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[Sean Dague <sean@xxxxxxxxx>]

** Changed in: nova
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1223611

Title:
  Can not attach a volume to a running compute instance

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  When I attempt to attach a volume using the nova cli or horizon:

  $ nova volume-attach 7a0a3ffa-603a-4758-8533-32ffd9974d03 66e834db-0f98-45fd-bfa0-6386f4a965a4 /dev/vdb
  +----------+--------------------------------------+
  | Property | Value                                |
  +----------+--------------------------------------+
  | device   | /dev/hdb                             |
  | serverId | 7a0a3ffa-603a-4758-8533-32ffd9974d03 |
  | id       | 66e834db-0f98-45fd-bfa0-6386f4a965a4 |
  | volumeId | 66e834db-0f98-45fd-bfa0-6386f4a965a4 |
  +----------+--------------------------------------+

  (note the returned device is /dev/hdb not /dev/vdb)

  In the error logs on the compute host:

  ... a large stack dump and ...
  /var/log/nova/nova-compute.log: 2013-09-10 16:57:26.979 4774 TRACE nova.openstack.common.rpc.amqp libvirtError: unsupported configuration: disk bus 'ide' cannot be hotplugged.
  /var/log/libvirt/libvirtd.log: 2013-09-10 23:57:23.529+0000: 1886: error : qemuDomainAttachDeviceDiskLive:5870 : unsupported configuration: disk bus 'ide' cannot be hotplugged.

  
  libvirt uses the device name as a hint as to what driver to use when attaching a new device. The instance has been booted from another volume which means volumes can be attached successfully (but only on boot.)

  I have also tried specifying /dev/sdb, /dev/xvdb with the same
  failure. Specifying just 'vdb' raises InvalidDevicePath.

  I am running nova-compute on Ubuntu from a package, version
  2013.1.2-0ubuntu1.

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