调整默认EC参数

sdks/storage/models.go

@@ -75,7 +75,7 @@ func (b *RepRedundancy) Value() (driver.Value, error) {
 	return serder.ObjectToJSONEx[Redundancy](b)
 }
 
-var DefaultECRedundancy = *NewECRedundancy(3, 6, 1024*1024*5)
+var DefaultECRedundancy = *NewECRedundancy(2, 3, 1024*1024*5)
 
 type ECRedundancy struct {
 	serder.Metadata `union:"ec"`