Link Rate Leds - IBM System Storage DS5020 Installation, User's, And Maintenance Manual

Before you begin, ensure that you wear an anti-static wrist strap.
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 111 ensuring that the DS5020 storage subsystem is
turned off before any attached storage expansion enclosures.
2. Locate the link rate indicator LEDs. Figure 83 shows the location of the link
rate indicator lights on the back of the storage subsystem.
Link
Rate
LEDs
Two on = 4 Gbps
One on = 2 Gbps
Figure 83. Link rate LEDs
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 DS5020 is always set to 4
Gbps. The DS5020 supports only 4 Gbps FC drives.
3. Is the data transfer rate set correctly?
Note: Make sure that the link rate for the DS5020 is always set to 4 Gbps.
v Yes - Go to step 8 on page 142.
v No - Go to step 5 on page 142 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 31.
4. Locate the link rate switch. Figure 83 shows the location of the link rate
indicator light on the front of the command module.
Chapter 5. Replacing components
141