Lustre discuss - Jan 2009 - How to probe a Lustre client in Nagios?

Dear list,
    We have right now mount around 100 Lustre clients. Is there any way to probe
Lustre clients in Nagios? I have tried this scripe:
   #!/bin/bash
OK=0
WARN=1
CRITICAL=2
UNKNOWN=3
PATH="/bin:/sbin:/usr/bin:/usr/sbin"

if [ -e /besfs/offline/testfs ]
then
        echo "lustre is OK"
        exit $OK
else
        echo "lustre:besfs/offline is Warning"
        exit $WARN
fi

However, after a recovery of Lustre , the nagios status doesn''t recover
on some machines. unless execute the scripe on these machines, or restart nagios
clients.
 Dose Lustre cache some metadata? 
 				
--------------
Lu Wang
2009-01-05