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 132 on page 138 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:
v 2145-92F enclosures have a chain weight of 2.5
v 2145-24F and 2145-12F enclosures have a chain weight of 1.
Example
Table 16 shows examples of different combinations of SAS weights.
Table 16. 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 132 on page
138)
In addition, the orientation of the Input and Output SAS ports on the 2U and 5U
SAS enclosures differs. Figure 133 on page 140 shows the SAS ports on the
2145-92F, 2145-12F, and 2145-24F SAS enclosures
Chapter 4. Installing an optional 5U SAS expansion enclosure 139
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