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Hi,

Had some improvement with this issue.

Could boot the instance using virsh, following livemoon advice with small
adaptation.
However the problem still is not fixed.

The volume table was update:
  mysql -unova -p$PW nova -e "update volumes set mountpoint=NULL,
attach_status='detached', instance_uuid=0"
  mysql -unova -p$PW nova -e "update volumes set status='available' where
status <> 'error_deleting'"


Restarted the instance:
# virsh undefine instance-00000038
error: Refusing to undefine while domain managed save image exists

# virsh undefine instance-00000038 --managed-save
Domain instance-00000038 has been undefined

# virsh define libvirt.xml
Domain instance-00000038 defined from libvirt.xml

# virsh start instance-00000038
Domain instance-00000038 started

Then I update the database with the new instances status:
# mysql -unova -p nova -e "update instances set
power_state='1',vm_state='active',task_state=NULL where uuid =
'7e732b31-2ff8-4cf2-a7ac-f1562070cfb3'"

I can now connect to the instance. That is a great improvement from my
original problem.

But there still some serius issues to fix:

The instance can not be rebooted (hard reboot). It will not start, with the
same errors as before.
Also, we can not attach the volume back to the instance:
# nova volume-attach 7e732b31-2ff8-4cf2-a7ac-f1562070cfb3
647db677-aa48-4d1e-b875-80be73469cb5 /dev/vdc
ERROR: The supplied device path (/dev/vdb) is in use.
...
The error is: DevicePathInUse: The supplied device path (/dev/vdb) is in
use.


/dev/vdb is one ephemeral disk. Why nova is trying to use /dev/vdb when I
specified /dev/vdc ?
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