Adding and Configuring Components

XBC-XBC Link Load Equation A simple calculation can be made to evaluate whether or not a particular
configuration will have bottlenecks.
The number of cells on one quad, Qx, that talk to another quad Qy1.
The total number of cells is Qt2.
The number of links between the two quads is L. (Always 1)3.
Link load is Qx*Qy/Qt/L. (Link load = 4*4/8/2 = 1).
Strive always for a link load of 1.0 or less.
4.
The lower the link load, the better off the system. If link loads begin to approach 2, bottlenecks may occur.
For a dual cabinet system, there are six equations covering each link:
Quad 0 talking to Quad 1 L1 = Q0*Q1/Qt/11.
Quad 0 talking to Quad 2 L2 = Q0*Q2/Qt/12.
Quad 0 talking to Quad 3 L3 = Q0*Q3/Qt/13.
Quad 1 talking to Quad 2 L4 = Q1*Q2/Qt/14.
Quad 1 talking to Quad 3 L5 = Q1*Q3/Qt/15.
Quad 2 talking to Quad 3 L6 = Q2*Q3/Qt/16.
Figure 2 shows a nine-cell partition on superdome 64 way spread across cabinets: Cab 0, slots 0-5, 7 and Cab 1, slots 12
and 14.
Figure 2 9 Cell Partition
I/O Chassis Allocation
For best high availability, I/O devices are connected to different I/O Bays to reduce single points of failure.
Rules dictate that the roots are selected first, then all other I/O are added.
I/O can connect anywhere, but tools will guide you to the best selection.
System Planner
The System Planner is a tool available under AIM. Click on File>Enable>SuperDome>Calculator and Planner.
Using the System Planner you can create a system with partitions ordered with the following information:
Number of cell boards, memory modules, and active CPUs
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Number of cell boards to reserve for future expansion●
Additional Configuration Resources
You can find other information on superdome configuration by searching for configuration on this EPSS.
Superdome Configuration
http://superdome-test.fc.hp.com/sd_web/content/00/0A/DU/idd/400.html (4 of 5) [03/01/2001 2:09:21 PM]