diff --git a/tune-profiles/enterprise-storage/ktune.sh b/tune-profiles/enterprise-storage/ktune.sh
index 3cc7527..9664537 100755
--- a/tune-profiles/enterprise-storage/ktune.sh
+++ b/tune-profiles/enterprise-storage/ktune.sh
@@ -14,7 +14,7 @@ start() {
 	nobarriervols=$(echo "$volumes" | grep -v $rootvol | grep -v $bootvol)
 	remount_partitions nobarrier $nobarriervols
 
-	set_disk_readahead 512
+	multiply_disk_readahead 4
 
 	return 0
 }
@@ -31,7 +31,7 @@ stop() {
 	nobarriervols=$(echo "$volumes" | grep -v $rootvol | grep -v $bootvol)
 	remount_partitions barrier $nobarriervols
 
-	set_disk_readahead 128
+	multiply_disk_readahead 0.25
 
 	return 0
 }
diff --git a/tune-profiles/functions b/tune-profiles/functions
index 61fac45..d780c6f 100644
--- a/tune-profiles/functions
+++ b/tune-profiles/functions
@@ -42,13 +42,19 @@ set_disk_spindown() {
 	done
 }
 
-# usage: set_disk_readahead
-set_disk_readahead() {
-	value=$1
+# usage: multiply_disk_readahead by
+multiply_disk_readahead() {
+	by=$1
+
+	# float multiplication not supported in bash
+	# bc might not be installed, python is available for sure
 
 	readaheadvols=$(ls /sys/block/{sd,cciss}*/queue/read_ahead_kb 2>/dev/null)
 	for d in $readaheadvols; do
-		(echo $value > $d) &>/dev/null
+		old=$(cat $d)
+		new=$(echo "print int($old*$by)" | python)
+
+		(echo $new > $d) &>/dev/null
 	done
 }