diff --git a/kvmstats.sh b/kvmstats.sh
index 8be1242..16676ad 100644
--- a/kvmstats.sh
+++ b/kvmstats.sh
@@ -56,6 +56,7 @@ do
         case $DEV in
         /dev/drbd/*)
             DISK=$(cat $LVSOUT | awk "/$VM/ { ans += \$NF } END { print ans / 1024 ^ 3 }")
+            break # avoid to compute DISK for each disk
             ;;
         *.qcow2)
             DISK=$(du -sBG $DEV | awk '{ print substr($1, 0, length($1) - 1) }')