diff --git a/cmd/es-node/utils.go b/cmd/es-node/utils.go
index e47c29e7..2334748d 100644
--- a/cmd/es-node/utils.go
+++ b/cmd/es-node/utils.go
@@ -170,7 +170,7 @@ func createDataFile(cfg *storage.StorageConfig, shardIdxList []uint64, datadir s
 
 		df, err := es.Create(dataFile, startChunkId, chunkPerKv*cfg.KvEntriesPerShard, 0, cfg.KvSize, uint64(encodingType), cfg.Miner, cfg.ChunkSize)
 		if err != nil {
-			log.Error("Creating data file", "error", err)
+			log.Error("Creating data file", "file", dataFile, "error", err)
 			return nil, err
 		}
 		log.Info("Data file created", "shard", shardIdx, "file", dataFile, "kvIdxStart", df.KvIdxStart(), "kvIdxEnd", df.KvIdxEnd(), "miner", df.Miner())
diff --git a/ethstorage/data_file.go b/ethstorage/data_file.go
index 3c27bdfb..95c9a523 100644
--- a/ethstorage/data_file.go
+++ b/ethstorage/data_file.go
@@ -90,12 +90,13 @@ func Create(filename string, chunkIdxStart, chunkIdxLen, epoch, maxKvSize, encod
 
 	file, err := os.Create(filename)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("create file error: " + err.Error())
 	}
+	offset := int64((chunkSize + 32) * chunkIdxLen)
 	// actual initialization is done when synchronize
-	err = fallocate.Fallocate(file, int64((chunkSize+32)*chunkIdxLen), int64(HEADER_SIZE))
+	err = fallocate.Fallocate(file, offset, int64(HEADER_SIZE))
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("fallocate failed. offset=%d, error=%s", offset, err.Error())
 	}
 	dataFile := &DataFile{
 		file:          file,