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– Ethernet ports, including the technician port. The technician port is used for initial setup of the
system by directly attaching to a personal computer. It can also be used to complete service actions
for the system.
– USB ports.
– The nodes and the enclosures themselves. Access is required to the hardware for servicing and for
safely removing and replacing components by using two or more people.
Procedure
If more I/O groups are configured, repeat the cabling procedure for the other I/O groups. Each system
can have a maximum of four I/O groups, with two chains of expansion enclosures attached to each I/O
group. Two chains of expansion enclosures can be attached to each I/O group. On each SAS chain, the
systems can support up to a SAS chain weight of 10.
Combining 2U and 5U expansion enclosures
About this task
The limiting factor is the combined chain weight of the various components. The maximum SAS chain
weight that can be attached to a node SAS port is 10:
• 5U expansion enclosures have a chain weight of 2.5
• 2U expansion enclosures have a chain weight of 1.
Example
Table 11 on page 45 shows example of different combinations of SAS weights.
Table 11. Examples of supported SAS chain combinations
2U Enclosures (12
drives)
2
2
0
1
In addition, the orientation of the Input and Output SAS ports on the 2U and 5U SAS enclosures differs.
2U Enclosures (24
drives)
0
3
7
1
5U Enclosures (92
Combined chain weight
drives)
3
2
1
1
Chapter 2. Installing the system hardware 45
9.5
10
9.5
4.5
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