Compaq 108164-003 - ProLiant - 800 Technical Manual page 8

I/O Performance Tuning of Compaq Servers
3. Avoid putting two network controllers together in the same bus unless both busses
4. When adding redundant NIC pairs, place both NICs on the same bus. If the server
Figure 3. Peer PCI Architecture
These guidelines should not be followed if one device consistently operates at a higher load. If,
for example, one particular NIC operates at or near its upper limit while 3 other NICs in the same
server remain relatively idle, you should not split the number of NICs evenly. In this case, you
should attempt to balance the loads by placing the heavily loaded card in one bus and the less
active NICs in another bus. Balancing the total load on the PCI bus, from all devices, is the key to
maximizing PCI throughput.
Table 1. PCI Bus Architectures of ProLiant servers
PCI Slot Bridged PCI Bus
Number Systems
ProLiant 2500
1 Secondary
2 Secondary
3 Secondary
4 Primary
5 Primary
6 Primary
7
8
9
10
11
ECG044.0399
already have a network controller installed. Note thatSince fewer devices can lower
contention, it is generally better to have a system with one dual-port NIC in each
bus than to have two single-port NICs in each bus.
was to failover to the backup device the load would remain balanced.
Microprocessor
ProLiant 1200 ProLiant 1600
Secondary Secondary
Secondary Secondary
Secondary Secondary
Primary Primary
Primary Primary
Primary Primary
133MB/s
Motherboard
266MB/s
Chipset
System
Memory
133MB/s
Peered PCI Bus Systems
ProLiant 5000
ProLiant 3000/
ProLiant 5500
Primary
Primary Secondary
Primary Secondary
Primary Secondary
Secondary Primary
Secondary Primary
Secondary Primary
Secondary Primary
PCI Slot
PCI Slot
PCI Slot
PCI Slot
PCI Slot
PCI Slot
PCI Slot
PCI Slot
ProLiant 6500
ProLiant 6000/
ProLiant 7000
Primary
Primary
Primary Secondary
Primary Secondary
Primary Secondary
Primary Secondary
Secondary Secondary
Secondary Secondary
Secondary
Secondary
Secondary
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