Blinks the locate led if your disk shelf and HBA supports it. Tested on a NetApp DS4243 (IOM6 module) + LSI SAS 9200-8E.

blink_led

#!/bin/bash

# USAGE
# blink_led <device> that exists as /dev/disk/by-id/<device>

# you should use by-id mounts in zfs (instead of /dev/sda etc)
# so copying that directly when at a faulted state (for example) 
# should be enough. if you use by-vdev, edit the script to suit
# your needs.

BLOCKDEVICE=$(basename $(readlink -f /dev/disk/by-id/$1))
BLINKDEVICE=/sys/class/enclosure/*/*/device/block/$BLOCKDEVICE/../../enclosure*/locate
LEDSTATUS=$(cat $BLINKDEVICE)
((LEDSTATUS = !LEDSTATUS))

echo "Echoing $LEDSTATUS to $BLINKDEVICE ..."
echo $LEDSTATUS > $BLINKDEVICE