IBM Midrange System DS4000 Series Hardware Manual page 94

Controller A
Figure 3-52 DS5020 rear view: 8 FC Port model
Another configuration of the DS5020 has additional four 8 Gbps FC host ports (Figure 3-52)
or additional four 1 Gbps iSCSI host ports instead (Figure 3-53).
Controller A
Optional FC
HIC installed
Figure 3-53 DS5020 rear view: 4 FC and 4 iSCSI port model
The DS5020 rear view shows four hot swappable parts:
The two controllers with the Backup Battery Unit (BBU)
The two Power Supply and Fan Units
The two controllers hold host and drive interfaces as well as the batteries. The left controller is
controller A and the right controller is controller B. Note that controller A is upside-down
relative to controller B. The same configuration applies to the power supply and fan unit. It is
important to keep this information in mind when connecting the back-end ports to hosts and
drive-side expansion enclosures. Refer to 3.5.7, "DS5020 storage subsystem drive-side
connections" on page 85 for more details.
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IBM Midrange System Storage Hardware Guide
Serial Ethernet Dual-ported
port ports drive channel
Enclosure ID
Optional FC
HIC installed
Serial Ethernet Dual-ported
port ports drive channel
Power-fan Fibre Channel
Enclosure ID
canister host channels
Fibre Channel
Enclosure ID
host channels
Fibre Channel Dual-ported
host channels drive channel
iSCSI
host Fibre Channel
Enclosure ID
channels host channels
iSCSI
host Controller Dual-ported
channels canister drive channel
Controller B
Ethernet Serial
ports port
Controller B
Ethernet Serial
ports port