Nice !

It works well but there was a little problem in the perfdatas (see http://nagiosplug.sourceforge.net/developer-guidelines.html#AEN201).

I modified it to suit my needs (and corrected perfdata) :
$perfdata=sprintf(“Read=%.2fMB/s Write=%.2fMB/s Read=%.2fIO/s Write=%.2fIO/s Total=%.2fIO/s;%d;%d”,$IONReadMBsec,$IONWrittenMBsec,$IOReadssec,$IOWritessec,$dskIOTotal,$opt_warn,$opt_crit);

Thanks for the plugin 🙂