Managing host systems

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A host system is an IBM® z/OS® or AIX® system that connects to storage systems to enable certain replication features for those systems.

About this task

A connection to a z/OS host system is required if you want to enable z/OS features such as HyperSwap® and hardened freeze in Copy Services Manager sessions. A connection to a z/OS or z/TPF system is required to enable performance features for FlashCopy or Safeguarded Copy solutions.

If Copy Services Manager is installed on the host system, the host system connection is automatically added to Copy Services Manager. This connection is referred to as the native z/OS connection.

If Copy Services Manager is not installed on the host system, you must add the connection to the host system by using an IP connection. To use an IP connection, you must set certain Resource Access Control Facility (RACF®) settings on the z/OS host as described in the IBM Copy Services Manager Installation and Configuration Guide. Equivalent setup is necessary on z/TPF prior to connecting.

You can add z/OS and z/TPF host connections in Copy Services Manager regardless of the operating system on which the application is installed. For example, you can add a connection to a z/OS host system in Copy Services Manager that is running on Windows, Linux®, or AIX.

Note: Every Copy Services Manager release may include an update in the level of Java shipped with the product. It is important to ensure that you z/OS or z/TPF systems are kept up to date with the latest changes in TLS encryption algorithms. Java will deprecate older algorithms which could lead to the z/OS or z/TPF host connection no longer connecting after an upgrade. See the What are the security vulnerabilities in IBM Copy Services Manager page for details on what Java levels ship with which releases.