Multiple IRLMs in sysplex data sharing

Multiple IRLMs can take part in the control of data sharing at the block level when IMS systems are executing in the same z/OS® operating system.

This could be the case when IMS online systems are being tested for their use of data sharing before one of the systems is installed on a second z/OS operating system.

A special case of sysplex data sharing occurs when multiple IRLMs execute on a single z/OS operating system. In this case, you declare global sharing and give each IRLM a unique z/OS subsystem name and an identifying IRLM number (ID).