Re: [libvirt] virsh [attach-detach]-device question

I have noticed a behavior I am hoping someone can help me understand. Consider the following scenario: 1.) Start a test dummy qemu-kvm instance with no OS via virsh named "no_os". 2.) Attach a device to it; [root@host ~]# virsh attach-device no_os /root/hotplug_device_b.xml Device attached successfully [root@host ~]# 3.) Now detach the same device; [root@host ~]# virsh detach-device no_os /root/hotplug_device_b.xml Device detached successfully [root@host ~]# 4.) Now re-attach the same device; [root@host ~]# virsh attach-device no_os /root/hotplug_device_b.xml error: Failed to attach device from /root/hotplug_device_b.xml error: internal error unable to execute QEMU command 'device_add': Duplicate ID 'virtio-disk1' for device [root@host ~]# Is this expected behavior? If so, why does my detach-device call in step 3 appear to not free the device, leading to the duplicate ID error in step 4? Libvirt XML's used: /root/hotplug_device_b.xml: <disk type='block' device='disk'> <driver name='qemu' cache='none'/> <source dev="/dev/syseng/hotplug_test_b"/> <target dev="vdb" bus="virtio"/> </disk> I started the "no_os" instance with this: <domain type="kvm"> <name>no_os</name> <uuid>E605BE96-6BC9-11E2-976C-EDA8DB8AEF42</uuid> <memory>524288</memory> <currentMemory>524288</currentMemory> <vcpu>1</vcpu> <os> <type arch="x86_64" machine="pc-1.1">hvm</type> <boot dev="hd"/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset="utc"/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/opt/kvm-stack-1/libexec/qemu-kvm-wrapper</emulator> <disk type="block" device="disk"> <driver name="qemu" cache="none"/> <source dev="/dev/LVM/no_os"/> <target dev="vda" bus="virtio"/> </disk> <disk type="file" device="cdrom"> <target dev="hdc" bus="ide"/> <readonly/> </disk> <serial type="pty"> <target port="0"/> </serial> <console type="pty"> <target port="0"/> </console> <input type="mouse" bus="ps2"/> <graphics type="vnc" port="-1" autoport="yes" keymap="en-us"/> <interface type="bridge"> <mac address="52:54:00:87:14:3d"/> <source bridge="virbr0"/> <target dev="no_os_0"/> <model type="virtio"/> </interface></devices> </domain> -- libvir-list mailing list libvir-list(a)redhat.com https://www.redhat.com/mailman/listinfo/libvir-list