IBM DS5100 User Manual

Figure 45 shows an example of improperly wired trunking. This example shows a
violation of trunking cabling rule 3, that port 2B of EXP5060 ESM A can only be
connected to an odd-numbered drive channel port in DS5100/DS5300 controller A
(port 7, 5, 3, 1). This controller drive port must be part of the same drive channel of
controller A as the ESM port is connected to in rule 1. As shown in Figure 45, port
2B of ESM A is incorrectly connected to port 5 of drive channel 2 instead port 7 of
drive channel 1.
Cascading the EXP5060 behind a drive channel is also supported using the
trunking cabling scheme. Figure 46 on page 72 shows an example of cascading
EXP5060s in the trunking cabling scheme.
Ch5 Ch6 Ch7 Ch8
Ch1 Ch2 Ch3 Ch4
P8 P7 P6P5 P4 P3 P2P1
P8P7P6P5P4P3P2P1
1A 1B
1A 1B
2A 2B
2A 2B
ESM A
ESM B
1A 1B
1A 1B
2A 2B
2A 2B
ESM A
ESM B
Figure 44. EXP5060 in trunking cabling scheme
Ch5 Ch6 Ch7 Ch8
Ch1 Ch2 Ch3 Ch4
P8 P7 P6 P5 P4 P3 P2 P1
P8P7P6P5P4P3P2P1
1A 1B
1A 1B
2A 2B
2A 2B
ESM A
ESM B
Figure 45. An example of trunking cabling that is improperly wired
Chapter 3. Cabling the storage subsystem 71

IBM DS5100 Specifications

General

Brand	IBM
Model	DS5100
Category	Storage
Language	English