diff --git a/sdks/storage/models.go b/sdks/storage/models.go
index b1dad0c..9a79cd6 100644
--- a/sdks/storage/models.go
+++ b/sdks/storage/models.go
@@ -128,6 +128,10 @@ type Node struct {
 	LastReportTime   *time.Time `db:"LastReportTime" json:"lastReportTime"`
 }
 
+func (n Node) String() string {
+	return fmt.Sprintf("%v(%v)", n.Name, n.NodeID)
+}
+
 type PinnedObject struct {
 	ObjectID   ObjectID  `db:"ObjectID" json:"objectID"`
 	NodeID     NodeID    `db:"NodeID" json:"nodeID"`
diff --git a/utils/sync2/sync2.go b/utils/sync2/sync2.go
index aa6bd50..8555a3b 100644
--- a/utils/sync2/sync2.go
+++ b/utils/sync2/sync2.go
@@ -2,12 +2,11 @@ package sync2
 
 import (
 	"sync"
-	"sync/atomic"
 )
 
 func ParallelDo[T any](args []T, fn func(val T, index int) error) error {
-	err := atomic.Value{}
-	err.Store((error)(nil))
+	lock := sync.Mutex{}
+	var err error
 
 	var wg sync.WaitGroup
 	wg.Add(len(args))
@@ -16,10 +15,15 @@ func ParallelDo[T any](args []T, fn func(val T, index int) error) error {
 			defer wg.Done()
 
 			if e := fn(arg, index); e != nil {
-				err.CompareAndSwap((error)(nil), e)
+				lock.Lock()
+				if err == nil {
+					err = e
+				}
+				lock.Unlock()
 			}
 		}(arg, i)
 	}
 	wg.Wait()
-	return err.Load().(error)
+
+	return err
 }