-compression=auto,streaming-video=all,agent-mouse=on,playback-compression=on,ipv4 \ -rtc base=utc,clock=host,driftfix=slew \ -boot order=cdn,once=d,menu=off \ -no-kvm-pit-reinjection \ -no-shutdown \ -enable-kvm 2. boot up with virtio_blk after installation successfully /bin/qemu-kvm \ -name 'virt-tests-vm1' \ -sandbox off \ -M pc \ -nodefaults \ -vga qxl \ -global qxl-vga.vram_size=33554432 \ -device intel-hda,bus=pci.0,addr=03 \ -device hda-duplex \ -chardev socket,id=qmp_id_qmpmonitor1,path=/tmp/monitor-qmpmonitor1-20140806-031148-naaCrkbi,server,nowait \ -mon chardev=qmp_id_qmpmonitor1,mode=control \ -chardev socket,id=serial_id_serial0,path=/tmp/serial-serial0-20140806-031148-naaCrkbi,server,nowait \ -device isa-serial,chardev=serial_id_serial0 \ -device virtio-serial-pci,id=virtio_serial_pci0,bus=pci.0,addr=04 \ -chardev socket,id=devvs,path=/tmp/virtio_port-vs-20140806-031148-naaCrkbi,server,nowait \ -device virtserialport,chardev=devvs,name=vs,id=vs,bus=virtio_serial_pci0.0 \ -chardev socket,id=seabioslog_id_20140806-031148-naaCrkbi,path=/tmp/seabios-20140806-031148-naaCrkbi,server,nowait \ -device isa-debugcon,chardev=seabioslog_id_20140806-031148-naaCrkbi,iobase=0x402 \ -device nec-usb-xhci,id=usb1,bus=pci.0,addr=05 \ -drive id=drive_image1,if=none,cache=none,snapshot=off,aio=native,file=/root/staf-kvm-devel/autotest-devel/client/tests/virt/shared/data/images/RHEL-Server-7.0-64-virtio.qcow2 \ -device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=0,bus=pci.0,addr=06 \ -device virtio-net-pci,mac=9a:7e:7f:80:81:82,id=idId3JMe,vectors=4,netdev=idReBNst,bus=pci.0,addr=07 \ -netdev tap,id=idReBNst,vhost=on,vhostfd=23,fd=22 \ -m 8192 \ -smp 4,cores=2,threads=1,sockets=2 \ -cpu 'SandyBridge',+kvm_pv_unhalt \ -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \ -spice port=3000,password=123456,addr=0,tls-port=3200,x509-dir=/tmp/spice_x509d,tls-channel=main,tls-channel=inputs,image-compression=auto_glz,zlib-glz-wan-compression=auto,streaming-video=all,agent-mouse=on,playback-compression=on,ipv4 \ -rtc base=utc,clock=host,driftfix=slew \ -boot order=cdn,once=c,menu=off \ -no-kvm-pit-reinjection \ -enable-kvm 3. Actual results: cannot boot up with: systemd-fsck[282]: fsck: error 2 (No such file or directory) while executing fsck.ext2 for /dev/mapper/rhel_unused-root Expected results: boot up successfully Additional info: guest ks file: install KVM_TEST_MEDIUM graphical poweroff lang en_US.UTF-8 keyboard us network --onboot yes --device eth0 --bootproto dhcp rootpw redhat firewall --enabled --ssh selinux --enforcing timezone --utc America/New_York firstboot --disable bootloader --location=mbr --append="console=tty0 console=ttyS0,115200 rootfstype=xfs" zerombr clearpart --all --initlabel autopart xconfig --startxonboot %packages --ignoremissing @base @core @development @additional-devel @debugging-tools @network-tools @basic-desktop @desktop-platform @fonts @general-desktop @graphical-admin-tools @x11 lftp gcc gcc-c++ patch make git nc NetworkManager ntpdate redhat-lsb numactl-libs numactl sg3_utils hdparm lsscsi libaio-devel perl-Time-HiRes flex prelink %end %post echo "OS install is completed" > /dev/ttyS0 echo "remove rhgb quiet by grubby" > /dev/ttyS0 grubby --remove-args="rhgb quiet" --update-kernel=$(grubby --default-kernel) echo "dhclient" > /dev/ttyS0 dhclient echo "get repo" > /dev/ttyS0 wget http://fileshare.englab.nay.redhat.com/pub/section2/repo/epel/rhel-autotest.repo -O /etc/yum.repos.d/rhel-autotest.repo echo "yum makecache" > /dev/ttyS0 yum makecache echo "yum install -y stress" > /dev/ttyS0 yum install -y stress echo "chkconfig sshd on" > /dev/ttyS0 chkconfig sshd on echo "iptables -F" > /dev/ttyS0 iptables -F echo "echo 0 > selinux/enforce" > /dev/ttyS0 echo 0 > /selinux/enforce echo "chkconfig NetworkManager on" > /dev/ttyS0 chkconfig NetworkManager on echo "update ifcfg-eth0" > /dev/ttyS0 sed -i "/^HWADDR/d" /etc/sysconfig/network-scripts/ifcfg-eth0 echo "Disable lock cdrom udev rules" > /dev/ttyS0 sed -i "/--lock-media/s/^/#/" /usr/lib/udev/rules.d/60-cdrom_id.rules 2>/dev/null>&1 echo 'Post set up finished' > /dev/ttyS0 echo Post set up finished > /dev/hvc0 %end