IBM System Storage DCS3700 Installation, User's, And Maintenance Manual page 130

Set the DDMs on a dry, level surface away from magnetic fields. Save the packing material and
documentation in case you need to return them.
5. Use the DS Storage Manager software to ensure that the array that was defined using these DDMs is
in optimal (not degraded) state before manually failing the first DDM you want to replace. If the
array is in degraded state, use the recovery procedures to bring the array into the optimal state.
Make sure of the following:
v You fail only one DDM.
v The software status display shows a failed status for the appropriate DDM.
v The amber Drive fault LED (on the front bezel below the DDM) is on.
Attention: Removing the wrong DDM can cause data loss. Make sure that you remove only the
failed DDM FRU. The Drive fault LED below the failed DDM FRU should be on.
If you remove an active DDM accidentally, wait at least 30 seconds and then reinstall it. Because you
failed two 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 DDMs until the array is brought back to optimal state.
6. Use the procedures in "Replacing hot-swap hard disk drives" on page 103 to remove the failed
drive. Use the procedures in "Installing hot-swap hard disk drives" on page 101 to install the new
DDMs into the DCS3700.
The new 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 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 DDM FRUs.
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 DDMs spin up.
v If the Drive activity LED is off, the DDM FRU might not be installed correctly. Remove the DDM
FRU, wait 30 seconds, and then reinstall it.
v If the Drive fault LED stays on or the Drive activity LED stays off, the new DDM might be faulty.
See the DS Storage Manager software for problem determination.
8. Use the DS Storage Manager software to monitor the status of the new 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 DDM. In that case, use the host software to determine if the data
reconstruction is finished.
9. When reconstruction is finished on the new DDM, repeat step 5 through step 8 for each additional
DDM that you want to install.
10. Use the DS Storage Manager software to configure the additional space on the new DDMs.
108
IBM System Storage DCS3700: Installation, User, and Maintenance Guide