IBM System Storage DS3000, Programming Manual

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The controller in the DS4800 controller module can have up to four host channels with one port for each
channel; up to two drive channels with two ports per channel (for a total of four drive ports); and, up to
two Ethernet ports. In the DS4800 (models 82, 84, and 88) controller module, the controllers are stacked
one above the other. The top controller is A. The bottom controller is B.
For controller A, the host channel identifiers are a1, a2, a3, and a4 (you will need this reference for the
CLI commands and the script commands): the host bus adapter (HBA) host ports are labeled 1, 2, 3, and
4. For controller B, the host channel identifiers are b1, b2, b3, and b4: the host bus adapter (HBA) host
ports are labeled 1, 2, 3, and 4.
The HBA host ports are labeled as shown in the following figure:
Controller A has drive channels 1 and 2. Controller A drive port pairs labeled 4 and 3 and 2 and 1
connect to controller A drive channels 1, and 2, respectively. Similarly, controller B also has two drive
d
s4
7
_
h
o
st
_p
o
rts
A
B
1 2 3 4
1 3 4 2
Figure 4-7. DS4200 and DS4700 Host Ports
A
B
ds48_host_ports
4 3 2 1
1 2 3 4
Figure 4-8. DS4800 Host Ports
4-6
IBM System Storage DS3000, DS4000, and DS5000: Command Line Interface and Script Commands Programming Guide