Draft Document for Review April 7, 2004 6:15 pm

6947ch03.fm

IOCP. The CHPID assignment associates the CHPID number to a physical channel port location (PCHID).

HiperSockets (IQD) and IC links (ICP) do not have PCHIDs, as they are virtual and not physical links, but they do require CHPID numbers.

The PCIX Cryptographic Coprocessor (PCIXCC) and PCI Cryptographic Accelerator (PCICA) features do not require CHPID numbers but are assigned PCHIDs.

z990 CHIPD Mapping Tool (CMT)

The z990 CHPID Mapping Tool (CMT) is available, and it is highly recommended for PCHID-to-CHPID assignments. For complex configurations and configurations using multiple Logical Channel Subsystems, using the CMT is strongly recommended.

CMT has a manual mapping and availability mapping function, which does the PCHID-to-CHPID assignments for the best availability. For more information about the z990 CMT, see “IBM z990 CHPID Mapping Tool (CMT)” on page 116.

3.4 Connectivity

Input/output (I/O) channels are components of the z990 server Channel Subsystem (CSS). They provide a pipeline through which data is exchanged between processors, or between a processor and external devices or networks. The most common type of device attached to a channel is a control unit (CU). The CU controls I/O devices such as disk and tape drives.

Server-to-server communications are most commonly implemented using Inter-System Channels (ISC-3), Integrated Cluster Bus (ICB4, ICB-3 or ICB-2) links, or channel-to-channel (CTC) connections.

Local Area Network (LAN) connectivity can be done by the OSA Express cards. There are specific OSA Express cards to support Gigabit Ethernet (GbE), 1000BASE-T Ethernet, 100BASE-T Ethernet, 10BASE-T Ethernet and Token Ring networks. For additional, detailed information about z990 connectivity, see the IBM Redbook IBM eServer zSeries Connectivity Handbook, SG24-5444.

3.4.1 I/O and cryptographic features support and configuration rules

Table 3-7 on page 90 summarizes all available I/O and cryptographic features on z990 servers, the maximum number of ports for each type, the number of I/O slots required to achieve this number, and the port increments.

The I/O configuration rules are also provided, including the configuration requirements and limitations.

Chapter 3. I/O system structure

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IBM manual Connectivity, Z990 Chipd Mapping Tool CMT
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990 specifications

The IBM 990 series, often referred to in the context of IBM's pioneering efforts in the realm of mainframe computing, represents a unique chapter in the history of information technology. Introduced in the late 1960s, the IBM 990 series was designed as a powerful tool for enterprise-level data processing and scientific calculations, showcasing the company's commitment to advancing computing capabilities.

One of the main features of the IBM 990 was its architecture, which was built to support a wide range of applications, from business processing to complex scientific computations. The system employed a 32-bit word length, which was advanced for its time, allowing for more flexible and efficient data handling. CPUs in the IBM 990 series supported multiple instructions per cycle, which contributed significantly to the overall efficiency and processing power of the machines.

The technology behind the IBM 990 was also notable for its use of solid-state technology. This provided a shift away from vacuum tube systems that were prevalent in earlier computing systems, enhancing the reliability and longevity of the hardware. The IBM 990 series utilized core memory, which was faster and more reliable than the magnetic drum memory systems that had been standard up to that point.

Another defining characteristic of the IBM 990 was its extensibility. Organizations could configure the machine to suit their specific needs by adding memory, storage, and peripheral devices as required. This modular approach facilitated the growth of systems alongside the technological and operational demands of the business environments they served.

In terms of software, the IBM 990 series was compatible with a variety of operating systems and programming environments, including FORTRAN and COBOL, enabling users to access a broader array of applications. This versatility was a significant advantage, making the IBM 990 an appealing choice for educational institutions, research facilities, and enterprises alike.

Moreover, the IBM 990 was engineered to support multiprocessing, which allowed multiple processes to run simultaneously, further increasing its effectiveness in tackling complex computing tasks.

In summary, the IBM 990 series represents a significant advancement in computing technology during the late 20th century. With a robust architecture, versatile configuration options, and a focus on solid-state technology, the IBM 990 facilitated substantial improvements in data processing capabilities, making it a cornerstone for many businesses and academic institutions of its time. Its impact can still be seen today in the continued evolution of mainframe computing.
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