> Op 21 december 2016 om 12:00 schreef Rohit Yadav <rohit.ya...@shapeblue.com>: > > > All, > > > Based on results from recent Trillian test runs [1], I've discovered that on > KVM (CentOS7) based detaching a volume fails to update the virt/domain xml > and fails to remove the xml. So, while the agent and cloudstack-mgmt server > succeeds, the entry in the xml is not removed. When the volume is attached > again, we can an error like: > > > Failed to attach volume xxx to VM VM-yyyy; org.libvirt.LibvirtException: XML > error: target 'vdb' duplicated for disk sources > '/mnt/8a70be4e-4c3c-38e5-aea2-4b38fef83fd5/af85ff7e-a452-43de-8c6b-948dc44aae21' > and > '/mnt/8a70be4e-4c3c-38e5-aea2-4b38fef83fd5/af85ff7e-a452-43de-8c6b-948dc44aae21'This > is seen in agent logs: > > Dec 21 10:46:35 pr1837-t692-kvm-centos7-kvm2 sh[27400]: DEBUG > [kvm.storage.KVMStorageProcessor] (agentRequest-Handler-2:) (logid:0648ae70) > Detaching device: <disk device='disk' type='file'> > Dec 21 10:46:35 pr1837-t692-kvm-centos7-kvm2 sh[27400]: <driver name='qemu' > type='qcow2' cache='none' /> > Dec 21 10:46:35 pr1837-t692-kvm-centos7-kvm2 sh[27400]: <source > file='/mnt/8a70be4e-4c3c-38e5-aea2-4b38fef83fd5/af85ff7e-a452-43de-8c6b-948dc44aae21'/> > Dec 21 10:46:35 pr1837-t692-kvm-centos7-kvm2 sh[27400]: <target dev='vdb' > bus='virtio'/> > Dec 21 10:46:35 pr1837-t692-kvm-centos7-kvm2 sh[27400]: </disk> > > While, after above completes. This is still seen in the VM's dumped xml: > <disk type='file' device='disk'> > <driver name='qemu' type='qcow2' cache='none'/> > <source > file='/mnt/8a70be4e-4c3c-38e5-aea2-4b38fef83fd5/af85ff7e-a452-43de-8c6b-948dc44aae21'/> > <backingStore/> > <target dev='vdb' bus='virtio'/> > <serial>af85ff7ea45243de8c6b</serial> > <alias name='virtio-disk1'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x05' > function='0x0'/> > </disk> > Steps to reproduce: > 1. Deploy a VM, create a data volume disk and attach to the VM. > 2. Detach the volume. > 3. Attach the volume to the same VM again, exception is caught.Thoughts, > comments?[1] https://github.com/apache/cloudstack/pull/1837 > Regards. >
Isn't this a Qemu bug? That it thinks it detached it, but it doesn't. Or a libvirt thing? > > rohit.ya...@shapeblue.com > www.shapeblue.com > 53 Chandos Place, Covent Garden, London WC2N 4HSUK > @shapeblue > > >
