Note: The Drive fault LEDs might flash intermittently while the E-DDMs spin
up.
vIf 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.
vIf 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 135
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 DS5020 is always set to 4 Gbps.
The DS5020 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 138. 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 DS5020 storage subsystem drive channel operates at a 4 Gbps Fibre Channel
interface speed. The DS5020 storage subsystem SATAE-DDM CRUs have an ATA
translator card that converts E-DDM 3 Gbps SATAdrive interface protocol a 4 Gbps
Fibre Channel interface protocol. Set the DS5020 enclosure speed to 4 Gbps when
these SATAE-DDM CRUs are installed and connected to storage expansion
enclosures running at 4 Gbps speed. The link rate setting speed must be set
accordingly. See “Verifyingthe link rate setting” for more information.
Do not mix 2 GB drives and 4 GB drives in the same storage subsystem. If drives
of mixed speeds reside in the storage subsystem, the data transfer rate changes
depending on the configuration. Table19 on page 137 shows the data transfer rates
for drives of different configurations.
136 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide