diff --git a/utils/benchmark_io.sh b/utils/benchmark_io.sh
index 027170f..5015483 100755
--- a/utils/benchmark_io.sh
+++ b/utils/benchmark_io.sh
@@ -1,15 +1,17 @@
 #!/bin/bash
 
+CMD_W='sync; dd if=/dev/zero of=/var/repo/test bs=1M count=100 2>&1; sync'
+CMD_R='sysctl -w vm.drop_caches=3; dd if=/var/repo/test of=/dev/null bs=1M count=100 2>&1'
+INSTANCES=$(echo -n c4science-app0{0..1}; echo -n " c4science-phd00")
+
 echo "> Write 100M"
-CMD='sync; dd if=/dev/zero of=/var/repo/test bs=1M count=100 2>&1; sync'
-for n in {0..1}; do
-    echo -en "    c4science-app0$n: "
-    ssh c4science-app0$n "$CMD" 2> /dev/null | grep copied | awk '{print $6 " sec, ", $8, $9}'
+for n in $INSTANCES; do
+    echo -en "    $n: "
+    ssh $n "$CMD_W" 2> /dev/null | grep copied | awk '{print $6 " sec, ", $8, $9}'
 done
 
 echo "> Read 100M"
-CMD='sysctl -w vm.drop_caches=3; dd if=/var/repo/test of=/dev/null bs=1M count=100 2>&1'
-for n in {0..1}; do
-    echo -en "    c4science-app0$n: "
-    ssh c4science-app0$n "$CMD" 2> /dev/null | grep copied | awk '{print $6 " sec, ", $8, $9}'
+for n in $INSTANCES; do
+    echo -en "    $n: "
+    ssh $n "$CMD_R" 2> /dev/null | grep copied | awk '{print $6 " sec, ", $8, $9}'
 done