IBM 990 - Manual (Page 92)

80 IBM
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zSeries 990 Technical Guide
STI links balancing across books and MBAs
Figure 3-4 shows a 2084-B16 server’s initial configuration example with two fully populated
I/O cages (seven I/O domains on each one).
Figure 3-4 2084-B16 initial configuration example
The 2084-B16 server has two books in the CEC cage. The STI links are distributed across
books, MBAs, and I/O cages, as a result of the initial server configuration balancing.
Nearly the same number of STIs of each book’s MBA are used and spread across the two I/O
cages, resulting in the best STI link distribution for both performance and availability.
Figure 3-5 on page 81 shows an upgrade from this 2064-B16 server to a model D32,
maintaining the same I/O cages and I/O cards.
2084-B16 CEC Cage
I/O Cage 1 I/O Cage 2
Book 0 Book 1
STIs
I/O Domains
STI Links
I/O Cards
MBA
0
MBA
1
MBA
2
MBA
0
MBA
1
MBA
2