[libvirt-users] block-commit fails

Tue Dec 15 15:17:41 UTC 2015

I don’t see anything special.

With qmeu  >2.1, I had also some trouble with active block commit. I now use qemu 2.1 …

I haven’t got the time to test the newest version.

Maybe downgrading to 2.1 will do the trick?

Van: libvirt-users-bounces at redhat.com [mailto:libvirt-users-bounces at redhat.com] Namens Firat KÜÇÜK
Verzonden: maandag 14 december 2015 9:58
Aan: libvirt-users at redhat.com
Onderwerp: Re: [libvirt-users] block-commit fails

Hello,
On 14-12-2015 10:03, Dominique Ramaekers wrote:
Please provide more information like

Virsh version
Compiled against library: libvirt 1.2.12
Using library: libvirt 1.2.12
Using API: QEMU 1.2.12
Running hypervisor: QEMU 2.2.0

Virsh dumpxml my-vm

<domain type='kvm' id='351'>

  <name>my-vm</name>

  <uuid>8acea561-ade3-40de-bb3b-b008a59096ca</uuid>

  <memory unit='KiB'>4194304</memory>

  <currentMemory unit='KiB'>4194304</currentMemory>

  <vcpu placement='static'>2</vcpu>

  <resource>

    <partition>/machine</partition>

  </resource>

  <os>

    <type arch='x86_64' machine='pc-i440fx-utopic'>hvm</type>

    <boot dev='hd'/>

  </os>

  <features>

    <acpi/>

    <apic/>

    <pae/>

  </features>

  <cpu mode='custom' match='exact'>

    <model fallback='allow'>SandyBridge</model>

  </cpu>

  <clock offset='utc'>

    <timer name='rtc' tickpolicy='catchup'/>

    <timer name='pit' tickpolicy='delay'/>

    <timer name='hpet' present='no'/>

  </clock>

  <on_poweroff>destroy</on_poweroff>

  <on_reboot>restart</on_reboot>

  <on_crash>restart</on_crash>

  <devices>

    <emulator>/usr/bin/kvm-spice</emulator>

    <disk type='file' device='disk'>

      <driver name='qemu' type='qcow2'/>

      <source file='/foo/my-vm.img'/>

      <source file='/foo/my-vm-snapshot.img'/>

      <backingStore type='file' index='1'>

        <format type='qcow2'/>

        <source file='/foo/my-vm.img'/>

        <backingStore/>

      </backingStore>

      <target dev='vda' bus='virtio'/>

      <alias name='virtio-disk0'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>

    </disk>

    <controller type='usb' index='0' model='ich9-ehci1'>

      <alias name='usb0'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x7'/>

    </controller>

    <controller type='usb' index='0' model='ich9-uhci1'>

      <alias name='usb0'/>

      <master startport='0'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0' multifunction='on'/>

    </controller>

    <controller type='usb' index='0' model='ich9-uhci2'>

      <alias name='usb0'/>

      <master startport='2'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x1'/>

    </controller>

    <controller type='usb' index='0' model='ich9-uhci3'>

      <alias name='usb0'/>

      <master startport='4'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x2'/>

    </controller>

    <controller type='pci' index='0' model='pci-root'>

      <alias name='pci.0'/>

    </controller>

    <interface type='bridge'>

      <mac address='ba:ba:00:00:00:09'/>

      <source network='br-vms' bridge='br-vms'/>

      <target dev='vnet4'/>

      <model type='virtio'/>

      <alias name='net0'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>

    </interface>

    <serial type='pty'>

      <source path='/dev/pts/8'/>

      <target port='0'/>

      <alias name='serial0'/>

    </serial>

    <console type='pty' tty='/dev/pts/8'>

      <source path='/dev/pts/8'/>

      <target type='serial' port='0'/>

      <alias name='serial0'/>

    </console>

    <input type='mouse' bus='ps2'/>

    <input type='keyboard' bus='ps2'/>

    <graphics type='vnc' port='5901' autoport='no' listen='0.0.0.0' keymap='tr'>

      <listen type='address' address='0.0.0.0'/>

    </graphics>

    <video>

      <model type='vmvga' vram='16384' heads='1'/>

      <alias name='video0'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>

    </video>

    <memballoon model='virtio'>

      <alias name='balloon0'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>

    </memballoon>

    <rng model='virtio'>

      <backend model='egd' type='tcp'>

        <source mode='connect' host='localhost' service='8000'/>

        <protocol type='raw'/>

      </backend>

      <alias name='rng0'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>

    </rng>

  </devices>

</domain>

qemu-info /foo/my-vm-snapshot.img
I used qemu-img info command

image: my-vm-snapshot.img
file format: qcow2
virtual size: 80G (85899345920 bytes)
disk size: 927M
cluster_size: 65536
backing file: /opt/datastore/bulutkare-914.img
backing file format: qcow2
Format specific information:
    compat: 1.1
    lazy refcounts: false
    corrupt: false

According to http://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit your active block commit command should look like:
virsh blockcommit vm1 vda --active --verbose –pivot

thus one command…

Yes, I tried the single commit & pivot command.
But according to my experiences 2 commands pivot over is more stable than one command.
I don't know why but I tried lots of time.

Does your error comes after your third command?
Yes.

virsh blockjob my-vm vda --pivot

Van: libvirt-users-bounces at redhat.com<mailto:libvirt-users-bounces at redhat.com> [mailto:libvirt-users-bounces at redhat.com] Namens Firat KÜÇÜK
Verzonden: zondag 13 december 2015 20:00
Aan: libvirt-users at redhat.com<mailto:libvirt-users at redhat.com>
Onderwerp: [libvirt-users] block-commit fails

Hello,

one of my VM's blockcommit job always fails. How can I find the reason? Error message is not clear.

virsh snapshot-create-as --domain my-vm backup-snapshot \

    --diskspec vda,file=/foo/my-vm-snapshot.img \

    --disk-only --atomic --no-metadata

virsh blockcommit my-vm vda --active --verbose --wait --async

virsh blockjob my-vm vda --pivot

internal error: unable to execute QEMU command 'block-job-complete': The active block job for device 'drive-virtio-disk0' cannot be completed

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