diff --git a/joj3_config_generator/processers/repo.py b/joj3_config_generator/processers/repo.py
index f6320f9..90617a0 100644
--- a/joj3_config_generator/processers/repo.py
+++ b/joj3_config_generator/processers/repo.py
@@ -40,7 +40,7 @@ def get_health_check_args(repo_conf: repo.Config) -> List[str]:
         "-root=.",
         f"-repoSize={str(repo_conf.max_size)}",
         *[f"-meta={meta}" for meta in repo_conf.files.required],
-        get_hash(repo_conf),
+        f"-checkFileSumList={','.join(get_hashs(repo_conf))}",
         f"-checkFileNameList={','.join(repo_conf.files.immutable)}",
     ]
 
@@ -97,16 +97,15 @@ def get_health_check_stage(repo_conf: repo.Config) -> result.StageDetail:
 def calc_sha256sum(file_path: Path) -> str:
     sha256_hash = hashlib.sha256()
     with open(file_path, "rb") as f:
-        for byte_block in iter(lambda: f.read(65536 * 2), b""):
+        for byte_block in iter(lambda: f.read(64 * 1024), b""):
             sha256_hash.update(byte_block)
     return sha256_hash.hexdigest()
 
 
-def get_hash(repo_conf: repo.Config) -> str:  # input should be a list
+def get_hashs(repo_conf: repo.Config) -> List[str]:
     base_dir = (repo_conf.root / repo_conf.path).parent
     immutable_dir = base_dir / "immutable_files"
     immutable_files = [
         immutable_dir / Path(file).name for file in repo_conf.files.immutable
     ]
-    immutable_hash = [calc_sha256sum(file) for file in immutable_files]
-    return f"-checkFileSumList={','.join(immutable_hash)}"
+    return [calc_sha256sum(file) for file in immutable_files]