** No longer affects: cinder ** Tags added: libvirt
-- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1304695 Title: glusterfs: Instance is not using the correct volume snapshot file after reboot Status in OpenStack Compute (Nova): In Progress Bug description: Instance is not using the correct volume snapshot file after reboot. Steps to recreate bug: 1. Create a volume 2. Attach volume to a running instance. 3. Take an online snapshot of the volume. Note that the active volume used by the instance is now switched to volume-<uuid>.<snapshot-uuid>. 4. Shutdown the instance. 5. Start the instance. If you invoke virsh dumpxml <instance>, you will see that it is re-attaching the base volume ( volume-<uuid>) to the instance and not the snapshot volume (volume-<uuid>.<snapshot-uuid>). The expected behavior is to have the snapshot volume re-attach to the instance. This bug will cause data corruption in the snapshot and volume. It looks like the nova volume manager is using a stale copy of the block_device_mapping. The block_device_mapping needs to be refreshed in order for the updated volume snapshot to be used. On power on, the nova manager (nova/compute/manager.py ) does: 1. start_instance 2. _power_on 3. _get_instance_volume_block_device_info The structure for this method is: def _get_instance_volume_block_device_info(self, context, instance, refresh_conn_info=False, bdms=None): if not bdms: bdms = (block_device_obj.BlockDeviceMappingList. get_by_instance_uuid(context, instance['uuid'])) block_device_mapping = ( driver_block_device.convert_volumes(bdms) + driver_block_device.convert_snapshots(bdms) + driver_block_device.convert_images(bdms)) .... block_device_obj.BlockDeviceMappingList.get_by_instance_uuid() goes and queries the database to construct the bdms, which will contain stale data. To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1304695/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
