diff --git a/xCAT-server/share/xcat/ib/scripts/configiba.1port b/xCAT-server/share/xcat/ib/scripts/configiba.1port
index 9f991dd4c..a00b529c5 100755
--- a/xCAT-server/share/xcat/ib/scripts/configiba.1port
+++ b/xCAT-server/share/xcat/ib/scripts/configiba.1port
@@ -87,9 +87,13 @@ else
     #for (( num = 0; num < loop_number; num++ ))
     while [ $num -lt $loop_number ]
     do
-          num1=`expr $num % 2`
-          `rmdev -d -l ib$num`
-          `rmdev -d -l ml$num1`
+          `rmdev -d -l ib$num >/dev/null 2>&1`
+          n=`expr $num % 2`
+          if [ $n == 1 ]
+          then
+               mlnum=`expr $num / 2`
+              `rmdev -d -l ml$mlnum >/dev/null 2>&1`
+          fi
           num=`expr $num + 1`
     done
     
diff --git a/xCAT-server/share/xcat/ib/scripts/configiba.2ports b/xCAT-server/share/xcat/ib/scripts/configiba.2ports
index f36f5df38..4e78028c2 100755
--- a/xCAT-server/share/xcat/ib/scripts/configiba.2ports
+++ b/xCAT-server/share/xcat/ib/scripts/configiba.2ports
@@ -82,9 +82,11 @@ else
     #for (( num = 0; num < loop_number; num++ ))
     while [ $num -lt $loop_number ]
     do
-          num1=`expr $num % 2`
-          `rmdev -d -l ib$num`
-          `rmdev -d -l ml$num1`
+          num0=`expr $num \* 2`
+          num1=`expr $num0 + 1`
+          `rmdev -d -l ib$num0 >/dev/null 2>&1`
+          `rmdev -d -l ib$num1 >/dev/null 2>&1`
+          `rmdev -d -l ml$num >/dev/null 2>&1`
           num=`expr $num + 1`
     done
     
@@ -94,6 +96,7 @@ else
 fi
 
 
+
 HOST=`hostname -s`
 
 num=0