March 2003
Intermediate to advanced
282 pages
9h 13m
English
book
IMS in the Parallel Sysplex Volume I: Reviewing the IMSplex Technology
by Jouko Jantti, Juan Jesœs Iniesta Mart’nez, Knut Kubein, Bill Stillwell, Gary Wicks
Content preview from IMS in the Parallel Sysplex Volume I: Reviewing the IMSplex Technology
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34 IMS in the Parallel Sysplex, Volume I: Reviewing the IMSplex Technology
2.1 Data sharing overview
The concept of data sharing is not new to IMS. It was first implemented in IMS/VS Version 1
Release 2 to share data between multiple IMS subsystems and two IRLMs in order to
overcome the capacity constraints of the single-processor environments of the day. This
database sharing support also provided a vehicle to create higher availability environments
where the impact of outages caused by component failures, and planned change windows
were minimized to the end user. Because the IRLM that IMS connects to must reside in the
same logical partition, this limited the data sharing environment to two LPARs, therefore the
name two-way data sharing. ...
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