IBM z/OS manual Parallel Sysplex Cluster Technology, Concurrent Capacity Backup Downgrade CBU Undo

Parallel Sysplex Cluster Technology

•Cryptographic Cards: The PCIXCC and PCICA cards plug in the I/O cage and can be added or replaced con- currently with system operation.

•Redundant Cage Controllers: The Power and Service Control Network features redundant Cage Controllers for Logic and Power control. This design enables nondis- ruptive service to the controllers and virtually eliminates customer scheduled outage.

•Auto-Switchover for Service Element: The z990 has two Service Elements. In the event of failure on the Primary SE, the switchover to the backup is handled automati- cally. There is no need for any intervention by the cus- tomer or Service Representative.

Concurrent Capacity Backup Downgrade (CBU Undo)

This function allows the customer to downgrade the disas- ter backup machine to its normal confi guration without requiring the PowerOn Reset (POR).

Concurrent Memory Upgrade

This function allows adding memory concurrently, up to the maximum amount physically installed.

Parallel Sysplex clustering was designed to bring the power of parallel processing to business-critical zSeries and S/390 applications. A Parallel Sysplex cluster consists of up to 32 z/OS and/or OS/390 images coupled to one or more Coupling Facilities (CFs or ICFs) using high-speed specialized links for communication. The Coupling Facili- ties, at the heart of the Parallel Sysplex cluster, enable high speed, read/write data sharing and resource sharing among all the z/OS and OS/390 images in a cluster. All images are also connected to a Sysplex Timer® to address time synchronization.

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Parallel Sysplex Resource Sharing enables multiple system resources to be managed as a single logical resource shared among all of the images. Some examples of resource sharing include Automatic Tape Switching (ATS star), GRS “star,” and Enhanced Catalog Sharing; all of which provide simplifi ed systems management, increased performance and/or scalability. For more detail, please see S/390 Value of Resource Sharing white paper – GF22-5115 on the Parallel Sysplex home page at ibm.com/servers/ eserver/zseries/pso.

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