SP Switch function (MAP 0620)

Step 0620-033

All ground straps connecting the frames make adequate contact at both ends.

1.Disconnect clock source data cable at S00-BH-J3, J5, J7, or J9, then reconnect to SP Switch. (This is done to eliminate clocking noise from cable.)

2.Find a processor node in the ªproblemº frame which is usable for service. This will be used as the ªtestº processor node.

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.

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

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

vIf yes, go to ªStep 0620-036º on page 1-34.

vIf the diagnostics did not fail with an indication of a clock problem:

a.If this the first time at this step, go to ªStep 0620-034º.

b.If this the second time through this step, go to ªStep 0620-043º on page 1-36 to verify fix.

Step 0620-034

The first time you went through ªStep 0620-033º, the diagnosticsdid not fail with an indication of a clock problem.

1.Disconnect the switch data cable corresponding to the selected clock at the SP Switch.

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.

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

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

vIf yes:

a.Problem is not in the SP Switch.

b.Replace the switch data cable corresponding to the selected clock, reconnecting it at both SP Switches.

c.Go to ªStep 0620-040º on page 1-35.

vIf no, go to ªStep 0620-035º.

Step 0620-035

The ªcss0º diagnosticsdid not fail with an indication of a clock problem. This indicates that the problem is related to the clock selection in this SP Switch.

1.Replace the clock card in this SP Switch.

v Make sure to connect all cables connected to the clock card.

2.Reinstall only the two switch data cables which are not selected and the switch data cable to the ªtestº processor node.

v Do not connect the remaining switch data cables at this time.

3.Reconnect cables S00-BH-P1 and S00-BH-P2 at the rear of the SP Switch.

4.Put the SP Switch's circuit breaker into the On (`1') position.

Chapter 1. Maintenance Analysis Procedures (MAPs) 1-33

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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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