diff --git a/weed/util/chunk_cache/on_disk_cache_layer.go b/weed/util/chunk_cache/on_disk_cache_layer.go
index b004913ef..3a656110e 100644
--- a/weed/util/chunk_cache/on_disk_cache_layer.go
+++ b/weed/util/chunk_cache/on_disk_cache_layer.go
@@ -96,7 +96,7 @@ func (c *OnDiskCacheLayer) getChunkSlice(needleId types.NeedleId, offset, length
 			continue
 		}
 		if err != nil {
-			glog.Errorf("failed to read cache file %s id %d", diskCache.fileName, needleId)
+			glog.Warningf("failed to read cache file %s id %d: %v", diskCache.fileName, needleId, err)
 			continue
 		}
 		if len(data) != 0 {