diff --git a/seaweed-volume/src/server/grpc_server.rs b/seaweed-volume/src/server/grpc_server.rs
index 29f8ba53c..e1df47dfe 100644
--- a/seaweed-volume/src/server/grpc_server.rs
+++ b/seaweed-volume/src/server/grpc_server.rs
@@ -2888,7 +2888,11 @@ impl VolumeServer for VolumeGrpcService {
                             )));
                         }
 
-                        // Optionally remove local .dat file
+                        // Close local dat file handle (matches Go's v.LoadRemoteFile
+                        // which closes DataBackend before switching to remote)
+                        vol.close_local_dat_backend();
+
+                        // Optionally remove local .dat file from disk
                         if !keep_local {
                             let dat = vol.dat_path();
                             let _ = std::fs::remove_file(&dat);
diff --git a/seaweed-volume/src/storage/volume.rs b/seaweed-volume/src/storage/volume.rs
index bf0f14d4a..26e9b6834 100644
--- a/seaweed-volume/src/storage/volume.rs
+++ b/seaweed-volume/src/storage/volume.rs
@@ -2084,6 +2084,12 @@ impl Volume {
         }
     }
 
+    /// Close the local .dat file handle (matches Go's v.DataBackend.Close() in LoadRemoteFile).
+    /// Called after tier-upload when the local file is being replaced by remote storage.
+    pub fn close_local_dat_backend(&mut self) {
+        self.dat_file = None;
+    }
+
     /// Path to .vif file.
     fn vif_path(&self) -> String {
         format!("{}.vif", self.data_file_name())