IBM System Storage DS5020 Installation, User's, And Maintenance Manual page 169

v You fail only one E-DDM.
v The software status display shows a failed status for the applicable E-DDM.
v The amber Drive fault LED (on the front bezel below the E-DDM) is on.
Attention: Removing the wrong E-DDM can cause data loss. Make sure that
you remove only the failed E-DDM CRU. To identify the failed E-DDM CRU,
look for the lit Drive fault LED.
If you remove an active E-DDM accidentally, wait at least 30 seconds and then
reinstall it. Because you failed two E-DDMs in a RAID array, the array might be
marked failed by the controller. This array will not be available to the host for
I/O. See the DS Storage Manager software for further recovery instructions. Do
not attempt to replace any E-DDMs until the array is brought back to optimal
state.
6. Use the procedures in "Replacing hot-swap E-DDMs" on page 133 to remove
the failed E-DDM. Use the procedures in "Installing hot-swap E-DDMs" on
page 132 to install the new E-DDMs into the storage subsystem.
The new E-DDM automatically reconstructs the data after you install it in the
drive slot.
During data reconstruction, the amber Drive fault LED might come on for a few
minutes, 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 your storage subsystem has active hot spares, data might not start
copying to the new E-DDM 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 above the
new E-DDM CRUs.
Make sure that the Drive activity LEDs are on and the Drive fault LEDs are off.
Note: The Drive fault LEDs might flash intermittently while the E-DDMs spin
up.
v If the Drive activity LED is off, the E-DDM CRU might not be installed
correctly. Remove the E-DDM CRU, wait 30 seconds, and then reinstall it.
v If the Drive fault LED stays on or the Drive activity LED stays off, the new
E-DDM might be faulty or might be an uncertified drive. See the DS Storage
Manager software for problem determination. In the case of an uncertified
drive, verify that the drive options or drive FRU part number is correct for
your storage subsystem.
8. Use the DS Storage Manager software to monitor the status of the new
E-DDM and the progress of the data reconstruction. Wait for data
reconstruction to finish (the Drive activity LED stops flashing).
Note: The Drive activity LED will continue to flash after reconstruction is
finished if there is I/O activity to that E-DDM. In that case, use the host
software to determine if the data reconstruction is finished.
9. When reconstruction is finished on the new E-DDM, repeat step 5 on page 138
through step 8 for each additional E-DDM that you want to install.
10. Use the DS Storage Manager software to configure the additional space on the
new E-DDMs.
Chapter 5. Replacing components
139