IBM DS3950, Installation, User'S, And Maintenance Manual, Page: 166 / 252

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 137
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.
Verifying the link rate setting
Important: Make sure that the link rate for the DS3950 is always set to 4 Gbps.
The DS3950 supports only 4 Gbps FC drives.
If a link rate problem is indicated, use the following procedure to verify the link
rate setting.
A link rate switch is located on the front of the storage subsystem as shown in
Figure 82 on page 140. The link rate indicator LEDs are located on the back of the
storage subsystem. The link rate switch is only read when the storage subsystem is
powered up.
Note:
Do not mix storage subsystems with different link rate speed settings in the
same drive loop.
The DS3950 storage subsystem drive channel operates at a 4 Gbps Fibre Channel
interface speed. The DS3950 storage subsystem SATA E-DDM CRUs have an ATA
translator card that converts E-DDM 3 Gbps SATA drive interface protocol a 4
Gbps Fibre Channel interface protocol. The DS3950 FC-SAS CRUs have a FC-SAS
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IBM System Storage DS3950 Storage Subsystem: Installation, User’s, and Maintenance Guide