Using Perspectives to fence and unfence nodes attached to the switch

Fencing nodes

1.Bring up Hardware Perspectives for the system

2.Select the node to be fenced by either: v Double clicking the node

vOpening the node's notebook

3.Select either:

vFence

vFence with autojoin

Note: Selecting the autojoin option will automatically place the node back into the operations of the partition on successful power on of the Node. It is suggested that ªAutojoinºnot be selected at any time when performing a service action.

4. Click ″Apply″

Unfencing nodes

1.Bring up Hardware Perspectives for the system

2.Select the node to be unfenced by either: v Double clicking the node

vOpening the node's notebook

3.Select ªUnfenceº

4.Click ªApplyº

Efence of primary and primary backup nodes

System design does not allow Efence of primary and backup nodes by default. However, with the -f option, the primary and primary backup node may be fenced. In this case, a new oncoming primary node or oncoming primary backup node will be selected for you and an Estart will be issued. You will need to use the Eprimary command after the Efence command has completed to see what the new primary and primary backup nodes are.

Service position procedures

Note: When placing a switch into the service position, ensure that the customer has removed the switch from the active configuration.

Placing an SP Switch2 into service position

Note: Make certain the switch has been removed from the active configuration before placing the switch into the service position.

1.Place the switch circuit breaker in the Off (`0') position.

2.Set the inline switch on the power cable to the Off (`0') position.

3.At the rear of the switch, remove the power cable from slot J1 and the supervisor cable from slot J2.

4.Record the positions of all switch cables connected to the interposers in slots J3 through J34.

5.Remove the switch cables.

6.Remove the switch mounting screws from the front of the frame.

7.Remove the switch by sliding it out of the front of the frame.

3-10RS/6000 SP: SP Switch2 Service Guide

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IBM RS/6000 SP manual Fencing nodes, Efence of primary and primary backup nodes
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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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