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10. Use the DS4000 Storage Manager software to configure the additional space
Verifying the Link Rate setting
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 expansion enclosure as
shown in Figure 47 on page 88. The Link Rate indicator LEDs are located on the
back of the storage expansion enclosure. The Link Rate switch enables you to
select the data transfer rate between the ESMs and the drives to either 2 Gbps or 4
Gbps. The Link Rate switch is only read when the storage expansion enclosure is
powered up.
Notes:
1. Do not mix storage expansion enclosures with different Link Rate speed settings
2. The EXP420 storage expansion enclosure drive channel operates at either 2 or
86
IBM System Storage DS4000 EXP420 Storage Expansion Enclosure: Installation, User's and Maintenance Guide
Note: If your storage subsystem has active hot spares, data might not start
copying to the new EV-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 EV-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 EV-DDMs spin
up.
v If the Drive activity LED is off, the EV-DDM CRU might not be installed
correctly. Remove the EV-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
EV-DDM might be faulty. See the DS4000 Storage Manager software for
problem determination.
8. Use the DS4000 Storage Manager software to monitor the status of the new
EV-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 EV-DDM. In that case, use the host
software to determine if the data reconstruction is finished.
9. When reconstruction is finished on the new EV-DDM, repeat step 5 on page
85 through step 8 for each additional EV-DDM that you want to install.
on the new EV-DDMs.
in the same drive loop.
4 Gbps fibre channel interface speed. The EXP420 SATA EV-DDM CRUs have
an ATA translator card that converts EV-DDM 3 Gbps SATA drive interface
protocol to either 2 Gbps or 4 Gbps fibre channel interface protocol. It is
recommended that the EXP420 enclosure speed is set to 4 Gbps when these
SATA EV-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 Table 22 on page 87 for more information. The enclosure
speed of the DS4200 Express Storage Subsystem that the EXP420s are
connected to must also be set to 4 Gbps.
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