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58 Chapter 4
Configuring and Using the 9900 Subsystem
The 9960 subsystem can be configured with up to 32 connectable physical paths to provide
up to 32 concurrent host data transfers. The 9910 subsystem can be configured with up to 24
connectable physical paths to provide up to 24 concurrent host data transfers. Since only 16
channel interface IDs are available (due to 16 physical channel interfaces for IBM
®
systems),
the 9900 uses one channel interface ID for each pair of physical paths. For example, link
control processors (LCPs) 1A and 1B correspond to channel interface ID 08 (00), and LCPs 1C
and 1D correspond to channel interface ID 09 (01). Table 4.2 illustrates the correspondence
between physical paths and channel interface IDs on Cluster 1, and Table 4.3 illustrates the
same for Cluster 2.
Table 4.2 Correspondence between Physical Paths and Channel Interface IDs (Cluster 1)
Channel Interface ID
(used in commands)
08
(00)
09
(01)
0A
(02)
0B
(03)
0C
(04)
0D
(05)
0E
(06)
0F
(07)
LCP ID 1A & 1B 1C & 1D 1E & 1F 1G & 1H 1J & 1K 1L & 1M 1N & 1P 1Q & 1R
Table 4.3 Correspondence between Physical Paths and Channel Interface IDs (Cluster 2)
Channel Interface ID
(used in commands)
18
(10)
19
(11)
1A
(12)
1B
(13)
1C
(14)
1D
(15)
1E
(16)
1F
(17)
LCP ID 2A & 2B 2C & 2D 2E & 2F 2G & 2H 2J & 2K 2L & 2M 2N & 2P 2Q & 2R