t.numWorkers++
	}

	for t.numWorkers > n {
		go func() { t.killCh <- struct{}{} }()
		t.numWorkers--
	}
}

var errInvalidStorageClass = errors.New("invalid storage class")

func validateTransitionTier(lc *lifecycle.Lifecycle) error {
	for _, rule := range lc.Rules {
		if rule.Transition.StorageClass != "" {
			if valid := globalTierConfigMgr.IsTierValid(rule.Transition.StorageClass); !valid {