IBM DS3950, Installation, User'S, And Maintenance Manual, Page: 168 / 252

If both link rate indicator LEDs are on, the data transfer rate is set for 4 Gbps.
If one link rate indicator light is on, the data transfer rate is set for 2 Gbps.
Important:
Make sure that the link rate for the DS3950 is always set to 4
Gbps. The DS3950 supports only 4 Gbps FC drives.
3. Is the data transfer rate set correctly?
Note: Make sure that the link rate for the DS3950 is always set to 4 Gbps.
v
Yes - Go to step 8 on page 141.
v No - Go to step 5 to change the setting.
Attention: When you handle static-sensitive devices, take precautions to
avoid damage from static electricity. For details about handling static-sensitive
devices, see “Handling static-sensitive devices” on page 29.
4. Locate the link rate switch. Figure 81 shows the location of the link rate
indicator light on the front of the command module.
5. Change the link rate switch setting by doing the following:
a.
Put on antistatic protection.
b. Use a small screwdriver or the tip of a ball point pen to slide the link rate
switch to the left or right to set the desired Fibre Channel operating speed.
Link
Rate
LEDs
Two on = 4 Gbps
One on = 2 Gbps
Figure 81. Link rate LEDs
Link Rate sw itch
(2 Gbps or 4 Gbps)
Figure 82. Link rate switch
140
IBM System Storage DS3950 Storage Subsystem: Installation, User’s, and Maintenance Guide