IBM Midrange System DS4000 Series Hardware Manual page 76

Figure 3-31 shows that the host ports are connected to eight sets of FC host bus adapters
(HBAs). You can replace one or all of these sets of FC HBAs with FC switches as required. In
our example, HBA 1 of the host AIX is connected to port 1 in the host card 1 in RAID
controller A. HBA 2 is connected to the same port and card number in controller B.
HBA2
HBA1
Host AIX
Figure 3-31 Directly connected hosts to the DS5000 storage subsystem
In practice, there is no difference about which ports in which order (in one controller) will be
connected to hosts or switches. However, we recommend connecting hosts or switches in the
following order:
Models 5100 and 5300 with eight host ports (single Host Interface Card per controller):
1. Controller A, host card 1, port 1 <-> controller B, host card 1, port 1
2. Controller A, host card 1, port 3<-> controller B, host card 1, port 3
3. Controller A, host card 1, port 2<-> controller B, host card 1, port 2
4. Controller A, host card 1, port 4<-> controller B, host card 1, port 4
Models 5100 and 5300 with 16 host ports (two Host Interface Cards per controller):
1. Controller A, host card 1, port 1 <-> controller B, host card 1, port 1
2. Controller A, host card 2, port 1 <-> controller B, host card 2, port 1
3. Controller A, host card 1, port 3<-> controller B, host card 1, port 3
4. Controller A, host card 2, port 3<-> controller B, host card 2, port 3
5. Controller A, host card 1, port 2<-> controller B, host card 1, port 2
6. Controller A, host card 2, port 2<-> controller B, host card 2, port 2
7. Controller A, host card 1, port 4<-> controller B, host card 1, port 4
8. Controller A, host card 2, port 4<-> controller B, host card 2, port 4
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IBM Midrange System Storage Hardware Guide