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Setting data transfer rates on host-side mini hubs
To set the Link Rate Interface switch on the host-side mini hubs, complete the
following steps.
Note: Host-side mini hub ports must be connected to devices that have the same
data transfer rate.
1. Verify the data transfer rate of the devices on the loop or the fibre channel
switch port.
2. Set the data transfer rate on the host bus adapter based on the data transfer
rate of the devices on the loop or the fibre channel switch port.
3. Set the Link Rate Interface switch to match the data transfer rate of the host
bus adapter.
Setting data transfer rates on drive-side mini hubs
On the drive-side mini hubs, set the Link Rate Interface switch to 2 Gbps or 1 Gbps
based on the data transfer rate of the storage expansion enclosures.
Note: All storage expansion enclosures on the loop and drive-side mini-hub ports
must be connected to devices that have the same data transfer rate.
To set the data transfer rate on drive-side mini hubs, perform the following steps:
1. Verify the data transfer rate of the storage expansion enclosure on the loop.
2. Set the link rate interface switch to match the data rate of the storage expansion
enclosure.
Note:
The data transfer rate of all drives mini hubs must be set to operate at either
1 Gbps or 2 Gbps. If you have one set of drive loops using EXP500 storage
expansion enclosures (data transfer speed of 1 Gbps) and the other set of
drive loops using EXP700 storage expansion enclosures (data transfer
speed of 2 Gbps), the speed of all drive mini hubs must be set to 1 Gbps.
Not doing so will result in drive channel mini hub data rate mismatch errors.
Figure 86. Mini hub Link Rate Interface switch and Speed LED
114 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide