SP Switch function (MAP 0620)

5.Set the switch clock selections on the ªproblemº switches (refer to ªSelecting appropriate switch clocksº on page 3-6).

6.Run advanced diagnostics on ªcss0º on the ªtestº processor node and its associated switch port.

vDo not perform cable wrap test.

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

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

Note: Do not exit from diagnostics at this time, as it may be used in the following steps.

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

vIf yes, the clock problem is resolved. Go to ªStep 0620-043º on page 1-36 to verify fix.

vIf no, go to ªStep 0620-041º on page 1-35 to replace the problem switch assembly.

Step 0620-036

The ªcss0º diagnostics failed at ªStep 0620-033º on page 1-33 and indicated a clock problem.

1.Record current clock setting for the switch (internal/external).

2.From the control workstation, select the internal clock for this switch assembly.

3.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.

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

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

vIf yes, go to ªStep 0620-037º.

vIf no, go to ªStep 0620-037º.

Step 0620-037

You have run the ªcss0º diagnostics.

1.At the SP Switch, check the data cable interposer (if present) and the switch data cable corresponding to the original external clock selection for any obvious problem such as a loose cable connection or swapped cables.

2.Determine which connection is the other end of the switch data cable checked in the step above. v Refer to Appendix A in RS/6000 SP: Installation and Relocation.

3.Check the switch data cable at the other SP Switch for any obvious problem such as a loose cable connection or swapped cables.

4.Do the switch data cables and any data cable interposers appear to be okay? v If yes, go to ªStep 0620-038º.

v If no:

a.Fix the obvious cable connection problem.

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

Step 0620-038

The switch data cables and the data cable interposers appear to be okay.

1.Swap the data cable with another one at S00-BH-J3, S00-BH-J4, or S00-BH-J5.

2.To provide a good clock, swap the switch data cable at the switch assembly with another one.

3.Reset the clock setting to that recorded in ªStep 0620-036º.

4.Run advanced diagnostics on ªcss0º on the ªtestº processor node and its associated switch port.

vDo not perform cable wrap test.

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

1-34RS/6000 SP: SP Switch Service Guide

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IBM RS/6000 SP manual Do not perform cable wrap test
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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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