HPE Nimble Storage HF Series Hardware Manual page 77

Do not remove the failed drive until you are ready to install the replacement.
Determine which drive to replace before making the replacement.
To identify a failed drive:
LEDs are solid amber or red or off
Event appears in the Events list
Receipt of an email from the array
Verify that the replacement drive matches the part shown on the RMA work
order.
Procedure
1. Gently pull the front bezel away from the array chassis.
The bezel includes power connection pins on both sides.
1 Bezel
2. Identify the failed drive.
A failed drive has a red drive fault LED. (Do not replace a drive with a dark drive fault LED.)
1 Drive fault
3. Release and remove the drive from the drive carrier.
a) To release the handle, press the release tab toward the carrier LEDs.
b) Pull the drive carrier handle to remove the drive from the chassis. Use firm, steady pressure.
2 Chassis
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Maintenance Procedures 77