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Cluster Planning 15
2.2.2.2 Special Considerations
As for TCP/IP networks, there are a number of restrictions on non-TCP/IP
networks. These are explained for the three different types in more detail
below.
Serial (RS232)
A serial (RS232) network needs at least one available serial port per cluster
node. In case of a cluster consisting of more than two nodes, a ring of nodes
is established through serial connections, which requires two serial ports per
node. Table 3 shows a list of possible cluster nodes and the number of native
serial ports for each:
Table 5. Number of Available Serial Ports in Each Model
.
1
serial port can be multiplexed through a dual-port cable, thus offering two
ports
RS/6000 Model Number of Serial Ports Available
7006 1
1
7009 C10, C20 1
1
7012 Mod. 3XX and GXX 2
7013 Mod. 5XX 2
7013 Mod. JXX 3
7015 Mod. R10, R20, R21 3
7015 Mod. R30, R40, R50 3
7013,7015,7017 Mod. S7X 0
2
7024 EXX 1
1
7025 F50 2
7026 Mod. H50 3
7043Mod. 2
9076 thin node 2
3
9076 wide node 2
3
9076 high node 3
3
9076 thin node (silver) 2
3
9076 wide node (silver) 2
3