"b" command in a crontab

You could add logging to the script to see what it's doing. Replace the existing script with this named /root/ramcache.clear.bash

 Save the output file name as the script name 
OUT=/var/log/`basename $0`.out

 Print the date and script name
echo "`date +%Y%m%d_%H%M%S`: `basename $0`: starting" >> $OUT

 List the current RAM cache entries for one HTTP profile
echo "Entries before delete:" >> $OUT
b profile http MY_HTTP_PROFILE ramcache entry show >> $OUT

 Delete current RAM cache entries for one HTTP profile
b profile http MY_HTTP_PROFILE ramcache entry all delete

 List the current RAM cache entries for one HTTP profile
echo "Entries after delete:" >> $OUT
b profile http MY_HTTP_PROFILE ramcache entry show >> $OUT

And then remove the existing crontab entry and add this:

At 9:10 and 11:10, run the ramcache clear script on the active unit

10 9,11 * * * if [ `/bin/ps1` == "Active" ]; then /root/ramcache.clear.bash > /var/log/ramcache.clear.bash.out 2>&1; fi

The output will be logged to /var/log/ramcache.clear.bash.

Aaron