diff --git a/benchmark/config.sh b/benchmark/config.sh
index 9082b5f7b..616d54096 100755
--- a/benchmark/config.sh
+++ b/benchmark/config.sh
@@ -10,7 +10,7 @@ if [[ "isc17" == ${hostname:0:5} ]]; then
     module load ddn/mvapich/3.1.4
     module load root/hdf5/1.10.4
     module load root/ior/git-20181107
-    module list
+    #module list
     export TD="/esfs/jtacquaviva/testfiles"
     export WD="/esfs/jtacquaviva/git/ddn-ime-evaluation/benchmark"
     export NODES=( isc17-c04 isc17-c05 isc17-c02 isc17-c03 isc17-c05 isc17-c06 isc17-c07 isc17-c08 isc17-c09 isc17-c12 isc17-c13 isc17-c14 isc17-c15 isc17-c18 isc17-c22 isc17-c01 )
@@ -24,23 +24,26 @@ elif [[ "m" == ${hostname:0:1} ]]; then
     module load bullxmpi_mlx_mt/bullxmpi_mlx_mt-1.2.9.2
     module load k202107/hdf5/1.10.4
     module load k202107/ior/git-20181108
-    module list
+    #module list
     export TD="/mnt/lustre01/work/ku0598/k202107/git/ddn-ime-evaluation/benchmark/wd"
     export WD="/mnt/lustre01/work/ku0598/k202107/git/ddn-ime-evaluation/benchmark"
     export NODES=()
 else
-    echo "Configuration faile: Cluster $hostname is not supported. Quitting."
+    echo "Configuration failed: Cluster $hostname is not supported. Quitting."
     exit 1
 fi
 
 
 # Lustre cache on DDN cluster ist 32108MB. Test file has to be at least twice as large therefore: DATASIZE = 76800MB
-DATASIZE=$((4800 * 1024 * 1024 * 16))
+#DATASIZE=$((4800 * 1024 * 1024 * 16))
+DATASIZE=$((48000 * 1024 * 1024 * 16))
 
 COUNT_ARR=( $(seq 3) )
-TYPE_ARR=( "read" "write" )
-API_ARR=( "MPIIO" "POSIX")
-NN_ARR=( 1 2 4 8 16)
+TYPE_ARR=( "write" "read" )
+API_ARR=( "POSIX") # "MPIIO" ) #
+#API_ARR=( "MPIIO" ) #
+#NN_ARR=( 1 2 4 8 16)
+NN_ARR=( 2 1)
 PPN_ARR=( 8 4 1 )
 T_ARR=( $((10*1024*1024)) $((1*1024*1024)) $((100*1024)) $((16*1024)) )
 
diff --git a/benchmark/drop_caches.sh b/benchmark/drop_caches.sh
index 4ca42ffdb..571e48db0 100755
--- a/benchmark/drop_caches.sh
+++ b/benchmark/drop_caches.sh
@@ -1,18 +1,16 @@
 #!/bin/bash
 
 oscs=( $( find /proc/fs/lustre/osc -mindepth 1 -maxdepth 1 -type d  ) )
-echo $oscs
+#echo $oscs
 
 while [ ! 0 -eq ${#oscs[@]} ]; do
-    set -x
     sync
     echo 3 > /proc/sys/vm/drop_caches 
-    set +x
 
     for i in ${!oscs[@]}; do
         used_mb=$( grep -h used_mb ${oscs[$i]}/osc_cached_mb | cut -d" " -f 2 )
         if [ 0 == $used_mb ]; then
-            echo "remove from list ${oscs[$i]}, because cache is $used_mb MB"
+            #echo "remove from list ${oscs[$i]}, because cache is $used_mb MB"
             unset oscs[$i]
         else
             echo "skip ${oscs[$i]}, cache is still $used_mb MB"
diff --git a/benchmark/ior_wrapper.sh b/benchmark/ior_wrapper.sh
index 91220697e..4f5b664a1 100755
--- a/benchmark/ior_wrapper.sh
+++ b/benchmark/ior_wrapper.sh
@@ -7,11 +7,9 @@ NETOUTDIR=$2
 HOST="$hostname"
 PID=$$
 
-NETOUTFILE="$NETOUTDIR/HOST:$HOST#PID:$PID.txt"
+NETOUTFILE="$NETOUTDIR/HOST:$HOST-PID:$PID-LABEL:"
 
 function capture_network_state {
-    label=$1
-    echo "LABEL $label"
     echo "TIMESTAMP $(date +%s)"
     perfquery -x
     cat /proc/net/dev
@@ -19,7 +17,8 @@ function capture_network_state {
     cat /proc/fs/lustre/llite/esfs-*/max_cached_mb
 }
 
-echo "" > $NETOUTFILE
-echo "$( capture_network_state "START" )" &>> $NETOUTFILE
+echo "$( capture_network_state )" &> "${NETOUTFILE}start.txt"
 $IOR $IOR_PARAMS
-echo "$( capture_network_state "STOP" )" &>> $NETOUTFILE
+echo "$( capture_network_state )" &> "${NETOUTFILE}stop.txt"
+
+exit 0
diff --git a/benchmark/prepare.sh b/benchmark/prepare.sh
index f6c7d91f6..e7b1c3cb5 100755
--- a/benchmark/prepare.sh
+++ b/benchmark/prepare.sh
@@ -2,30 +2,26 @@
 
 . ./config.sh
 
-NODES='isc17-c02,isc17-c03,isc17-c04,isc17-c05,isc17-c06,isc17-c07,isc17-c08,isc17-c09,isc17-c11,isc17-c12,isc17-c13,isc17-c14,isc17-c15,isc17-c18,isc17-c22,isc17-c01'
+NODES='isc17-c04,isc17-c05,isc17-c02,isc17-c03,isc17-c06,isc17-c07,isc17-c08,isc17-c09,isc17-c11,isc17-c12,isc17-c13,isc17-c14,isc17-c15,isc17-c18,isc17-c22,isc17-c01'
 
 
-#for NN in ${NN_ARR[@]}; do 
-
-for NN in 1; do 
+for NN in ${NN_ARR[@]}; do 
     LUSTRE_TESTFILE="$TD/sharedread${NN}/file"
-    TESTDIR="$(dirname $LUSTRE_TESTFILE)"
-    mkdir $TESTDIR
-    lfs setstripe -c $(($NN * 2)) $TESTDIR
+    if [ ! -f $LUSTRE_TESTFILE ]; then 
+        TESTDIR="$(dirname $LUSTRE_TESTFILE)"
+        mkdir $TESTDIR
+        lfs setstripe -c $(($NN * 2)) $TESTDIR
 
-    MPIEXEC_PARAMS="-ppn 8 -np $((8*$NN)) -hosts isc17-c04,isc17-c05 "
-    MPIEXEC_PARAMS+="-genv MV2_NUM_HCAS 1 -genv MV2_CPU_BINDING_LEVEL core -genv MV2_CPU_BINDING_POLICY scatter"
+        MPIEXEC_PARAMS="-ppn 8 -np $((8*$NN)) -hosts $NODES "
+        MPIEXEC_PARAMS+="-genv MV2_NUM_HCAS 1 -genv MV2_CPU_BINDING_LEVEL core -genv MV2_CPU_BINDING_POLICY scatter"
 
-    IOR_PARAMS="-i 1 -s 1 -t $((16 * 1024 * 1024)) -b $(($DATASIZE / 8)) -o $LUSTRE_TESTFILE -a MPIIO -e -g -k "
-    IOR_PARAMS+="-D 60 -O stoneWallingWearOut=1 "
+        IOR_PARAMS="-i 1 -s 1 -t $((16 * 1024 * 1024)) -b $(($DATASIZE / 8)) -o $LUSTRE_TESTFILE -a MPIIO -e -g -k "
+        #IOR_PARAMS+="-D 60 -O stoneWallingWearOut=1 "
 
-    ./drop_caches.sh
-    set +x
-    $MPIEXEC $MPIEXEC_PARAMS $IOR $IOR_PARAMS -w
-    set -x
+        #./drop_caches.sh
+        set +x
+        $MPIEXEC $MPIEXEC_PARAMS $IOR $IOR_PARAMS -w
+        set -x
 
-#    ./drop_caches.sh
-#    set +x
-#    $MPIEXEC $MPIEXEC_PARAMS $IOR $IOR_PARAMS -r
-#    set -x
+    fi
 done
diff --git a/benchmark/run_v2.sh b/benchmark/run_v2.sh
index 7ffad920c..004c423a3 100755
--- a/benchmark/run_v2.sh
+++ b/benchmark/run_v2.sh
@@ -1,6 +1,5 @@
 #!/bin/bash 
 
-
 function force_exit {
     echo "Committing suicide (PID $$)"
     exit
@@ -27,45 +26,47 @@ for NN in ${NN_ARR[@]}; do
 for T in ${T_ARR[@]}; do 
 for PPN in ${PPN_ARR[@]}; do 
 for API in ${API_ARR[@]}; do 
+    BENCHFILE="./output_v2/COUNT:$COUNT-NN:$NN-PPN:$PPN-API:$API-T:$T-TYPE:$TYPE.txt"
 
-    BENCHFILE="./output_v2/COUNT:$COUNT#NN:$NN#PPN:$PPN#API:$API#T:$T#TYPE:$TYPE.txt"
-
-    #if [ ! -e "${BENCHFILE}" ]; then
-    if true; then
+    if [ ! -e "${BENCHFILE}" ]; then
         OUTDIR="$(dirname $BENCHFILE)"
         [ ! -d $OUTDIR ] && mkdir $OUTDIR
         touch $BENCHFILE
 
-        IOR_TYPE_OPTS=""
         if [[ "read" == $TYPE ]]; then
-            IOR_TYPE_OPTS="-r"
+            IOR_TYPE_OPTS="-r -E -k"
             LUSTRE_TESTFILE="$TD/sharedread$NN/file"
             TESTDIR="$(dirname $LUSTRE_TESTFILE)"
             lfs getstripe $TESTDIR | tee -a $BENCHFILE
-
         elif [[ "write" == $TYPE ]]; then
             IOR_TYPE_OPTS="-w"
-            LUSTRE_TESTFILE="$TD/sharedwrite/file"
+            LUSTRE_TESTFILE="$TD/sharedwrite$NN/file"
             TESTDIR="$(dirname $LUSTRE_TESTFILE)"
-            [ -d $TESTDIR ] && rm -r $TESTDIR || mkdir -p $TESTDIR 
+            [ -d $TESTDIR ] && rm -r $TESTDIR 
+            mkdir -p $TESTDIR 
             lfs setstripe	-c $((2 * $NN)) $TESTDIR
             lfs getstripe $TESTDIR | tee -a $BENCHFILE
         fi
 
         IOR_PARAMS="-i 1 "
-        IOR_PARAMS+="-s 1 -t $T -b $((4800 * 1024 * 1024 * 32 / $PPN)) "
+        IOR_PARAMS+="-s 1 -t $T -b $(($DATASIZE / $PPN)) "
         IOR_PARAMS+="-D 60 -O stoneWallingWearOut=1 "
         IOR_PARAMS+="-a $API "
-        IOR_PARAMS+="-e -g -z -k -o $LUSTRE_TESTFILE $IOR_TYPE_OPTS "
+        #IOR_PARAMS+="-p " # preallocate -- preallocate file size
+        #IOR_PARAMS+="-e " # fsync -- perform sync operation after each block write
+        IOR_PARAMS+="-g " # intraTestBarriers -- use barriers between open, write/read, and close
+        IOR_PARAMS+="-H " # showHints -- show hints 
+        IOR_PARAMS+="-z " # randomOffset -- access is to random, not sequential, offsets within a file
+        IOR_PARAMS+="-o $LUSTRE_TESTFILE $IOR_TYPE_OPTS "
+        IOR_PARAMS+="-O summaryFile=${BENCHFILE}.json "
+        IOR_PARAMS+="-O summaryFormat=JSON "
         
         if [[ "isc17" == ${hostname:0:5} ]]; then
             $MPIEXEC -np $NN --hosts $(hosts $NN) ./drop_caches.sh
-
             MPIEXEC_PARAMS=" -ppn $PPN -np $(($NN * $PPN)) --hosts $(hosts $NN) -wdir $WD "
             MPIEXEC_PARAMS+="-genv MV2_NUM_HCAS 1 "
             MPIEXEC_PARAMS+="-genv MV2_CPU_BINDING_LEVEL core "
             MPIEXEC_PARAMS+="-genv MV2_CPU_BINDING_POLICY scatter "
-
         elif [[ "m" == ${hostname:0:1} ]]; then
             #MPIEXEC_PARAMS=" -ppn $PPN -n $(($NN * $PPN)) -wdir $WD --host $(hosts $NN) "
             MPIEXEC_PARAMS=" -ppn $PPN -n $(($NN * $PPN)) -wdir $WD "
@@ -74,12 +75,11 @@ for API in ${API_ARR[@]}; do
             exit 1
         fi
 
+        NETOUTDIR="${BENCHFILE}_network"
+        [[ ! -d $NETOUTDIR ]] && mkdir $NETOUTDIR || rm $NETOUTDIR/HOST*PID*.txt
+
         (
         set -x
-        NETOUTDIR="${BENCHFILE}_network"
-echo $NETjOUTDIR
-        [[ ! -d $NETOUTDIR ]] && mkdir $NETOUTDIR || rm $NETOUTDIR/HOST*PID*.txt
-        
         $MPIEXEC $MPIEXEC_PARAMS ./ior_wrapper.sh "$IOR_PARAMS" "$NETOUTDIR" | tee -a $BENCHFILE
         #$MPIEXEC $MPIEXEC_PARAMS $IOR $IOR_PARAMS | tee -a $BENCHFILE
         set +x