IBM DS3500 Installation, User's, And Maintenance Manual page 149

DANGER
Electrical voltage and current from power cables are hazardous. To avoid
a shock hazard, always place electrical equipment on dry, static-free level
surfaces. Never turn on any electrical equipment when there is evidence
of fire, water, or structural damage.
4. Unpack the new drives. Set the drives on a dry, static-free level surface, away
from magnetic fields. Save the packing material and documentation in case
you have to return the drives.
5. Use the Storage Manager software to ensure that the subsystem that was
defined using these drives is in Optimal (not Degraded) state before you
manually fail the first drive that you want to replace. If the subsystem is in a
Degraded state, use the recovery procedures to bring the subsystem into the
optimal state.
Ensure that:
v You fail only one drive
v The software status display shows a Failed status for the applicable drive
v The amber drive fault LED (on the front bezel below the drive) is lit
Attention: Removing the wrong drive can cause data loss. Ensure that you
remove only the failed drive. A lit drive fault LED indicates the failed drive.
If you remove an active drive accidentally, wait at least 70 seconds and then
reinstall it. Because you have failed two drives in a RAID subsystem, the
subsystem might be marked as failed by the controller. This subsystem will
not be available to the host for I/O. See the Storage Manager software for
further recovery instructions. Do not attempt to replace any drives until the
subsystem is brought back to Optimal state.
6. Use the procedures in "Replacing a hot-swap drive" on page 126 to remove
the failed drive. Use the procedures in "Installing a hard disk drive" on page
124 to install the new drives in the storage subsystem.
The new drive automatically reconstructs the data after you install it in the
drive bay.
During data reconstruction, the amber drive fault LED might be lit for a few
minutes and then turn off when the green drive activity LED begins flashing.
A flashing drive activity LED indicates that data reconstruction is in progress.
Note: If the storage subsystem has active hot spares, data might not start
copying to the new drive until the data is reconstructed on the hot spare. This
increases the time that is required to complete the procedure.
7. Check the green drive activity LED and the amber drive fault LED on each of
the new drives.
Ensure that the drive activity LEDs are lit and the drive fault LEDs are off.
Note: The drive fault LEDs might flash intermittently while the drives spin
up.
v If the drive activity LED is off, the drive might not be installed correctly.
Remove the drive, wait 70 seconds, and then reinstall it.
v If the drive fault LED stays lit or the drive activity LED stays off, the new
drive might be faulty or might be an uncertified drive. Use the Storage
Chapter 5. Replacing components
131