问题处理：kolla环境在 cinder-backup备份还原后是个空卷

对卷id 75eb3e08-924f-4bf2-b403-6aebf4df48de 做备份：

cinder backup-create 75eb3e08-924f-4bf2-b403-6aebf4df48de  --name wy_volume1_backup5 --force

执行结果.png

但是日志里显示attach_info['volume_id'] = '1c13b2a5-fbd6-401f-801a-6bd2aa5b9a2c'

日志.png

卷'1c13b2a5-fbd6-401f-801a-6bd2aa5b9a2c'看起来是nova创建的，而且deleted了：

1c13b2a5-fbd6-401f-801a-6bd2aa5b9a2c.png

原因：代码里获取备份设备的时候，判断如果原卷状态是in-use，则创建一个快照卷，‘1c13b2a5-fbd6-401f-801a-6bd2aa5b9a2c’就是新建的快照的卷id。

获取备份设备：
cinder.volume.driver.BaseVD#get_backup_device

    def get_backup_device(self, context, backup):
        """Get a backup device from an existing volume.

        The function returns a volume or snapshot to backup service,
        and then backup service attaches the device and does backup.
        """
        backup_device = None
        is_snapshot = False
        if self.backup_use_temp_snapshot() and CONF.backup_use_same_host:
            (backup_device, is_snapshot) = (
                self._get_backup_volume_temp_snapshot(context, backup))
        else:
            
            backup_device = self._get_backup_volume_temp_volume(
                context, backup)
            is_snapshot = False

cinder.volume.driver.BaseVD#_get_backup_volume_temp_volume

    def _get_backup_volume_temp_volume(self, context, backup):
        """Return a volume to do backup.

        To backup a snapshot, create a temp volume from the snapshot and
        back it up.

        Otherwise to backup an in-use volume, create a temp volume and
        back it up.
        """

妈的线索又断了。。。。