diff --git a/install-dsmon.sh b/install-dsmon.sh
index 500111d..93255d3 100755
--- a/install-dsmon.sh
+++ b/install-dsmon.sh
@@ -112,7 +112,7 @@ crontab -l | grep -v 'dsmon sys'  | crontab -
 sleep 1s
 (crontab -l ; echo "$(($RANDOM % 59)) */1 * * * /usr/local/bin/dsmon hdd >/dev/null 2>&1")| crontab -
 sleep 1s
-(crontab -l ; echo "*/5 * * * * /usr/local/bin/dsmon sys >/dev/null 2>&1")| crontab -
+(crontab -l ; echo "*/5+$(($RANDOM % 4)) * * * * /usr/local/bin/dsmon sys >/dev/null 2>&1")| crontab -
 
 
 if [ "${SET_SERVERMONID}" = "new" ]; then