SP Switch function (MAP 0620)

5.Look for an SRN indicating a clock problem, such as ªExternal clockº being listed as one of the failing components.

6.Do the ªcss0º diagnostics fail with indication of a clock problem? v If yes:

a.Problem is the clock selection in this SP Switch.

b.Return to ªStep 0620-035º on page 1-33.

vIf no, go to ªStep 0620-039º.

Step 0620-039

The ªcss0º diagnosticsdid not fail. This indicates that the problem is not in this SP Switch.

1.Return all cables to their original positions.

2.Return to ªStep 0620-034º on page 1-33.

Step 0620-040

The clock settings on the problem switch appear to be okay and the problem switch is mounted in a frame that also contains processor nodes. The ground straps appeared to be okay so you set up a test processor node and went through the ªcss0º advanced diagnostics. The diagnostics passed on the first run through so you disconnected the switch data cable and ran the diagnostics a second time. On the second run, the diagnostics failed. This indicated that the problem was not in the SP Switch.

1.Make certain that you replaced the switch data cable corresponding to the selected clock at both SP Switches.

2.Run advanced diagnostics on ªcss0º on the ªtestº processor node and its associated switch port. v Do not perform cable wrap test.

vRefer to ″Running diagnostics in a processor node″ in RS/6000 SP: System Service Guide.

3.Look for an SRN indicating a clock problem, such as ªExternal clockº being listed as one of the failing components.

4.Do the ªcss0º diagnostics fail with indication of a clock problem?

vIf yes, go to ªStep 0620-041º.

± Replace the ªmaster-clockº SP Switch.

vIf no:

a.Interframe clock problem resolved.

b.Go to ªStep 0620-043º on page 1-36 to verify fix.

Step 0620-041

You have determined that there is a problem in the SP Switch and that you need to replace the switch assembly.

1.Put the SP Switch's circuit breaker into the Off (`0') position.

2.Disconnect all switch data cables (also clock cables and data cable interposers, if present) from the bulkhead of the switch assembly.

3.Replace the switch inner chassis.

4.Replace the switch planar.

5.Reinstall all cables inside the switch assembly.

6.Reinstall the top cover.

7.Reinstall the switch assembly.

8.Go to ªStep 0620-042º.

Step 0620-042

You have replaced switch components and need to complete a final check before verifying the fix.

1.Be careful to reconnect all cables according to the appropriate wiring chart or labels, and put wrap plugs on any unused data ports (S00-BH-J3 through S00-BH-J34).

Chapter 1. Maintenance Analysis Procedures (MAPs) 1-35

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IBM RS/6000 SP manual Step
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RS/6000 SP specifications

The IBM RS/6000 SP (Scalable Power) is a high-performance computing system that was developed in the early 1990s and has since become a significant player in the realm of supercomputing and enterprise solutions. Designed primarily for scientific, engineering, and complex data analysis tasks, the RS/6000 SP provides powerful processing capabilities, enhanced scalability, and features to support demanding applications.

One of the key characteristics of the RS/6000 SP is its modular architecture, which allows for the addition of multiple nodes. Each node is based on IBM's Power architecture, leveraging the RISC (Reduced Instruction Set Computing) design to achieve high throughput and efficiency. The system can support configurations ranging from a few nodes to hundreds, enabling organizations to scale their computational power as needed based on workload requirements.

The RS/6000 SP employs advanced interconnect technologies, most notably the SP Switch, which ensures high-speed communication between nodes. This interconnect allows for seamless data transfer, ensuring that the system can handle large datasets and complex computations without bottlenecks. The SP's ability to deliver concurrent processing capabilities makes it ideal for parallel computing tasks, including simulations, modeling, and large-scale computations.

In terms of software, the RS/6000 SP was equipped with AIX, IBM's version of the UNIX operating system, which provides a stable and secure environment for enterprise applications. Furthermore, the system supports a vast array of programming languages and tools, including Fortran, C, and C++, along with libraries and frameworks designed for high-performance computing. This compatibility allows developers to optimize their applications to fully utilize the underlying hardware.

Another notable feature of the RS/6000 SP is its extensive support for various workloads, including database management, multi-user applications, and graphical processing. The system was equipped with high-performance graphics capabilities, making it suitable for tasks that require intensive visualization, such as computer-aided design (CAD) and scientific visualization.

Overall, the IBM RS/6000 SP has solidified its role in the high-performance computing landscape, combining advanced technologies, robust scalability, and flexibility to meet the unique demands of research and enterprise environments. Its legacy continues to influence modern computing architectures, embodying IBM’s commitment to innovation and performance in the pursuit of complex problem-solving capabilities.
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