IBM S/390 Coupling Facility 9674 Model C01

April 6, 1994
Announcement Number: 194-082

Document's Table of Contents:


IBM's new Coupling Facility technology, a combination of hardware and software functions, builds on the existing sysplex structure to make high-performance data sharing possible in the new S/390(R) Parallel Sysplex.

This announcement describes the IBM S/390 Coupling Facility 9674. The 9674 is a dedicated Coupling Facility; no operating systems run on it.

Initial Availability Dates:
IBM S/390 Coupling Facility
  Coupling Facility 9674 Model C01              June 1994
  One-way Processor Unit                        June 1994
  Two-way Processor Unit                        June 1994
  Three-way Processor Unit                      June 1994
  Four-way Processor Unit                       June 1994
  Five-way Processor Unit                       June 1994
  Six-way Processor Unit                        June 1994
  Coupling Links (16 Maximum)                   June 1994
  1 Km Coupling Links                           June 1994
  Battery Backup                                June 1994
  Coupling Links (32 Maximum)                   4th Quarter 1994
  3 Km Coupling Links                           4th Quarter 1994
  Power Save State                              4th Quarter 1994
Coupling Facility Upgrades
  One-way to Two-way Central Electronics
    Complex (CEC)                               September 1994
  One-way to Three-way CEC                      September 1994
  One-way to Four-way CEC                       September 1994
  One-way to Five-way CEC                       September 1994
  One-way to Six-way CEC                        September 1994
  Two-way to Three-way CEC                      September 1994
  Two-way to Four-way CEC                       September 1994
  Two-way to Five-way CEC                       September 1994
  Two-way to Six-way CEC                        September 1994
  Three-way to Four-way CEC                     September 1994
  Three-way to Five-way CEC                     September 1994
  Three-way to Six-way CEC                      September 1994
  Four-way to Five-way CEC                      September 1994
  Four-way to Six-way CEC                       September 1994
  Five-way to Six-way CEC                       September 1994
(R)   Registered trademark of International Business Machines
(TM)  Trademark of International Business Machines Corporation
IN BRIEF . . .

| o  S/390 Parallel Sysplex support                                 |
|                                                                   |
| o  The S/390 Parallel Sysplex is a fundamentally new structure    |
|    for enabling parallel processing and data sharing across       |
|    systems.                                                       |
|                                                                   |
| o  High-performance multisystem data sharing with integrity       |
|                                                                   |
| o  High-speed fiber optic cables                                  |
|                                                                   |
| o  Highly available, fault-tolerant functions and configurations  |
|                                                                   |
| o  Hot plugging of high-speed links to minimize planned outages   |
|                                                                   |
| o  Power save feature to hold data after a utility power failure  |
|                                                                   |
| o  Up to 32 MVS/ESA images with data sharing                      |
|                                                                   |
| o  Large number of configurations possible to match varying user  |
|    requirements                                                   |
|                                                                   |
| o  Test and migration vehicle without new hardware cost           |

Data Sharing Capability

The new coupling technology facilitates data sharing without partitioning data between multiple systems, allowing nondisruptive incremental growth. Use of the Coupling Facility by software subsystems, like CICS(TM) or IMS, ensures the integrity and consistency of data throughout the Parallel Sysplex. In addition, workloads can be dynamically balanced across systems with the help of the MVS workload manager and subsystems using the Coupling Facility.

Multisystem data sharing results in greater capacity against a single large database than previous single-image systems. The data does not need to be partitioned or repartitioned to add another system; the data is accessible to all systems.

The new coupling technology allows up to 32 MVS/ESA images to concurrently access the same data. This allows for easier and more flexible growth without splitting data and applications across multiple single-image systems. Total systems capacity can be increased with cost-competitive increments to meet virtually any level of business volume or application growth.

Coupling Links are used to connect the Coupling Facility to coupling-capable systems. The connections are made with new high-speed fiber optic cables used for data and message traffic between the Coupling Facility and MVS/ESA images.

The 9674 Coupling Facility with Coupling Links can support multiple MVS/ESA images running in Logical Partitions on the same 9021 711-based processor, 9121 511-based processor, or S/390 Parallel Transaction Server 9672 processor, or MVS/ESA images running on multiple coupling-capable processors.

Continuous Availability

The new coupling technology provides more flexibility for meeting availability requirements. Systems can be configured to reduce single points of failure to reduce the occurrence of both scheduled and unscheduled outages. The new Parallel Sysplex will reduce the impact of losing one system.

With the new coupling technology, high levels of availability can be configured. The cost of real continuous availability, compared to standby backup systems, will be considerably lower. The options for making trade-offs between cost and availability have increased. Availability is delivered by the new Parallel Sysplex and not by a single MVS/ESA image within the sysplex.

Multiple Coupling Facilities can be used to connect to each MVS/ESA system. This provides considerable flexibility to configure shared data systems that are fault tolerant. When configured with multiple Coupling Facilities, scheduled outages to the Coupling Facility are fully transparent to the end user and unscheduled outages are reduced or transparent to the end user.

Multiple Coupling Links can be connected to each MVS/ESA system. This increases availability by eliminating a single point of failure.

Coupling-capable systems running MVS/ESA can be added or removed dynamically from the Coupling Facility. The Coupling Facility, configured correctly at installation, will allow Coupling Links to be hot plugged later, allowing horizontal growth without disruption.

The Coupling Facility has N+1 power capable of supporting a CEC for most power supply failures without interrupting system operation. Also, the Coupling Facility has a power backup capability that provides power to run the CEC for a short period of time. In addition, the Coupling Facility has a "power save state," which keeps only the memory active, and an external DC power connection to minimize risk of extended power outages.

Storage background scrubbing reduces system failure due to accumulation of multiple storage errors. The system continually scrubs the arrays for soft errors, makes corrections to these errors, and records information about hard errors.

Protection of Investments in S/390

The new coupling technology protects investments in S/390. The Coupling Facility attaches to the current 9021 711-based processors and 9121 511-based processors, providing horizontal growth. It can attach up to 32 MVS/ESA images, including the new S/390 Parallel Transaction Server 9672 processors.

Coupling Links use fiber optic cables that offer installation management and systems management benefits similar to those provided by ESCON(R) channels with regard to cable size, weight, and cost. The Coupling Links are Fiber Channel Standard (FCS) level 0 compliant.

When attached with high-speed links to coupling-capable processors running MVS/ESA 5.1 and proper levels of subsystems, the Coupling Facility provides a coupled systems environment that will run existing transaction processing applications with minimal or no changes while getting all the benefit of parallel processing.


The following publications reflect this product and will be available within 30 days:

Title                                              Order Number

Installation Manual -- Physical Planning GC22-7101

System Overview GA22-7148

PR/SM Planning Guide GA22-7123

The following publications reflect this product and are shipped with the product:
Title                                              Order Number

Managing Your Processor GC38-0452

PR/SM Planning Guide GA22-7123

Hardware Management Console Guide GC38-0453

Operations Guide GC38-0454

IOCP User's Guide GC38-0401

Standalone IOCP User's Guide GC38-0455

Hardware Management Console Application Programming Interfaces SC28-8141

Problem Analysis (PA) Guide SY22-9862

Hardware Management Console Tutorial SK2T-1196

The System Library Subscription Service (SLSS) is available by product number and subject code. If you currently subscribe to SLSS, publication updates will be delivered automatically.

Displayable Softcopy Publications

Publications are offered in displayable softcopy form. The displayable publications are shipped with the feature, in addition to the hardcopy publications. The files are available on a CD-ROM.

These displayable manuals can be used with the BookManager(R) READ licensed programs in any of the supported environments. Terms and conditions for use of the machine-readable files are shipped with the files.


Specified Operating Environment

The environmentals listed include a fully populated CEC cage with a six-way CEC, maximum memory, and Coupling Links. The Input/Output (I/O) Expansion adds a fully populated feature #1000 Expansion Cage.

 Weight                                     450 kg (990 lb)
 Foot Print                                 1.0 sq m (10.4 sq ft)
 Service Clearance                          4.0 sq m (43.1 sq ft)
 Input Power without I/O Expansion          1.4 kVA
 Input Power with I/O Expansion             2.0 kVA
 Heat Output without I/O Expansion          1.36 kW (4.6 kBTU/hr)
 Heat Output with I/O Expansion             1.96 kW (6.6 kBTU/hr)
 Acoustics                                  6.9 bels
Hardware Requirements: The Coupling Facility is only one component of the new coupling technology being announced. The coupling technology includes the Coupling Facility connected to coupling-capable processors with Coupling Links (high-speed links). The coupling-capable processors run MVS/ESA Version 5 Release 1 together with subsystems that exploit coupling services.

ESCON I/O and the interconnect technologies are recommended in the Parallel Sysplex for increased connectivity and access to large amounts of data. In addition, they offer improved availability.

The entry configuration and optional features for the Coupling Facility 9674 Model C01 shipped or upgraded from the plant follow.

The entry configuration is a one-way CEC with 128MB of memory, two Coupling Links (either type), and a console.

Central Electronics Complex (CEC): The Coupling Facility contains one processor card which is upgradeable.

Upgrades are available by replacing the processor unit with one containing more processors. The removed part becomes the property of IBM and must be returned. Hardware Management Console: The 9674 console is the single control point for the Coupling Facility, through commands issued via local area network (LAN) communications. It provides functions through a new object-oriented design, which allows the customer to directly manipulate the objects that make up the system and be aware of changes to the system status immediately. A single hardware management console can support the 9674 Coupling Facility and/or the S/390 Parallel Transaction Server processors attached to the same hardware management console LAN.

Up to four consoles can be attached to the Coupling Facility. The additional consoles can be used for backup or if a second console is required in another location.

The LAN is dedicated, not shared. A 28-foot token-ring patch cable is shipped with the Coupling Facility to attach the first hardware system console. Consoles can be located according to the LAN distance restrictions described in the System Overview document (GA22-7148).

Central Storage: The Coupling Facility requires two equally sized storage cards to be plugged at all times. All storage upgrades require removal of the two existing storage cards and installation of two new storage cards. All removed storage cards become the property of IBM and must be returned to IBM.

Coupling Links: The 9674 Coupling Links connect the Coupling Facility to the 9021 711-based processors, 9121 511-based processors, and S/390 Parallel Transaction Server 9672 processors. The Links come in two types and must match at both the Coupling Facility end and the attached processor end.

In the Coupling Facility one Intersystem Channel Adapter (#0014) is required for every two Coupling Links (#0007 or #0008). The Intersystem Channel Adapter is not hot pluggable, but the Coupling Links are. Additional Intersystem Channel Adapters and Coupling Links can be ordered to reduce outages. For details on hot plugging, refer to the System Overview document (GA22-7148). Two types of Coupling Links are available:

Expansion Cage: The Expansion Cage allows for the addition of more Coupling Links. It fits into the same frame as the Coupling Facility. Note: Single phase power is required for the 9674 unless you install Expansion Cage #2000, which requires three phase power. IBM recommends installing a three phase feed for the 9674. This suggestion is based on the high probability that future system upgrades will utilize three phase power.

Battery Backup (#2011): Uses internal batteries to provide power during a power outage. The batteries will last up to 3.5 minutes while the Coupling Facility continues to run. In the power save state, Coupling Facility function is suspended but the internal batteries preserve Coupling Facility memory for up to 80 minutes. The power save state will be available fourth quarter 1994.

Note: If an uninterrupted power supply (UPS) is installed that supplies power to the Coupling Facility during power failures, the battery backup feature would not be needed but would be recommended.

In addition, the battery backup feature provides an external 24 volt DC supply connection. EXIDE Electronic has developed an Auxiliary DC Power Module (ADMOD) that can attach to the external 24 volt DC supply provided by the battery backup feature. The ADMOD extends the battery backup capability up to 48 hours. Your IBM representative can refer to the availability package on Market Tools for more details on ADMOD.

The 9674 comes with Graphic Gray side covers and Black front and back covers. Other colors will be handled by the RPQ process.

Software Requirements: There are no programming requirements for the Coupling Facility. The Coupling Facility communicates with the MVS/ESA images and subsystems running on attached 9021 711-based processors, 9121 511-based processors, and S/390 Parallel Transaction Server 9672 processors.

MVS/ESA Version 5 Release 1 is required on the coupling-capable processors attached to a Coupling Facility, together with the proper levels of subsystems that exploit the Coupling Facility. These subsystems include:

IBM intends to enhance DB2(R) to provide full data sharing in the future.

Compatibility: The Coupling Facility functions provided in the 9674 Coupling Facility are available on a S/390 Parallel Transaction Server 9672 processor with one or more CECs running the coupling facility control code (CFCC) or 9021 711-based processors with SEC 228270 with a processor logically partitioned to run CFCC. The 9121 511-based processors support only the Integrated Coupling Migration Facility (ICMF).

The ICMF provides the CFCC functions without Coupling Links. It is intended only for migration and testing of software needed for coupling systems and is limited to MVS/ESA images running on a single physical system image. ICMF runs on the 9021 711-based processors, 9121 511-based processors, and S/390 Parallel Transaction Server 9672, but not on a 9674 Coupling Facility.

Coupling Link hardware is used to connect all coupling-capable S/390 processors to the Coupling Facility. The Coupling Links are high-bandwidth fiber optic cables connected point-to-point between the Coupling Facility and all coupling-capable S/390 processors. The Coupling Links are not ESCON channels. The Coupling Links are described in this announcement and in all the coupling-capable S/390 processor announcements.

The coupling-capable S/390 processors include 9021 711-based processors, 9121 511-based processors, and the S/390 Parallel Transaction Server 9672.

Sysplex Timer(R) facilities are required to synchronize time-of-day (TOD) clocks if multiple processors are coupled in the new Parallel Sysplex. This does not apply to the Coupling Facility itself. The Sysplex Timer can be located up to 3 km from any of the coupled systems.

For highest availability and best performance, two Coupling Facilities are recommended. Each Coupling Facility would be linked to all the coupling-capable processors in the sysplex. If one Coupling Facility would fail, the other Coupling Facility would recover its work and keep running.

The Hardware Management Console provides a single point of control for the Coupling Facility. One Hardware Management Console can control both a customer's 9674 Coupling Facility and the Parallel Transaction Server 9672 processors. The Hardware Management Console Application provides automatic identification of hardware elements it can manage, customer grouping support, aggregated and individual real-time system status via colors, consolidated hardware message support, consolidated operating system message support, consolidated service support, and hardware commands targeted at a single system, multiple systems, or a customer group of systems.

Target System Control Facility (TSCF), an MVS-based and NetView(R)-based operations management product, provides centralized, enterprise-wide monitoring and control of the S/390 Parallel Transaction Server 9672, the S/390 Coupling Facility 9674, and other S/390 processors. The Hardware Management Console is still required with TSCF on the S/390 Parallel Transaction Server 9672 and S/390 Coupling Facility 9674. Additional information on TSCF support is available in the TSCF Planning and Installation manual (GC28-1063).

Planning Information

Customer Responsibilities: Site preparation for the Coupling Facility is the responsibility of the customer. Information regarding space, power, cooling, and customer-supplied cables can be found in the Installation Manual -- Physical Planning (GC22-7101).

For Coupling Facility planning purposes, tools will be provided to assess the customer's Coupling Facility requirements. The tools will address the storage and access rate requirements.

For Coupling Facility tuning purposes, the new RMF reports available in RMF 5.1.0 provide information regarding storage actually used and access rates for each Coupling Facility.

Contact your IBM representative for performance and technical planning assistance.

Cable Orders: The above manual also contains details on customer-supplied cables as well as cables to be ordered from IBM, including jumper cables used for Coupling Link cable connectors. Cable length restrictions are also detailed in this publication for the Coupling Facility. Cable ordering information can be found in the S/390 Coupling Facility 9674 Sales Manual.

Installability: The Coupling Facility Model C01 has an approximate system installation time of 4 to 6 hours.

The approximate field model upgrade times are as follows:

These times assume prerequisite engineering changes (ECs) and MESs are installed prior to the feature upgrade.

This IBM equipment is subject to the applicable rules and regulations of the United States Federal Communications Commission (FCC). This equipment will comply with the applicable rules and regulations of the FCC before final delivery to the customer.

Contact the local IBM representative for specific installation times on field upgrades of particular models and configurations.

Security, Auditability and Control

The IBM S/390 Coupling Facility maintains a high level of data integrity and security.

Reliability, Availability, Serviceability

The 9674 Coupling Facility includes function to improve reliability, availability, and serviceability characteristics:

User management is responsible for evaluation, selection, and implementation of security features, administrative procedures, and appropriate controls in application systems and communication facilities.


Volume Discount: Volume purchasing is not available under the Volume Discounts section of the IBM Customer Agreement.

IBM Credit Corporation Financing: ICC will provide financing alternatives for the S/390 Coupling Facility 9674. This financing is available to commercial and state and local government customers.

Warranty Period: One year

Warranty Service: IBM On-Site Repair (IOR)

Maintenance Service: IOR

Satisfaction Guarantee: To translate the quality of the IBM S/390 Coupling Facility into a stronger commitment to our customers, IBM is offering the following Satisfaction Guarantee.

If you, the original user of an installed IBM S/390 Coupling Facility or feature upgrade, are dissatisfied with its quality or reliability, IBM will replace your equipment with the same machine model or feature upgrade, when requested in writing by you within one year of its initial installation date. The replaced equipment must be transferred to IBM with clear title, free of liens and encumbrances, and in an unaltered condition. This guarantee applies only in the country of purchase, does not apply to replacement equipment, and does not cover damage caused by alterations, misuse, accident, unsuitable physical or operating environment, improper maintenance, or improper installation by a third party.

IBM may change the terms of this guarantee at any time. However, any change would not be retroactive.

IBM Hourly Service Rate Classification: Three. IBM warranty service, maintenance service, or hourly service may be obtained by calling 800-IBM-SERV (426-7378). IBM hourly service is available at the applicable rate and terms, including element exchange price if applicable.

Mid-Range System Option: This product is eligible for the Mid-Range System Option of the IBM Customer Agreement. A revised exhibit will be available at a later date.

            Three-Year        Five-Year

9674 12% 17%

Corporate Service Option: The S/390 Coupling Facility 9674 is eligible for the Corporate Service Option of the IBM Customer Agreement. A revised exhibit will be available at a later date.
            Three-Year        Five-Year

System 14% 19%

Extended Maintenance Option: This product is an eligible machine under the Extended Maintenance Option of the IBM Customer Agreement.

Product Availability Status: New product available

Field-Installable Features: Yes

Model Conversions: No

Customer Setup: No

Licensed Internal Code: Yes

Educational Allowance: A special price is available to qualified educational institutions. Prices are available upon request from your IBM representative.


Prices and maintenance charges for the 9674 Model C01 and the associated features are available upon request from an IBM representative.


Description                 Machine Type             Model

Coupling Facility 9674 C01

Model C01 Features -- Chargeable

Description                             Number

Hardware Management Console: PS/2(R) Console with RSF 0009 17" Console Display 6090 21" Console Display 6091

CEC Options: 1-way Processor Card 0001 + 2-way Processor Card 0002 + 3-way Processor Card 0003 + 4-way Processor Card 0004 + 5-way Processor Card 0005 + 6-way Processor Card 0006 +

Central Storage Options: 64MB Memory Card 0064 + 128MB Memory Card 0128 + 256MB Memory Card 0256 + 512MB Memory Card 0512 + 1GB Memory Card 1024 +

Coupling Links: Intersystem Channel Adapter 0014 Coupling Link (1 km multi-mode) 0007 Coupling Link (3 km single-mode) 0008

Cages: Expansion Cage (Maximum Coupling Links = 16) 1000 Expansion Cage (Maximum Coupling Links = 32) 2000

Battery Backup 2011

Model C01 Features -- No Charge

Description                             Number

Cages: Processor Cage 0010

Airflow: CEC Airflow Card 0012 Link Airflow Card 0013

Frame Power Cables: 1.8 Meter U.S., Chicago Watertight 9986 4.8 Meter U.S., Non- Chicago Watertight 9987 4.8 Meter Non-U.S., (connector-less) 9988

+     If field installed on a purchased machine, parts removed or
      replaced become the property of IBM and must be returned.
Note: Two equally sized memory cards are plugged at all times. All storage upgrades require removal of the two existing cards and installation of two new memory cards.