diff --git a/ansible/roles/tsg-os-HAL/files/script/tsg-os-HAL.sh b/ansible/roles/tsg-os-HAL/files/script/tsg-os-HAL.sh
index 354c9b9b..c3af23aa 100644
--- a/ansible/roles/tsg-os-HAL/files/script/tsg-os-HAL.sh
+++ b/ansible/roles/tsg-os-HAL/files/script/tsg-os-HAL.sh
@@ -288,7 +288,7 @@ read_device_type()
 read_sn()
 {
     if [ ${DEVICE_TYPE} == "9000-NPB" ]; then
-        SN=`ipmitool fru -t 130 | awk 'NR==12' | awk '{ print $4}'`
+        SN=`ipmitool fru -t 130 | grep 'Product Serial' | awk '{ print $4}' | head -n 1`
     else
         SN=`ipmitool fru list | grep 'Product Serial' | awk '{ print $4}' | head -n 1`
     fi
@@ -298,6 +298,18 @@ read_sn()
     fi
 }
 
+retry_read_sn_when_sn_unavailable()
+{
+    retry_max_count=10
+    i=1
+    until [ $i -gt $retry_max_count ] || [ $SN != "unknown" ]
+    do
+        sleep $((RANDOM % 6 + 1))
+        read_sn
+        ((i++))
+    done
+}
+
 add_node_metadata()
 {
     local node_name="localhost"
@@ -342,4 +354,5 @@ set_mrzcpd_conf
 # add sn to k8s node annotations.
 read_device_type
 read_sn
+retry_read_sn_when_sn_unavailable
 add_node_metadata