One detail; the code we used in KVM had a driver name='qemu', and running that code right away gives the error message;
# virsh attach-device deb cdrom7.xml 1 error: Failed to attach device from cdrom7.xml error: POST operation failed: xend_post: error from xen daemon: (xend.err 'Block device type "qemu" is invalid.') //Daniel On Feb 10, 2012, at 11:24 AM, Daniel Espling wrote: > Hi! > > We're struggling to get device detaching to work reliably using Xen. We can > reliably use the same code to manage devices using Libvirt+KVM without any > problems. We've tested this on Xen with both CD-ROM and USB devices without > success. See below for detailed descriptions. > > Thankful for any help! > > Regards, > Daniel Espling > > --- > > For CD-ROM, we can mount them using attach-device but cannot remove them > using the correspoding call to detach-device: > > cdrom7.xml contains: > <disk type='file' device='cdrom'> > <driver name='file' type='raw'/> > <source file='/opt/diskimages/test7.iso'/> > <target dev='hdc' bus='ide'/> > <readonly/> > </disk> > > eject.xml contains: > <disk type='block' device='cdrom'> > <driver name='file'/> > <target dev='hdc' bus='ide'/> > <readonly/> > </disk> > > cdrom8.xml is identical to cdrom7.xml apart from the .iso file used. > > # virsh attach-device deb cdrom7.xml > > Device attached successfully > > # virsh detach-device deb cdrom7.xml > > error: no such device in deb > > # virsh attach-device deb eject.xml > error: Failed to attach device from eject.xml > error: POST operation failed: xend_post: error from xen daemon: (xend.err > 'Device 5632 not connected') > > # virsh update-device deb cdrom8.xml --persistent > error: Failed to update device from cdrom8.xml > error: POST operation failed: xend_post: error from xen daemon: (xend.err > 'Device 5632 not connected') > > dumpxml shows the cdrom device attached exactly as it's defined in the xml. > > Using virsh we're able to use "virsh detach-disk deb hdc" to unmount the > CD-ROM, but we need to be able to do this using the python API. We cannot > find a corresponding call to detach-disk and we therefore have to rely on > detach-device instead, right? Are there any flags we can use for > detachDeviceFlags() to replicate the functionality of detach-disk? > > ---- > > Similarly for USB devices, we can mount them OK but not remove them using the > corresponding call to detach-device. Calling detach-disk works, but again we > need to find the corresponding call for this function using the python API. > One thing we've found with mounting USB devices is that they seem to be > mounted on the SCSI bus instead of the USB one as specified: > > Example: > > usb7.xml contains: > <disk type='file' device='disk'> > <driver name='file' type='raw'/> > <source file='/opt/diskimages/test7.iso'/> > <target dev='sda' bus='usb'/> > <readonly/> > </disk> > > dumpxml shows: > <disk type='file' device='disk'> > <driver name='file'/> > <source file='/opt/diskimages/test7.iso'/> > <target dev='sda' bus='scsi'/> > <readonly/> > </disk> > > # virsh attach-device deb usb7.xml > Device attached successfully > > Test attaching again (expected to fail): > # virsh attach-device deb usb7.xml > > error: Failed to attach device from usb7.xml > error: Requested operation is not valid: target 'sda' already exists > > `-testgrid7.leeds.ac.uk /opt/recontext # virsh detach-device deb usb7.xml > error: no such device in deb > > ---- > > Relevant info: > > Compiled against library: libvir 0.9.9 > Using library: libvir 0.9.9 > Using API: Xen 0.9.9 > Running hypervisor: Xen 4.0.0 > > Running CentOS 5.5 (final) > Linux 2.6.32.24 #3 SMP Fri Oct 29 16:22:02 BST 2010 x86_64 x86_64 x86_64 > GNU/Linux > _______________________________________________ > libvirt-users mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/libvirt-users
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