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[Adam Gandelman <1362221@xxxxxxxxxxxxxxxxxx>]

** Also affects: nova/icehouse
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1362221

Title:
  VMs fail to start when Ceph is used as a backend for ephemeral drives

Status in OpenStack Compute (Nova):
  Fix Committed
Status in OpenStack Compute (nova) icehouse series:
  New

Bug description:
  VMs' drives placement in Ceph option has been chosen
  (libvirt.images_types == 'rbd').

  When user creates a flavor and specifies:
     - root drive size >0
     - ephemeral drive size >0 (important)

  and tries to boot a VM, he gets "no valid host was found" in the
  scheduler log:

  Error from last host: node-3.int.host.com (node node-3.int.host.com): [u'Traceback (most recent call last):\n', u'
   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1305, in _build_instance\n set_access_ip=set_access_ip)\n', u' File "/usr/l
  ib/python2.6/site-packages/nova/compute/manager.py", line 393, in decorated_function\n return function(self, context, *args, **kwargs)\n', u' File
   "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1717, in _spawn\n LOG.exception(_(\'Instance failed to spawn\'), instance=instanc
  e)\n', u' File "/usr/lib/python2.6/site-packages/nova/openstack/common/excutils.py", line 68, in __exit__\n six.reraise(self.type_, self.value, se
  lf.tb)\n', u' File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1714, in _spawn\n block_device_info)\n', u' File "/usr/lib/py
  thon2.6/site-packages/nova/virt/libvirt/driver.py", line 2259, in spawn\n admin_pass=admin_password)\n', u' File "/usr/lib/python2.6/site-packages
  /nova/virt/libvirt/driver.py", line 2648, in _create_image\n ephemeral_size=ephemeral_gb)\n', u' File "/usr/lib/python2.6/site-packages/nova/virt/
  libvirt/imagebackend.py", line 186, in cache\n *args, **kwargs)\n', u' File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/imagebackend.py",
  line 587, in create_image\n prepare_template(target=base, max_size=size, *args, **kwargs)\n', u' File "/usr/lib/python2.6/site-packages/nova/opens
  tack/common/lockutils.py", line 249, in inner\n return f(*args, **kwargs)\n', u' File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/imagebac
  kend.py", line 176, in fetch_func_sync\n fetch_func(target=target, *args, **kwargs)\n', u' File "/usr/lib/python2.6/site-packages/nova/virt/libvir
  t/driver.py", line 2458, in _create_ephemeral\n disk.mkfs(os_type, fs_label, target, run_as_root=is_block_dev)\n', u' File "/usr/lib/python2.6/sit
  e-packages/nova/virt/disk/api.py", line 117, in mkfs\n utils.mkfs(default_fs, target, fs_label, run_as_root=run_as_root)\n', u' File "/usr/lib/pyt
  hon2.6/site-packages/nova/utils.py", line 856, in mkfs\n execute(*args, run_as_root=run_as_root)\n', u' File "/usr/lib/python2.6/site-packages/nov
  a/utils.py", line 165, in execute\n return processutils.execute(*cmd, **kwargs)\n', u' File "/usr/lib/python2.6/site-packages/nova/openstack/commo
  n/processutils.py", line 193, in execute\n cmd=\' \'.join(cmd))\n', u"ProcessExecutionError: Unexpected error while running command.\nCommand: sudo
   nova-rootwrap /etc/nova/rootwrap.conf mkfs -t ext3 -F -L ephemeral0 /var/lib/nova/instances/_base/ephemeral_1_default\nExit code: 1\nStdout: ''\nStde
  rr: 'mke2fs 1.41.12 (17-May-2010)\\nmkfs.ext3: No such file or directory while trying to determine filesystem size\\n'\n"]

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