Comment 3 for bug 1096983

Hi guys,

This patch doesn't address the issue. Nova's driver.attach_volume happens before the volume_api.attach is even called. Cinder's attach is just a notification.

To fix this issue, we may have to do something like making reserve_volume do something useful. Maybe I have to do something in my driver to handle this?

It seems really easy to duplicate:

nova volume-attach <instanceid1> <volumeid> auto& nova volume-attach <instanceid2> <volumeid> auto&

root@nova:~# virsh list
 Id Name State
----------------------------------
  1 instance-00000001 running
  2 instance-00000002 running

root@nova:~# virsh domblklist 1
Target Source
------------------------------------------------
vda /etc/nova/state/instances/instance-00000001/disk
vdb /dev/disk/by-path/ip-10.127.0.166:3260-iscsi-iqn.2010-11.com.rackspace:9cba7916-f5e4-4edb-8bb6-7582d6609e9c-lun-0

root@nova:~# virsh domblklist 2
Target Source
------------------------------------------------
vda /etc/nova/state/instances/instance-00000002/disk
vdb /dev/disk/by-path/ip-10.127.0.166:3260-iscsi-iqn.2010-11.com.rackspace:9cba7916-f5e4-4edb-8bb6-7582d6609e9c-lun-0