Switch Function (MAP 0620)

vIf no, go to ªStep 0620-019º.

Step 0620-019

Some but not all switch data cables appear to be having problems.

1.Depending on whether the problem is a wrapped port or a switch-to-switchconnection, perform one of the following steps:

vWrapped port (wrap plug installed): Remove the existing wrap plug. Install a different wrap plug on the interposers indicated.

vSwitch-to-switchconnection: Disconnect the switch data cable from both ports indicated. Install wrap plugs on the interposers indicated.

Note: When unplugging the two ends of the suspect cable, check /var/adm/SPlogs/css0/p0/out.top to verify only two (2) ports were lost. If four (4) ports were lost, then two cables were swapped across that switch to switch connection. Connect the cables correctly and check /var/adm/SPlogs/css0/p0/out.top for any other errors.

2.Make sure processor nodes that were put in ªServiceº mode are returned to ªNormalº mode. Make sure all processor nodes are IPLed completely.

3.Have customer verify that the switch code is running on all processor nodes.

4.From the control workstation, type Estart followed by ENTER.

5.Check /var/adm/SPlogs/css0/p0/out.top file for problems regarding the interposers indicated.

6.Does out.top file show a problem on any interposers indicated?

vIf yes:

a.Problem is in the switch assembly which is still reporting a problem.

b.Go to ªStep 0620-020ºto service or replace the switch assembly.

vIf no:

a.If this is a switch-to-switchconnection, remove both wrap plugs from the switch assemblies.

b.Replace the frame-to-frame switch data cable that was disconnected before.

c.Go to ªStep 0620-021ºto verify fix.

Step 0620-020

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

Note: Before taking this action, contact the next level of support. They will be able to advise you about system availability options that may allow the customer to continue operating.

1.Replace the switch planar.

v Refer to ªRemoving the switch planarº on page 4-7 and ªReplacing the switch planarº on page 4-8

2.Go to ªStep 0620-021º.

Step 0620-021

You have replaced switch components and need to verify that the problem has been fixed.

1.Make sure any processor nodes that were put in SERVICE mode are returned to NORMAL mode. Make sure all processor nodes are IPLed completely in NORMAL mode.

2.If any processor nodes lost connection to the switch due to unplugging node data cable, you will need to include them in the following command. From the control workstation, enter:

dsh -w nodelist /usr/lpp/ssp/css/rc.switch

where nodelist is a list of node names separated by commas.

Note: When working with a two-plane SP Switch2 system, add the adapter name to the command, as follows: dsh -wnodelist /usr/lpp/ssp/css/rc.switch -a<adapter_name>

OR, if all processor nodes have lost switch connection, enter:

Chapter 1. Maintenance Analysis Procedures (MAPs) 1-27

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IBM RS/6000 SP manual Dsh -w nodelist /usr/lpp/ssp/css/rc.switch
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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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