Re: [libvirt] problem attaching/detaching disk

At 03/05/2011 05:35 AM, Shi Jin Write: > Although the attach/detach problem has been solved, I fond the driver name > issue still causes problems restoring from a saved VM with disk attached. I can reproduce this a bug of libvirt: we can not restore the VM from the file we saved. Thank you for reporting this problem. I will make a patch to fix it. Thanks. Wen Congyang > > For example, once saved, the checkpoint file would contains > <disk type='file' device='disk'> > <driver name='file' type='qcow2'/> > <source > file='/vrstorm/cloud/PrivateAccounts/74d37709b07be4bbae228dfc273e4339/volumes/vol-126'/> > <target dev='vdf' bus='virtio'/> > <alias name='virtio-disk5'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x06' > function='0x0'/> > </disk> > > And then the restore would fail: > > [cloudadmin@test2 images]$ virsh restore checkpoint > error: Failed to restore domain from checkpoint > error: internal error unsupported driver name 'file' for disk > '/vrstorm/cloud/PrivateAccounts/74d37709b07be4bbae228dfc273e4339/volumes/vol-126' > > > If I simply edit the checkpoint file to change file to qemu:<driver > name='qemu' type='qcow2'/> > > Then it works. > > [cloudadmin@test2 images]$ virsh restore checkpoint > Domain restored from checkpoint > > > So there is indeed a problem with the driver name. Maybe I should > start a new thread on it? > > > Shi > > > On Fri, Mar 4, 2011 at 11:44 AM, Shi Jin <jinzishuai(a)gmail.com&gt; wrote: > >> Finally, everything works for if I simply change my template to use the >> /usr/libexec/qemu-kvm instead of /usr/bin/kvm, which is a symbolic link to >> it. >> Not sure why it matters but that does solve all the mysteries. >> >> Shi >> >> On Fri, Mar 4, 2011 at 9:56 AM, Shi Jin <jinzishuai(a)gmail.com&gt; wrote: >> >>> It seems that your qemu does not support monitor command 'drive_add'. >>>> What's version of your qemu? >>>> >>>> Thank you. Here is my version >>> [cloudadmin@test2 ~]$ /usr/libexec/qemu-kvm -version >>> QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2), Copyright (c) >>> 2003-2008 Fabrice Bellard >>> >>> I finally think it is a permission issue. If I run commands as root and >>> get kvm run by the default qemu user, both attach-disk and detach-disk works >>> like your case. >>> >>> However, if I set to run as another user, such as cloudamin, attach-disk >>> works but detach-disk does not. >>> My libvirtd.conf has >>> unix_sock_group = "cloudadmin" >>> unix_sock_rw_perms = "0770" >>> auth_unix_ro = "none" >>> auth_unix_rw = "none" >>> log_level = 3 >>> log_outputs="3:file:/var/log/libvirt/libvirtd.log" >>> >>> and qemu.conf has >>> user = "cloudadmin" >>> group = "cloudadmin" >>> dynamic_ownership = 0 >>> >>> All images are owned by the cloudadmin:cloudadmin. >>> >>> Is there a problem with this setup? >>> >>> Thank you very much. >>> Shi >>> >>>> > 15:31:52.902: debug : virEventRunOnce:595 : Poll got 1 event >>>> >>>>> 15:31:52.902: debug : virEventDispatchTimeouts:405 : Dispatch 3 >>>>> 15:31:52.902: debug : qemuMonitorAddDevice:1878 : mon=0x7f3628341370 >>>>> >>>> device=virtio-blk-pci,bus=pci.0,addr=0x6,drive=drive-virtio-disk1,id=virtio-disk1 >>>> >>>> When 'drive_add' failes, we do not call qemuMonitorAddDevice(). But it is >>>> called. >>>> >>>>> 15:31:52.902: debug : virEventDispatchHandles:450 : Dispatch 8 >>>>> 15:31:52.902: debug : qemuMonitorCommandWithHandler:230 : Send command >>>>> 'device_add >>>>> >>>> virtio-blk-pci,bus=pci.0,addr=0x6,drive=drive-virtio-disk1,id=virtio-disk1' >>>>> for write with FD -1 >>>> >>>> What's the reply of command 'device_add'? Can you provide it. I think it >>>> should fail. >>>> >>>> Thanks. >>>> Wen Congyang >>>> >>>>> >>>>> Than you very much. >>>>> >>>>> Shi >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> On Thu, Mar 3, 2011 at 10:12 PM, Wen Congyang <wency(a)cn.fujitsu.com&gt; >>>> wrote: >>>>> >>>>>> At 03/04/2011 01:00 PM, Shi Jin Write: >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> <disk type='file' device='disk'> >>>>>>>> <driver name='qemu' type='qcow2' cache='none'/> >>>>>>>> <source file='/var/lib/libvirt/images/rhel6rc_64.img'/> >>>>>>>> <target dev='hda' bus='ide'/> >>>>>>>> <alias name='ide0-0-0'/> >>>>>>>> <address type='drive' controller='0' bus='0' unit='0'/> >>>>>>>> </disk> >>>>>>>> <disk type='file' device='cdrom'> >>>>>>>> <driver name='qemu' type='raw'/> >>>>>>>> <source file='/var/lib/libvirt/images/test.iso'/> >>>>>>>> <target dev='hdc' bus='ide'/> >>>>>>>> <readonly/> >>>>>>>> <alias name='ide0-1-0'/> >>>>>>>> <address type='drive' controller='0' bus='1' unit='0'/> >>>>>>>> </disk> >>>>>>>> <disk type='file' device='disk'> >>>>>>>> <driver name='file' type='qcow2'/> >>>>>>>> <source file='/var/lib/libvirt/images/test3.img'/> >>>>>>>> <target dev='vdb' bus='virtio'/> >>>>>>>> <alias name='virtio-disk1'/> >>>>>>>> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' >>>>>>>> function='0x0'/> >>>>>>>> </disk> >>>>>>>> <controller type='ide' index='0'> >>>>>>>> <alias name='ide0'/> >>>>>>>> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' >>>>>>>> function='0x1'/> >>>>>>>> </controller> >>>>>>>> >>>>>>>> >>>>>>>> Thank you very much. It is exactly the same output as mine, >>>> particularly >>>>>>> <driver name='file' type='qcow2'/> >>>>>>> I thought it has to be name='qemu' to detach properly but since you >>>>>> didn't >>>>>>> have a problem, I am very lost on why mine didn't work. >>>>>>> >>>>>>> My libvirtd.log shows (with debugging turned on) >>>>>>> 14:43:18.965: debug : qemuMonitorCommandWithHandler:235 : Receive >>>> command >>>>>>> reply ret=0 errno=0 33 bytes 'Device 'virtio-disk1' not found^M >>>>>>> ' >>>>>>> 14:43:18.965: debug : virEventDispatchTimeouts:405 : Dispatch 3 >>>>>>> 14:43:18.965: debug : virEventDispatchHandles:450 : Dispatch 8 >>>>>>> 14:43:18.965: error : qemuMonitorTextDelDevice:2314 : operation >>>> failed: >>>>>>> detaching virtio-disk1 device failed: Device 'virtio-disk1' not >>>> found^M >>>>>>> >>>>>>> Do you know what the "device not found" error means? >>>>>> >>>>>> It seems attaching virtio-disk1 failed. >>>>>> Can you provide the log when you attach virtio-disk1? >>>>>> >>>>>> Thanks. >>>>>> Wen Congyang >>>>>> >>>>>>> >>>>>>> Thanks. >>>>>>> >>>>>>> Shi >>>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>> >>>> >>> >>> >>> -- >>> Shi Jin, Ph.D. >>> >>> >> >> >> -- >> Shi Jin, Ph.D. >> >> > >