Ds5020 Storage Subsystem Rear View - IBM Midrange System DS4000 Series Hardware Manual

Several LED indicators and the FC Link speed selector are also visible from the front of the
storage unit. Refer to "Front panel LEDs and FC link speed selector" on page 79 for details
about the LEDs.
Attention: Never hot-swap an E-DDM CRU when its associated green activity LED is
flashing. Hot-swap a drive CRU only when its associated amber fault LED light is not
flashing or when the drive is inactive and its associated green activity LED light is not
flashing. Wait 70 seconds before inserting the drive back into the bay.

3.5.4 DS5020 storage subsystem rear view

The rear of the DS5020 appears in different versions depending on what host port
configuration has been ordered for the system (Figure 3-51, Figure 3-52 on page 76, and
Figure 3-53 on page 76).
Controller A
No optional HIC installed
Figure 3-51 DS5020 rear view: Base model
They vary only in host port configurations. The base model does not have the optional Host
Interface Cards (HIC). It comes with four 8 Gbps Fibre Channel host ports.
Serial Ethernet Dual-ported
port ports drive channel
Enclosure ID
Chapter 3. IBM System Storage DS4000 and DS5000 hardware
Fibre Channel
Enclosure ID
host channels
Fibre Channel Dual-ported
host channels drive channel
Controller B
Ethernet Serial
ports port
75