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This is taken directly from Netapp Now website. Really useful for Netapp Administrator

How to locate a failed disk drive using disk LEDs
View Environment section
Symptoms
How to identify a broken or defective disk
Disk broke or failed and the LED is not red
Identify the slot in which a faulty disk drive resides
How to locate a failed disk drive using disk LEDs
Keywords : blink, flash, drive, shelf slot
Cause of this problem
Disk failed and red LED is not automatically illuminating.
Solution
To physically locate a disk using the disk’s LED, follow these steps. You may substitute ‘blink_on’ and ‘blink_off’ with ‘led_on’ and ‘led_off’.
To enable and disable disk LED blinking (this example uses disk 0a.19):
1. Access advanced commands:
For Data ONTAP 6.0 and later, type: priv set advanced
For earlier releases, type: rc_toggle_basic
2. To enable LED blinking:
blink_on 0a.19
The left LED on the disk will start blinking.

Note: If this is being used for MetroCluster, use the disk name and disk ID. For example:
blink_on :
3. To disable LED blinking:
blink_off 0a.19
The left LED on the disk will stop blinking.
4. Exit advanced commands:
For Data ONTAP 6.0 and later, type: priv set
For earlier releases, type: rc_toggle_basic
If the disk is broken and the red LED does not illuminate, turn on the disk LEDs adjacent to the defective disk. For example, if disk 4.19 fails and its red LED does not turn on, enter the following series of commands:
1. Access advanced commands:
For Data ONTAP 6.0 and later, type: priv set advanced
For earlier releases, type: rc_toggle_basic
2. Turn on the LEDs adjacent to the failed disk:
led_on 0a.18
led_on 0a.20
Disks 0a.18 and 0a.20 LEDs will be illuminated.
3. Turn off LEDs:
led_off 0a.18
led_off 0a.20
4. Exit advanced commands:
For Data ONTAP 6.0 and later, type: priv set
For earlier releases, type: rc_toggle_basic
• Note:
For Data ONTAP GX, you can enter the following command to cause the led on the left side of the drive to illuminate amber:

storage disk setled -disk -action on
If the disk is failed to the point that the led will not illuminate, turn on the LEDs to the disks adjacent to the one reporting this error.
The following are other useful commands to locate disks:
• To find the position of disks, type: fcstat device_map
• To list spare disks, type: vol status -s
• To list broken disks, type: vol status -f
Refer to Remove failed disks quickly from NetApp Best Practices for Reliability and to the respective hardware and service guidefor each storage appliance.
Note: For disks in a Fibre Channel fabric, the FC switch name is case sensitive. If the ‘sysconfig -a’ shows the disk ID as “KHHQ-R-SW02BSW2:7.20″, the command would be:
blink_on KHHQ-R-SW02BSW2:7.20
Not:
blink_on
khhq-r-sw02bsw2:7.20

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