diff --git a/drivers/aliyundrive_open/util.go b/drivers/aliyundrive_open/util.go
index bef6fed696c..37895b8a948 100644
--- a/drivers/aliyundrive_open/util.go
+++ b/drivers/aliyundrive_open/util.go
@@ -44,6 +44,7 @@ func (d *AliyundriveOpen) refreshToken() error {
 	if refresh == "" {
 		return errors.New("failed to refresh token: refresh token is empty")
 	}
+	log.Infof("[ali_open] toekn exchange: %s -> %s", d.RefreshToken, refresh)
 	d.RefreshToken, d.AccessToken = refresh, access
 	op.MustSaveDriverStorage(d)
 	return nil
diff --git a/internal/conf/config.go b/internal/conf/config.go
index 06a6973a3a2..67c2dc0fa56 100644
--- a/internal/conf/config.go
+++ b/internal/conf/config.go
@@ -83,8 +83,8 @@ func DefaultConfig() *Config {
 		Log: LogConfig{
 			Enable:     true,
 			Name:       logPath,
-			MaxSize:    10,
-			MaxBackups: 5,
+			MaxSize:    50,
+			MaxBackups: 30,
 			MaxAge:     28,
 		},
 		MaxConnections:        0,