diff --git a/sysom_api/service_scripts/iosdiag_latency b/sysom_api/service_scripts/iosdiag_latency
index 51503ee0ca560b83e1b1849a5a0116c9ff7c47b6..ca638eef70ca3ccd1cd236f487c11032183af14c 100755
--- a/sysom_api/service_scripts/iosdiag_latency
+++ b/sysom_api/service_scripts/iosdiag_latency
@@ -41,7 +41,7 @@ if int(cmd0_arg_T) <= 0:
 cmd0_arg_device = args.get("目标磁盘","")
 dump_log_cmd = "cat /var/log/sysak/iosdiag/latency/result.log.stat 2>/dev/null;\
     echo \"\";cat /var/log/sysak/iosdiag/latency/result.log.seq 2>/dev/null;"
-iosdiag_cmd = "sysak iosdiag latency -t "+str(cmd0_arg_t)+" -T "+str(cmd0_arg_T)+" "+cmd0_arg_device+" > /dev/null"
+iosdiag_cmd = "sysak iosdiag latency -t "+str(cmd0_arg_t)+" -T "+str(cmd0_arg_T)+" "+cmd0_arg_device+" > /dev/null 2>&1"
 print_result_cmd = "if [ \"$?\" = \"0\" ]; then "+\
     dump_log_cmd+"else echo \"fail\"; fi"
 cmd0['cmd'] = "rm /var/log/sysak/iosdiag/latency/* -f && "+iosdiag_cmd+" && "+print_result_cmd