Netapp 7-mode, replace disk.

Indetify the failed disk

controller-b > vol status -f
controller-b > aggr status -f

LED light of the failed disk

controller-b > priv set advanced
controller-b *> led_on 11d.44.1
controller-b *> led_off 11d.44.1

Blink light of the failed disk

controller-b > priv set advanced
controller-b *> blink_on 11d.44.1
controller-b *> blink_off 11d.44.1

Mark disk unfailed

You can also bring back the disk online forcefully, but the same disk may fail again after few hours.

controller-b > priv set diag
controller-b *> disk unfail -s 11d.44.1

Assign disk

controller-b > disk assign 11d.44.1
controller-b > vol status -s
controller-b > vol status -f
controller-b > disk zero spares

Remove owner

controller-b > disk remove_ownership 11d.44.1