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Attention: All devices on the loop must have the same data transfer rate, which
means that you must set the link rate on the storage expansion enclosure to the
same rate as the storage subsystem to which it is connected. Information about
supported DS4000 storage subsystems can be obtained from the certified
Compatibility Matrix, which can be found at the following Internet location:
www-1.ibm.com/servers/storage/disk/ds4000/interop-matrix.html
Table 50. Data transfer rates for drive modules
Link Rate
Switch
Setting
Storage Subsystem
with 2 GB Drives
Storage Subsystem with
4 GB Drives
Storage Subsystem with
Mixed Drives
2 Gbps Drives function in 2
Gbps mode.
Drives work in 2 Gbps
mode.
All drives work in 2 Gbps
mode.
4 Gbps Drives do not come
online.
Drives work in 4 Gbps
mode.
2 GB drives do not come
online.
4 GB drives work in 4 Gbps
mode.
Use the following procedure to check the current setting of the data transfer rate
and change it, if necessary:
1. Complete the power-off sequence described in “Turning off the storage
subsystem” on page 134 ensuring that the DS4000 storage subsystem is
turned off before any attached storage expansion enclosures.
2. Locate the Link Rate indicator LEDs. Figure 112 on page 163 shows the
location of the Link Rate indicator lights on the back of the storage subsystem.
162 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide