diff --git a/source/libs/sync/src/syncRaftCfg.c b/source/libs/sync/src/syncRaftCfg.c
index b4bacd245197c5f389caa0e54c59359effd51c6c..806949c81e2ad8598a7d2901769c53a0bfa2daa8 100644
--- a/source/libs/sync/src/syncRaftCfg.c
+++ b/source/libs/sync/src/syncRaftCfg.c
@@ -71,22 +71,22 @@ int32_t syncWriteCfgFile(SSyncNode *pNode) {
   char        file[PATH_MAX] = {0};
   snprintf(file, sizeof(file), "%s.bak", realfile);
 
-  pFile = taosOpenFile(file, TD_FILE_CREATE | TD_FILE_WRITE | TD_FILE_TRUNC);
-  if (pFile == NULL) goto _OVER;
-
   terrno = TSDB_CODE_OUT_OF_MEMORY;
   pJson = tjsonCreateObject();
   if (pJson == NULL) goto _OVER;
   if (tjsonAddObject(pJson, "RaftCfg", syncEncodeRaftCfg, pCfg) < 0) goto _OVER;
-
   buffer = tjsonToString(pJson);
   if (buffer == NULL) goto _OVER;
+  terrno = 0;
+
+  pFile = taosOpenFile(file, TD_FILE_CREATE | TD_FILE_WRITE | TD_FILE_TRUNC);
+  if (pFile == NULL) goto _OVER;
 
   int32_t len = strlen(buffer);
   if (taosWriteFile(pFile, buffer, len) <= 0) goto _OVER;
   if (taosFsyncFile(pFile) < 0) goto _OVER;
-  taosCloseFile(&pFile);
 
+  taosCloseFile(&pFile);
   if (taosRenameFile(file, realfile) != 0) goto _OVER;
 
   code = 0;
@@ -98,6 +98,7 @@ _OVER:
   if (pFile != NULL) taosCloseFile(&pFile);
 
   if (code != 0) {
+    if (terrno == 0) terrno = TAOS_SYSTEM_ERROR(errno);
     sError("vgId:%d, failed to write sync cfg file:%s since %s", pNode->vgId, realfile, terrstr());
   }
   return code;