Check manual page of emc_isilon_iops
EMC Isilon: Disk Operations per Second (IOPS)
Reports the Disk Operations per Second (IOPS) of Disks in EMC Isilon
This check always returns OK
The diskPerfDeviceName as reported by SNMP, e. g. "bay 4"
Finds exactly one service per disk in an EMC Isilon Storage.