Synnefo » snf-ganeti

    if self.op.enabled_storage_types:

      cluster = self.cfg.GetClusterInfo()

      instances = self.cfg.GetAllInstancesInfo()

      storage_types_to_remove = set(cluster.enabled_storage_types) \

        - set(self.op.enabled_storage_types)

      for instance in instances.itervalues():

        storage_type = constants.DISK_TEMPLATES_STORAGE_TYPE[

                         instance.disk_template]

        if storage_type in storage_types_to_remove:

          raise errors.OpPrereqError("Cannot disable storage type '%s',"

                                     " because instance '%s' is using disk"

                                     " template '%s'." %

                                     (storage_type, instance.name,

                                      instance.disk_template))