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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 subsystem as shown in
Figure 76 on page 122. The Link Rate indicator LEDs are located on the back of
the storage subsystem. The Link Rate switch enables you to select the data
transfer rate between the controllers and the drives to either 2 Gbps or 4 Gbps. 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
The DS4200 Express Storage Subsystem drive channel operates at either 2 or 4
Gbps fibre channel interface speed. The DS4200 Express Storage Subsystem
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 DS4200 Express enclosure speed is set at 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 "Verifying the 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. Table 32 on page 121 shows the data transfer rates
for drives of different configurations.
CAUTION:
Do not change the Link Rate setting while the storage subsystem is running.
Changing the Link Rate setting while the storage subsystem is running could
cause drives to fail. You must power down the storage subsystem and
storage expansion enclosures before changing the Link Rate setting.
120
IBM System Storage DS4200 Express Storage Subsystem: Installation, User's and Maintenance Guide
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
119 through step 8 on page 119 for each additional EV-DDM that you want to
install.
on the new EV-DDMs.
same drive loop.
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