You are using @exec to get variables, this is disabled on most production servers.
$buh = strtok( exec( "cat /proc/uptime" ), "." );
Consider using PHP functions:
sys_getloadavg() will return the load average as an array.
Uptime could be got through mysql:
function db_stats(){
global $wpdb;
return mysql_stat();
}return this:
Uptime: 73080 Threads: 1 Questions: 6849 Slow queries: 0 Opens: 79 Flush tables: 1 Open tables: 64 Queries per second avg: 0.93
http://wordpress.org/extend/plugins/wp-really-simple-health-10/
