2. If more I/O groups are congured, 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. 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
As Figure 136 on page 124 shows, you can combine 2145-24F , 2145-12F, and 2145-92F enclosures in a
SAS chain. 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:
• 2145-92F enclosures have a chain weight of 2.5
• 2145-24F and 2145-12F enclosures have a chain weight of 1.
Example
Table 17 on page 125
shows examples of different combinations of SAS weights.
Table 17. Examples of supported SAS chain combinations
2145-12F Enclosures 2145-24F Enclosures 2145-92F Enclosures Combined chain weight
0 0 4 10
2 0 3 9.5
2 3 2 10
0 7 1 9.5
1 1 1 4.5
(as shown in Figure 136
on page 124)
In addition, the orientation of the Input and Output SAS ports on the 2U and 5U SAS enclosures differs.
Figure 137 on page 126 shows the SAS ports on the 2145-92F , 2145-12F, and 2145-24F SAS
enclosures.
Chapter 4. Installing an optional 5U SAS expansion enclosure
125
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