Disk is predictive failure but LED is showing green.

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http://www.unix.com – Hi Linux Team we use hpacucli ctrl all show config command find out the failure disk. Here command output is showing predictive failure but The Datacenter team are unable to find the correct failure disk. From Datacenter all LEDs are showing green. Datacenter asks us to blink the LED. How to blink the LED? what is the command to use. (HowTos)