SP Switch function (MAP 0620)

vIf yes, go to ªStep 0620-027º.

vIf no:

a.The problem switch is providing the master clock for the system.

b.Have customer use the Eclock command to select a different master clock for the system.

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

Step 0620-027

The clock selection is set to one of the External clocks.

1.Select a different external clock for this SP Switch.

2.From the control workstation of the primary node reinitialize the switch by entering:

Estart

3.Check /var/adm/SPlogs/css/out.top file to see if problems are still reported on all data cables connected to this SP Switch.

4.Have some of the problems reported on data cables connected to this switch assembly been resolved? v If yes, go to ªStep 0620-029º.

vIf no, go to ªStep 0620-028º.

Step 0620-028

None of the problems reported on data cables connected to this SP Switch been resolved by selecting a different external clock. This indicates a probable problem with switch clock card or switch planar in this SP Switch.

1.Replace the clock card in this SP Switch.

2.Make sure to reconnect all cables connected to the clock card.

3.Reconnect cables S00-BH-J1, S00-BH-J2, S00-BH-J3, S00-BH-J5, and S00-BH-J7 at tailgate of this SP Switch.

4.Set the switch clock selection on this SP Switch to the original (correct) setting.

5.From the control workstation of the primary node reinitialize the switch by entering:

Estart

6.Check /var/adm/SPlogs/css/out.top file to see if problems are still reported on all data cables connected to this SP Switch.

7.Are there still problems reported on all data cables connected to this SP Switch? v If yes:

a.You have a problem with switch planar.

b.Go to ªStep 0620-041º on page 1-35 to replace switch assembly.

vIf no:

a.Clock problem resolved for this SP Switch.

b.Go to ªStep 0620-042º on page 1-35.

Step 0620-029

Some of the problems reported on data cables connected to this SP Switch been resolved by selecting a different external clock. This indicates a probable problem with the original external clock source.

1.Based on the original external clock selection, locate the frame which was sourcing the switch clock.

2.Locate a ªtestº processor node in this frame which can be used for service.

3.Disconnect the switch data cable for this processor node at the tailgate of the SP Switch.

4.Using the switch cabling list, locate the switch data cable at the frame containing the processor node. One of the following cables sources the clock to the failing SP Switch:

v S00-BH-J3

vS00-BH-J5

vS00-BH-J7

Chapter 1. Maintenance Analysis Procedures (MAPs) 1-31

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IBM RS/6000 SP manual Estart

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.